1. The tsunami (海啸) ___ over 160,000 people were killed was a terrible disaster for human beings.

A. of that B. among which C. during that D. in which

【答案】D. 本题考查的是定语从句中关系词与介词的搭配使用。在海啸中丧生的搭配为dead in the tsunami, 因此应选D项，in which。

2. John isn't the same man before.

A. what he was B. that he was C. who he was D. as he was

【答案】D the same ....as...“跟....一样”， 是固定搭配。

3. We’ve tested three hundred types of boot, ____ completely waterproof.

A. no of which B. none of which C. some of that D. neither of which

【答案】B 可以判断该句为非限制性定语从句，而且引导词前有介词，指代物的引导词只能用which,而不能用 that。在这几个否定词中, none 表示对两个以上的事物的否定，neither 表示对两者的否定;它们都可以作代词，后面可以接单数，也可以接复数。no 不能作代词，不能在它的后面用介词。

4. ____ is well known, the key to success lies in hard work.

A. As B. That C. Which D. What

【答案】A.本题考查的是固定搭配as is well known，众所周知的意思。

5. He has made another wonderful discovery, ____ of great importance to science.

A. which I think it is B. of which I think it is C. I think which is D. which I think is

【答案】D 可判断句子为定语从句。有了which 指代discovery，就不应该再出现it;I think 作为插入语。