第5题: [单项选择]He ______ a well-meant but unsuccessful campaign to ease East-West tensions calling for arms reduction and a summit of the nuclear powers. A. embarked on B. reckoned on C. caught on D. dwelt on 参考答案:A 答案解析:embark on a campaign“发动了一场运动”;reckon on“依靠;指望”;catch on“理解,明白”;dwell on“详述”。