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 C项at the expense of“在损害……情况下，以……为代价”；D项at the mercy of“受……的支配”。其他两项与at不构成搭配。
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