(1)An animal species dies out when it fails to produce enough young in each generation to keep pace with the death rate. We can tell from fossil evidence in rocks that many living species have no longer been in existence over the millions of years since life began. It is a natural process, and dying out is the fate of any animal that has specialized too much to change with its changing environment, or has to compete with a better adapted and more powerful animal. Because of wonderful technical developments during the past few centuries, man has destroyed or has nearly destroyed some species by killing them at such a rate that they couldn't produce enough young, or by completely changing their natural environment at surprising speed. (2)Examples can be given of the way in which natural environments are being rapidly changed. There is every possibility that many species of animals will die out because of their disappearing food source. Large numbers of animals have been hunted and killed for food. The North
One way to protect species from the threat of dying out is to _________.
- A、build up walls to isolate animals in nature from people
- B、put all the hunters into prison and keep them there
- C、educate people in general to protect animals well
- D、place animals in zoos and breed them there safely
正确答案:D
答案解析:有
Why do tourists go to places where they can watch wildlife?
- A、They can add to the income of troubled countries.
- B、They can make themselves happy by seeing animals.
- C、They can encourage the growth of natural places.
- D、They can make use of animal resources more often.
正确答案:B
答案解析:有
How do wildlife protection areas protect endangered animals?
- A、They use police help to protect them.
- B、They prevent hunters from killing them.
- C、They make the areas like natural places.
- D、They provide the animals with much food.
正确答案:A
答案解析:有
What might happen to an animal species if it specialized too much?
- A、It might produce more young.
- B、It might compete even better.
- C、It might be forced to change.
- D、It might die out in the end.
正确答案:D
答案解析:有
According to the passage, when will animal species become extinct (灭绝)?
- A、When it suffers a disease it has never known before.
- B、When it has been in existence for too many years.
- C、When it has a death rate that is made faster by man.
- D、When it produces babies slower than the death rate.
正确答案:D
答案解析:有
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