2. 外语
  3. Humans should not develop their economy at the ______ of the ecological environment.

Humans should not develop their economy at the ______ of the ecological environment.

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问题 Humans should not develop their economy at the ______ of the ecological environment.
选项 A、destruction
B、pollution
C、expense
D、mercy
答案C
解析 本题空格处是说在损害生态环境的情况下。at the expense of的意思是“在损害……情况下，以……为代价”；at the mercy of的意思是“受……的支配”。根据题意， C项为正确答案。
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