We can not figure out ________ quite a number of insects, birds, and animals are dying out．

[　　]

A．that

B．as

C．why

D．when

答案：C
提示：

why引導(dǎo)賓語從句，表示“……的原因”�！拔覀儫o從得知為什么大量的昆蟲、鳥類和動物滅絕了�！�


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. In spite of common practice, it is hard to conclude that modern society is built on greed and selfishness, both of which are not newly invented vocabulary. In ancient times people also did greedy and selfish things though such behaviors were more condemned then. But we can not ignore the fact that people in the past lived a relatively more isolated life and faced less pressure compared with their modern counterparts.

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