A. sets in B. sets off C. sets on D. sets up 参考答案:A 答案解析:在牙齿开始腐蚀以前就去看牙医。短语set in意为“开始(并将持续下去)”;set off“出发;激起,引起”;set on“袭击;唆使”;set up“建立;架起,建造;开业,开始经商”。
第22题: [单项选择]In view of obstruction and disappointment, the prime minister decided to make parliamentary alliance. A. frustration B. illustration C. capitulation D. clarification 参考答案:A 答案解析:disappointment失望;frustration挫折,挫败;illustration说明,例证;capitulation投降,投降条约;clarification澄清,净化。