第13题: [单项选择]The vault in Mr. Radcliffe's office______ a number of important confidential documents. A. contain B. contains C. containing D. container 参考答案:B 答案解析:空格处应填八句子的谓语动词。并且必须与单数主语(The vault)相匹配。contain是表示“包含”的动词。
A. smiling does good to health B. laughter can be tolerated C. there is a way to reduce pain D. laughter can work the muscles in the feet 参考答案:B 答案解析:本题考查的是考生对细节的把握,答案对应文章第二段,笑的作用在本段都有描述,但没有提到B项。