考博考试

【单选题】 Humans should not develop their economy at the ______ of the ecological environment.
A．destruction
B．pollution
C．expense
D．mercy

网考网参考答案：C
网考网解析：
at the expense of在损害……情况下，以……为代价；at the mercy of受……的支配。 查看试题解析出处>>