第35题: [单项选择]Dr. Wang has made much contribution to the theories of modem physics at the ______ of his health. A. cost B. disposal C. mercy D. expenditure 参考答案:A 答案解析:[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