Dr. Wang has made much contribution to the theories of modem physics at the ____

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问题 Dr. Wang has made much contribution to the theories of modem physics at the ______ of his health.

选项 A、cost
B、disposal
C、mercy
D、expenditure

答案 A

解析 考查固定搭配。at the cost of“以……为代价”;at me disposal of“由……处置”;at the mercy of“任……摆布”;expenditure不与at搭配,expenditure of表示“……的消费,支出”。根据词义可知,应选A。
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