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

• Choose the correct answer in each sentence.

  Customers are asked to acknowledge receipt of their orders by  ______________  their names on a delivery form.

• The storm gradually decreased in ................... as it came close to the coast.

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

  Robert does not have _______ Peter does.

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• I’ve got __________ money to lend you now. I think you can ask Lyn for some

• Choose the best answer:

  Pay the bill within 2 weeks or the electricity will be cut ........................!

• The company had to _______ reparation to those who suffered ill health as a result of chemical pollution.

• Over-exploitation for food, pets, and medicine, pollution, and disease are recognized _______ a serious threat _______ extinction.

   

• Prices are increasing dramatically in big cities. The ..............  seems to go up every day.

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

  Fruit and vegetables grew in abundance on the island. The islanders even exported the surplus.

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

  Many parents may fail to recognize and respond to their children's needs until frustration explodes into difficult or uncooperative behaviour.

• He has been given work as a window cleaner even though he has no ____________ for heights.

• Choose the word(s) CLOSEST in meaning to the following word(s). "captivity"

• Choose the best answer:

  If you want to attend the course, you .............. pass the examination.

• Tony would have forgotten the appointment if I hadn’t ................ him.

• Choose the best answer:

  I .............. a meeting from 9.00 to 10.30 tomorrow morning.

   

• He has got________ money so he can’t buy this latest car.

• We had planned to spend the summer in Greece, but ____ had obviously decided otherwise.

• Choose the correct answer in each sentence.

  The factory is preparing to hire ------------- workers for selected manufacturing plants to meet its quarterly production goals.

• Choose the best answer:

  He was born ........... 15th, January.

•  The pen and paper ……………… on the desk