Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. 
Astronomers have for the first time definitively ID’d the birth of a specific heavy element during a neutron-star smashup. They found strontium. And it showed up in the wavelengths of light — or spectra — making up this collision’s afterglow.
Scientists had assumed that a collision by two super-dense objects, such as neutron stars, would trigger a chain of nuclear reactions. They’re known as the r-process. In such an environment, the nuclei of atoms could rapidly gobble up neutrons. Afterward, those nuclei would become transformed in a process known as radioactive decay. The r-process was seen as a way to transform old, smaller elements into newer, bigger ones. About half of all elements heavier than iron were thought to be made in the r-process. Finding strontium in the recent collision at last offered the most direct evidence yet that neutron-star collisions really do trigger the r-process.
Physicists had long predicted that silver, gold and many other elements more massive than iron formed this way. But scientists weren’t sure where those r-process reactions took place. After all, no one had directly seen the r-process underway in a celestial event. Or they didn’t until the merger of two neutron stars in 2017. Scientists quickly analyzed light given off by that cataclysm. In it, they found evidence of the birth of a hodgepodge of heavy elements. All would seem to have come from the r-process. 
The researchers were examining mostly very heavy elements — ones whose complex atomic structures can generate millions of spectral features. And all of those features were not yet fully known, Watson points out. This made it extremely difficult to tease apart which elements were present, he says.
Strontium, however, is relatively light compared to other r-process elements. And its simple atomic structure creates a few strong and well-known spectral clues. So Watson and his colleagues expanded their analysis to consider it. In doing so, they turned up the clear "fingerprint" of strontium. It emerged in light collected by the Very Large Telescope in Chile within a few days of the neutron-star collision. Seeing strontium in the afterglow wasn’t all that unexpected, says Brian Metzger. He’s an astrophysicist at Columbia University in New York City and not involved in the new work. Strontium, he notes, “does tell us something interesting” about the elements formed during the neutron-star collision.

Which of the following statements is TRUE, according to the passage?

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Bitcoins are a form of virtual currency. In other words, they are a type of money that does not exist in the actual world. However, they can be used to purchase actual products and services from real companies.
The bitcoin system was created in 2009 by an enigmatic person named Satoshi Nakamoto. In fact, no one is sure if Satoshi Nakamoto is an actual person or a group of people. Bitcoins are designed to serve as an alternative to national currencies, such as dollars and euros, They can be used to pay for things instead of cash or credit cards. When bitcoins are transferred from a buyer to a seller, the transaction is recorded in a public database.
Governments are concerned that bitcoins can easily be stolen by hackers. It has dawned on them that they might be used for illegal purposes. For example, stolen goods could be purchased without the government's knowledge. Although more and more companies are beginning to accept bitcoins, the percentage of purchases made using bitcoins is minuscule compared to other online payment methods, such as credit cards. Instead, many bitcoin owners simply keep them as an investment since more valuable in the future.
This may or may not be a wise approach. Currently, the value of bitcoins is fluctuating wildly, especially when compared to highly stable national currencies, Bitcoin Investors are gambling on the hope that as this high-tech money becomes more widely accepted, its value will soar.

What is the passage mainly about?

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question. 
Australia has a well-organized and well-structured education system. The education starts at the age of five or six, but it may differ by a narrow margin between states. It starts with the preschool education which is not compulsory and can be offered within a school or separately. The primary and secondary school encompasses the compulsory education for Australians. There are a large number of primary and high school across the country with most of them being public schools. It is estimated that public schools amount to 60% of scholars as opposed to 40% in private settings. All these education providers must be licensed by the government and must fulfill certain requirements including infrastructure and teaching. Universities, on the other hand, are mainly public institutions.
The Australian education system has established a standard curriculum so all scholars will be given the same quality of education. Despite there may be some states at which this curriculum is modified a bit, but the change is not that significant. The actual curriculum set out in Australia education system is based on important abilities one must have in his life: Literacy, Numeracy, Information and communication technology, Critical and creative thinking, personal and social capability, ethical understanding, intercultural understanding.
Vocational and Technical schools prepare students that want to skip the university and want to move directly to the job market. Actually, here it stands the difference between universities and colleges: the Vocational and Technical Schools are more oriented in teaching practical skills while university courses are mainly theory-based to lead students to different academic careers. There are hundreds of other schools out there that provide technical and further education (TAFE) and vocational education and training (VET). These schools offer short courses, certificates I through IV, diplomas, and advanced diplomas. They focus on training their students in a particular vocation or just to help their students get out into the workplace. These schools offer a wide variety of courses and qualifications attained by these courses can lead to different career pathways to follow afterward.
Australian higher education modernity and reputation relies on a huge number of educational providers including universities and different training organizations. Currently, there are 43 universities across the country. The vast majority of universities are public except two private universities. The world-class teaching offered is surely undisputed. Seven Australian universities are traditionally found at the top 100 best universities in the world which is a sufficient indicator to highlight their quality.
Besides universities, more than 5,000 training organizations are registered and accredited. Actual figures show that the number of enrolled students is around 3.8 million with international students sharing more than half a million. There are also 3 self-accrediting higher education institutions. Furthermore, dozens of smaller schools do not grant any degrees or have an accreditation – these are private schools that focus on theology, business, information technology, natural therapies, hospitality, health, law, and accounting.

According to paragraph 3, the main difference between universities and Vocational and Technical schools is that _______________.

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Advertising helps people recognize a particular brand, persuades them tro try it, and tries to keep them loyal to it. Brand loyalty is perhaps the most important goal of consumer advertising. Whether they produce cars, canned foods or cosmetics, manufacturers want their customers to make repeated purchases. The quality of the product will encourage this, of course, but so, too, will affect advertising.
Advertising relies on the techniques of market research to identify potential users of a product. Are they homemakers or professional people? Are they young or old? Are they city dwellers or country dwellers? Such questions have a bearing on where and when ads should be played. By studying readership breakdowns for newspapers and magazines as well as television ratings and other statistics, an advertising agency can decide on the best way of reaching potential buyers. Detailed research and marketing expertise are essential today when advertising budgets can run into thousands of millions of dollars.
Advertising is a fast-paced, high-pressure industry. There is a constant need for creative ideas that will establish a personality for a product in the public’s mind. Current developments in advertising increase the need for talented workers.
In the past, the majority of advertising was aimed at the traditional white family – breadwinner father, non- working mother, and two children. Research now reveals that only about 6 percent of American households fit this stereotype. Instead, society is fragmented into many groups, with working mothers, single people and older people on the rise. To be most successful, advertising must identify a particular segment and aim its message toward that group.
Advertising is also making use of new technologies. Computer graphics are used to grab the attention of consumers and to help them see products in a new light. The use of computer graphics in a commercial for canned goods, for instance, gave a new image to the tin can.

According to paragraph 2, market research inclues     .

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Dolphins are one of the most intelligent species on the planet, which makes them a very interesting animal to scientists. In their natural habitats, dolphins use various vocalization techniques. They whistle and squeak to recognize members of their pod, identify and protect their young, and call out warnings of danger. They also make clicking sounds used for echolocation to find food and obstacles in dark and murky waters.
Amazingly, the whistling sound that the bottlenose dolphin makes has been found to have a similar pattern to human language. They always make conversational sounds when they greet each other. If you listen to dolphins' squeaks and squeals, it will sound like they are having a conversation.
Dolphins usually use both sound and body language to communicate with each other. It is through gesture and body language, however, that most of their communication with humans comes. Dolphins can be trained to perform complicated tricks. This suggests they have a high level of intelligence and communication capacity. If they work for a long time with a trainer, they are able to recognize and understand human commands.
A lot of dolphin communication has been studied using dolphins in captive environments. These studies have been criticized because some marine biologists believe that dolphins living in aquariums or research centers cannot be considered "normal." Even so, most believe that studying dolphin communication in captivity is useful for beginning to understand the complexity of dolphin communication. After all, dolphins are one of the most intelligent animals. Their ability to communicate is impressive and worthy of study.

What would be the most suitable title for the passage?

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Oxford University scientists have launched an attempt to bring the Northern White Rhinoceros back from beyond the “point of no return” using IVF (In Vitro Fertilization). The team believes a pioneering treatment can prompt a revival of the persecuted species, despite the death last year of the last known male and the fact that the two remaining females, Najin and Fatu, cannot have calves.
One of two subspecies of White Rhinoceros, the Northern Rhinoceros once ranged over tracts of Uganda, Sudan, Central African Republic and the Democratic Republic of Congo. However, the value of its horns saw it poached from a population of approximately 500 to 15 in the 1970s and 1980s. A small recovery – numbers reached 32 – from the early 1990s was then reversed from 2003 when illegal hunting intensified again.
The Oxford researchers believe that it will be possible to remove ovarian tissue from the animals and stimulate it to produce eggs, which would then be fertilised from sperm preserved from male Northern White Rhinoceros. The embryos would then be implanted into a surrogate mother of a similar species, probably a Southern White Rhinoceros. The technique has been used successfully in mice for nearly two decades; it has also been accomplished for some species of dog, horse and cat. However, it has never been attempted before on a rhinoceros, meaning the Oxford team plan to perfect it first by conducting a series of trials on ovarian tissue taken from a Southern White Rhinoceros.
In principal, the benefit of removing ovarian tissue for use in the lab is that it can go on producing eggs. Other researchers are exploring the possibility of using the remaining Northern White Rhinoceros sperm to cross–breed with Southern White Rhinoceros, however Dr Williams believes the focus should be on preserving the identity of the northern species. “This will be a huge buffer against disease and ill health in the long–term, and give the new herds better genetic ability to adapt to changing environments in the future.”
Najin was born in captivity in 1989 and Fatu in 2000. They both belong to the Cvur Kralove Zoo in the Czech Republic, which shipped them to the Ol Pejeta Conservancy in Kenya in 2009 amid tight security. In place of their horns, keepers have fitted radio transmitters to allow close monitoring of their whereabouts in the large paddock areas. The team has enough funding for three years’ research, donated from Fondation Hoffman, however Oxford University has launched a public appeal to raise the money to secure the project long term.

Which of the following statement is TRUE according to the passage?

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question. 
According to The Official Guide to the Quidditch World Cup – produced by the International Confederation of Wizards Quidditch Committee (ICWQC) and available through all reputable wizarding bookstores for what many feel is the ridiculously overpriced sum of thirty nine Galleons – the tournament has been held every four years since 1473. As with so much else about the wizarding world’s most important sporting competition, many query the accuracy of this statement.
As only European teams competed during the fifteenth and sixteenth centuries, purists prefer to date the Quidditch World Cup’s inception from the seventeenth century when it became open to all continents. There is also heated debate about the accuracy of some historical accounts of tournaments. A substantial amount of all post-game analysis centres on whether magical interference took place and whether it made, or ought to have made, the final result moot.
The ICWQC has the unlucky job of regulating this contentious and anarchic competition. The rulebook concerning both on- and off-pitch magic is alleged to stretch to nineteen volumes and to include such rules as “no dragon is to be introduced into the stadium for any purpose including, but not limited to, team mascot, coach or cup warmer” and “modification of any part of the referee’s body, whether or not he or she has requested such modification, will lead to a lifetime ban from the tournament and possibly imprisonment.”
A source of vehement disagreements, a security risk for all who attend it and a frequent focus for unrest and protest, the Quidditch World Cup is simultaneously the most exhilarating sporting event on Earth and a logistical nightmare for the host nation.

Which best serves as the title for the passage?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. 
THE RISE OF OLDER CITIES
        Many older cities are having modern makeovers and they are being given a new (1) ______. Sometimes the impetus for this type of change comes from the need to provide new facilities for particular events being held in the city - a sporting event, or something similar. On other occasions the change just seems to take place almost naturally. 
        Take Birmingham, for instance, (2) ________ it was previously an unfashionable place to live, it has now become trendy, and this change has been brought about largely by the new-look architecture that can be found everywhere in the city. The old shopping centre has been knocked down and completely rebuilt, and new shopping malls are (3) ________ to attract shoppers with the high quality of their services and goods. The area located around the canal, once hidden away and surrounded by decaying factories was often used as a rubbish tip, but it has now become a trendy place made up of modern offices, bars, sought-after apartments and restaurants. To (4)_________ up, Birmingham has become the place to be. Even in what was formerly the poorest part of the city an old factory has been converted into a lively complex of studios, galleries and coffee bars. With its theatres, museums and football teams Birmingham is (5) _______ worth visiting and has something for everyone. 

(3)....................

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The tourist looking at the African savannah on a summer afternoon might be excused for thinking that the wide yellow grass plain was completely deserted of life, almost a desert. With only a few small thorn trees sticking out through the veldt, there seems to be almost no place for a living creature to hide.
However, under those trees you might find small steenbok, sleeping in the shade, and waiting for the night to fall. There may even be a small group of lions somewhere, their bodies exactly the same shade as the tall grass around them. In the holes in the ground a host of tiny creatures, from rabbits and badgers to rats and' snakes are waiting for the heat to finish.
The tall grass also hides the fact that there may be a small stream running across the middle of the plain. One clue that there may be water here is the sight of a majestic Marshall eagle circling slowly over the grassland. When he drops, he may come up with a small fish, or maybe a grass snake that has been waiting at the edge of a pool in the hope of catching a frog.
The best time to see the animals then, is in the evening, just as the sun is setting. The best time of the year to come is in late September, or early August, just before the rains. Then the animals
must come to the waterholes, as there is no other place for them to drink. And they like to come while it is still light; so they can see if any dangers are creeping up on them.
So it is at sunset, and after the night falls, that the creatures of the African veld rise and go about their business.

What kind of book does the text seem to be from?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. 
      Tattooing has been around for thousands of years. The act of making a permanent design or mark on the body was originally thought to (1) ______________ magical protection against disease and misfortune. Later, it was used to show a person's social status. The Romans, for example, used to tattoo slaves and criminals.
       With the arrival of Christianity in Europe, tattooing was forbidden. It virtually died out for hundreds of years, until European explorers came into (2) ________ with American Indians and Polynesians in the 17th and 18th centuries. Sailors would return from long voyage, decorated with large and elaborate designs. Many of these sailors later joined circuses, and earned a living by showing their tattoos to the public. 
       Nowadays, tattooing is neither as unusual, nor as popular as it once was. Tattoo parlors do exist, but most people are unwilling to go (3) ____________ the rather painful procedure. On the other hand, temporary tattoos are becoming increasingly common. The design, (4)_______lasts for three to six weeks, is painted painlessly onto the skin.
       Other people still prefer the (5) _________, permanent techniques, of course. The world record for the most-tattooed person is held by Tom Leppard from Scotland. His leopard-skin design covers 99.2% of his body surface! 

(1).....................

He only read for short periods each day_________. 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions:
WWF, in full World Wide Fund for Nature, international organization committed to conservation of the environment. In North America, it is called the World Wildlife Fund.
In 1960, a group of British naturalists - most notably biologist Sir Julian Huxley, artist and conservationist Peter Scott, and ornithologists Guy Montfort and Max Nicholson - led an effort to establish an organization that protected endangered species and their habitats. The following year the World Wildlife Fund was founded; the international name was subsequently changed to World Wide Fund for Nature in 1989, although in the United States and Canada it retained the founding name. The organization's distinctive panda logo was created by Scott. In the face of growing environmental threats over the ensuing years, the WWF's activities expanded in scope. Today its mission statement is threefold: to conserve the world's biological diversity, to ensure that the use of renewable natural resources is sustainable, and to promote the reduction of pollution and of wasteful consumption.  The  organization has long included both conservationists and businesspeople with the intention of combining solid scientific data with well-managed action. It also seeks cooperation between nongovernmental organizations, local governments, and local populations. The WWF works closely with the World Conservation Union and has formed partnerships with the United Nations, the World Bank, and the European Union.
The WWF provides money for conservation initiatives around the world. These  include  programs focused on individual species, forests, and freshwater and marine issues as well as climate change and responsible international trade. The group has also been involved in  efforts  to provide a safe and sustainable habitat for the world's peoples, both urban and rural, including clean water, clean air, healthful food, and rewarding recreation areas. Among the WWF's notable achievements is its use of debt-for-nature swaps, in which an organization buys some of a country's foreign debt at  a discount, converts the money to local currency, and then uses it to finance conservation efforts. The WWF's first successful debt-for-nature swap took place in 1987 in Ecuador.
At the beginning of the 21st century, the WWF was active in more than 100 countries and had more than five million supporters. The organization's international headquarters are in Gland, Switz., and it has more than 90 offices around the world.

What does the passage mainly discuss?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
Where one stage of child development has been left out, or not sufficiently experienced, the child may have to go back and capture the experience of it. A good home makes this possible
- for example, by providing the opportunity for the child to play with a clockwork car or toy railway train up to any age if he still needs to do so. This principle, in fact, underlies all psychological treatment of children in difficulties with their development, and is the basic of work in child clinics.
The beginnings of discipline are in the nursery. Even the youngest baby is taught by gradual stages to wait for food, to sleep and wake at regular intervals and so on. If the child feels the world around him is a warm and friendly one, he slowly accepts its rhythm and accustoms himself to conforming to its demands. Learning to wait for things, particularly for food, is a very important element in upbringing, and is achieved successfully only if too great demands are not made before the child can understand them. Every parent watches eagerly the child's acquisition of each new skill: the first spoken words, the first independent steps, or the beginning of reading and writing. It is often tempting to hurry the child beyond his natural learning rate, but this can set up dangerous feelings of failure and states of anxiety in the child. This might happen at any stage. A baby might be forced to use a toilet too early, a young child might be encouraged to learn to read before he knows the meaning of the words he reads. On the other hand, though, if a child is left alone too much, or without any learning opportunities, he loses his natural zest for life and his desire to find out new things for himself.
Learning together is a fruitful source of relationship between children and parents. By playing together, parents learn more about their children and children learn more from their parents. Toys and games which both parents and children can share are an important means of achieving this co-operation. Building-block toys, jigsaw puzzles and crosswords are good examples.
Parents vary greatly in their degree of strictness or indulgence towards their children. Some may be especially strict in money matters; others are severe over times of coming home at night, punctuality for meals or personal cleanliness. In general, the controls imposed represent the needs of the parents and the values of the community as much as the child's own happiness and well-being.
With regard to the development of moral standards in the growing child, consistency is very important in parental teaching. To forbid a thing one day and excuse it the next is no foundation for morality. Also, parents should realize that“Example is better than precept”. If they are hypocritical and do not practice what they preach, their children may grow confused and emotionally insecure when they grow old enough to think for themselves, and realize they have been, to some extent, deceived. A sudden awareness of a marked difference between their parents' ethics and their morals can be a dangerous disillusion.

In the 1st  paragraph, the author lays some emphasis on the role of     helping the child in trouble.

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A letter of application is a sales letter in which you are both salesperson and product, for the purpose of an application is to attract an employer’s attention and persuade him or her to grant you an interview. To do this, the letter presents what you can offer the employer, rather than what you want from the job.
Like a resume, the letter of application is a sample of your work and an opportunity to demonstrate your skills and personality. If it is written with flair and understanding and prepared with prefessional care, it is likely to be very effective. While the resume must be factual, objective, and brief, the letter is your chance to interpret and expand. It should state explicitly how your background relates to the specific job, and it should emphasise your strongest and most relevant characteristics. The letter should demonstrate that you know both yourself and the company.
The letter of application must communicate your ambition and enthusiasm. Yet it must be modest. It should be neither aggressive nor compliant: neither pat yourself on the back nor ask for sympathy. It should never express dissatisfaction with the present or former job or employer. And you should avoid discussing your reasons for leaving your last job.
Finally, it is best that you not broach the subject on salary. Indeed, even if a job advertisement requires that you mention your salary requirements, it is advisable simply to call them “negotiable.” However, when you go on an interview, you should be prepared to mention a salary range. For this reason, you should investigate both your field and, if possible, the particular company. You don’t want to ask for less than you deserve or more than is reasonable.

According to paragraph 4, in a job interview, the applicant should be ready to     .

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks. 
Cultural beliefs differ as to whether directness or indirectness is considered positive. In the mainstream American culture, the ideal (25) ____ of communication includes being direct rather than indirect (“ideal" here means that the culture values this style, although not everyone speaks directly). There are several expressions in English (26) ____ emphasize the importance of being direct: “Get to the point! Don't beat around the bush! Let's get down to business!" These sayings all indicate the importance of dealing directly with issues rather than (27) ____ them. One way to determine whether a culture favors a direct or indirect style in communication is to find out how the people in that culture express disagreement or how they say, “No”. In Japan, there are at least fifteen ways of saying “No”, without actually saying the word. Similarly, in Japan, it would be (28) ____ rude to say directly “I disagree with you” or “You're wrong”.
Many Americans believe that "honesty is the best policy" and their communication style reflects this. Honesty and directness in communication are strongly related. It is not a (29) ____, then, to find out that cultural groups misjudge each other based on different beliefs about directness and honesty in communication.

(26)....................

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks.
In Japan, politeness and good manners are very important and business meetings are very formal. Business cards are also important and they (1).....these at the beginning of a meeting. They always look at them carefully, so you should do the same as they might think you're rude if you don't. A lot of communication is non-verbal. They are very good listeners and may ask a lot of questions to  (2)...... they understand everything.
In a conversation they  wait  longer  before  they  reply  than  westerners  do,  so  it's  important  (3)........ speak in those long pauses but to wait for their reply. In their culture it's rude to ask direct questions or to say 'No' or 'I disagree'. In business it takes a long time to (4)...... a decision because they have to ask everyone in the company. When they say 'Yes' it may mean 'I understand', not 'I agree', and when they smile it might be because they don't know (5) ....... to say.
(2)..........................

Fiberscopes are one of the most important Outcomes of the science of fiber optics. Fibers made of glass and transparent acrylic plastic are capable of conveying light energy, and when thousands of these fibers are combined in what is called a fiberscope, they can transmit images. The most common fiberscopes contain about 750,000 fibers, each 0.001 centimeter, or 10 microns, in diameter. For certain uses, the diameter of the fiber may be as small as 5 microns.
Fiberscopes have a wide range of applications. In the medical field, physicians use fiberscopes to examine internal organs and as an aid in delicate surgeries. Miniature probes have also been developed to view muscle fiber, skin tissue, and blood cells. Fiberscopes have also found varied uses in industry, particularly to inspect or control operations in inaccessible areas. Bundles of fiberscopes fused together in a solid plate, called a faceplate, are being used in the manufacture of television picture tubes and other cathode-ray tube devices. 
The most far-reaching applications of fiber-optic technology are in communications. Optical fibers carry voice messages for telephone service. The sound of the voice is electronically broken down into thousands of pulses per second, which causes a transmitting laser to send coordinated pulses of light through the optical fibers. At the receiving end, the light pulses are converted to electrical signals and the voice message is reconstructed. Light-wave communication systems can handle an immensely greater number of telephone calls and television programs than the current system, and they will form the basis of the "electronic superhighway" expected to crisscross the nation in the near future of the information age.

The word "particularly" in paragraph 2 is closest in meaning to _________

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks. 
A scientist said robots will be more intelligent than humans by 2029. The scientist's name is Ray Kurzweil. He works for Google as Director of Engineering. He is one of the world’s leading experts on (1) ______ intelligence (A.I). Mr Kurzweil believes computers will be able to learn from experiences, just like humans. He also thinks they will be able to tell jokes and stories, and even flirt. Kurzweil‘s 2029 prediction is a lot sooner than many people thought. The scientist said that in 1999, many A.I. experts said it would be hundreds of years (2) ____ a computer was more intelligent than a human. He said that it would not be long before computer (3) ______ is one billion times more powerful than the human brain.
Mr Kurzweil joked that many years ago, people thought he was a little crazy for predicting computers would be as intelligent as humans. His thinking has stayed the same but everyone else has changed the way they think. He said: “My views are not radical any more. I've actually stayed (4) ______. It's the rest of the world that's changing its View.” He highlighted examples of high-tech things we use, see or read about every day. These things make us believe that computers have intelligence. He said people think differently now: "Because the public has seen things like Siri (the iPhone’s voice-recognition technology) (5) ______ you talk to a computer, they've seen the Google self-driving cars."

(2)..........

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The blue whale is the largest animal ever known to  have existed. During the 20th century,  the species was almost exterminated due to commercial whaling. The species has slowly recovered following the global whaling ban but it remains endangered and faces a  number of  serious threats including ship strikes and the impact of climate change.
Blue whales are simply enormous with most ranging in length from 24-30 m. The largest  ever recorded was a gargantuan 33.5 m long. Females are up to 10 m longer than males. And they can weigh up to 200 tonnes. Just to put that in perspective: an adult male African elephant weighs 6 tonnes. The blue whale's heart is the size of a small car and its beat can be detected two miles away. But that's nothing compared to their calls. Blue whales are the loudest animals on earth and their calls are louder than a jet engine: reaching 188 decibels, while a jet's engine hit 'just' 140 decibels. Apart from their gigantic size, blue whales can be identified by their relatively small dorsal fin, a fairly rounded rostrum (anterior part of the skull), and approximately 90 ventral  grooves, which reach the navel. They also have row of 300-400 baleen plates on each side of the mouth, which are black in color and range in length from 50 cm in front to 100 cm in back.
Blue whales mostly travel alone or in groups of 2-3. Larger groups of up to 60 whales have been reported and are probably associated with feeding grounds. However, the blue whale has the most powerful voice in the animal kingdom and its low-frequency sounds can travel in deep water over hundreds, or even thousands, of miles. Under these circumstances, animals which may appear to us to be traveling alone may actually be in constant contact with one another.
At birth, a blue whale calf is the largest baby on earth: approximately 8m long and weighing about 4 tonnes. They grow at a rate of 90 kg per day and wean after 7-8 months, once they have reached about 15 m in length, and are able to follow the normal migration pattern alone. They reach sexual maturity at 5-10 years. This growth rate is astonishing and is probably the fastest in the animal kingdom.  From  conception to weaning, it represents a several billion-fold increase in tissue in just over a year and a half. Like other baleen whales, the blue whale has no teeth so it is hard to tell its age but scientists believe they live until at least 50.
Like other large whales, blue whales are threatened by chemical and sound pollution, habitat loss, overfishing of krill, ship strikes and becoming entangled in fishing gear. Climate change could also have a major impact on its food supply, since global warming and associated ocean acidification may impact krill populations. In addition, frontal zones - critical whale habitats - are projected to move further south due to climate change. Frontal zones are boundaries between different water masses, where water can rise from the depths, bringing with it large amounts of nutrients that stimulate the growth of phytoplankton and support substantial populations of prey species for whales. Blue whales would have to migrate further (perhaps 200-500 km more) to reach and feed at these food-rich areas where they build up reserves to sustain themselves for the rest of the year. These longer migration paths could increase the energy costs  of migration and reduce the duration of the main feeding season. As frontal zones move southward, they also move closer together, reducing the overall area of foraging habitat available.

What does the word "wean" in paragraph 4 mean?

Choose the underlined word or phrase (A, B, C or D) that is incorrect and needs to be changed: Some of the pictures he painted them were sold for millions of dollars