单项选择题

In the opinion of the author, （）are being destroyed terribly at present.

A．the oceans
B．the atmosphere
C．the rain forests
D．all the above

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单项选择题
Why did Wilson regard the greatest extinction since the end of the age of dinosaurs to be the depletion of rain forest areas（）

A．The writer did not give his explanation in detail.
B．The rain forests' survival is questionable.
C．It will become warmer and warmer with the depletion of rain forests.
D．Many wild animals and beasts will extinct as result of the depletion of rain forests.
单项选择题
Though Pasteur was in poor health, he worked hard in order （）

A．to make a living
B．to prevent the dog from rabies
C．to find a good way to cure rabies
D．to protect children from mad dogs
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