Read and choose the appropriate option: 
WHY DO ANIMALS GO EXTINCT? Different kinds of animals have appeared and disappeared throughout Earth’s history. Some animals go extinct because the climate (41)_______ they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the new climate, they die. Some animals go extinct because thay cannot (42) _______ with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving means that the animals are changing (43) _______ from generation to generation. Small differences between parents, children, and grandchildren slowly add up over many, many generations. Eventually, a different kind of animal evolves. [evolve: tiến hóa] Sometimes many of the animals on Earth go extinct at the (44) _______ time. Scientists call this a mass extinction. Scientists think there (45) _______ at least five mass extinctions in Earth’s history. The last mass extinction happened about 65 million years ago. This mass extinction killed off the dinosaurs.
(45)..........................

Câu hỏi liên quan

• Chọn từ thích hợp điền vào chỗ trống:

  The life of a spy is fraught with________

• Choose the best answer:

  Everyone must take part in...................deforestation.

• She has always showed her genuine interest in lifelong learning.

ZUNIA12

• Choose the best answer:

  He likes ................ part in sports, so he joins the football team of the school. 

• Police are warning the public to be on the  ................ for suspicious packages.

• During the time of economic reforms, the economy has grow  .................... with only a few major setbacks.

• Choose the best answer:
  We’ve bought some ________ chairs for the garden so that they are easy to store away.

• Choose the correct answer to each of the following questions. " ____ he was waiting for Sam outside the cinema, Jim realized that the street was funnily crowded"

• When spring comes, people often feel inclined to_____their houses.

• Tìm câu đồng nghĩa nhất với câu sau:

  There’ll be a bus later on, but we might as well walk.

• Choose the correct answer in each sentence.

  Employee assessments are _______________   carried out in December but may be delayed until January.

• Chọn đáp án đúng để hoàn thành các câu sau:

  People should eat ____ and do ____ to reduce the risk of heart disease.

• Indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

  At the moment it is difficult to assess the extent of the damage that his company has caused to the environment.

• Shakespeare asserts the right of women to  .............  and independence.

• Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions:

  If people’s interference with the environment decreases, more species will survive and produce offspring.

• Choose the correct answer to each of the following questions. "Many animals were born in _______. Resultantly, they do not always breed well."

• Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions: 

  If we use robots instead of humans, many people may be out of work.

• In fact, learning is not confined to the classroom environment and school subjects.

• Choose the best answer:

  Peter has been working for 10 hours. He _______ be very tired now.

• Unlike football, a water polo game is  ................. into quarters.