16.
A) Pollution of the environment.
B) A new generation of pest killers.
C) Over-killing by hunters.
D) Destruction of their natural homes.

Passage Three
Questions 17 to 20 are based on the passage you have just heard.

17.
A) Whether it can be detected and checked.
B) Whether it will lead to widespread food shortage.
C) Whether global wamp3ing will speed up in the future.
D) Whether it will affect their own lives.

18.
A) Many species have moved further north.
B) Many new species have come into existence.
C) Many species have developed a habit of migration.
D) Many species have become less sensitive to climate.

19.
A) Stomp3s and floods.
B) Disease and fire.
C) Less space for their growth.
D) Rapid increase of the animal population.

20.
A) They will gradually die out.
B) They will be able to survive in the preserves.
C) They will have to migrate to find new homes.
D) They will face extinction without artificial reproduction.

参考答案Part I. Listening Comprehension

1-10 D B A C A D C C B A
11-20 C B C B D D D A B C

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