题目内容
12.Water,________seems so simple and common,is___________makes life possible.( )A. | that,what | B. | which,which | C. | which,what | D. | that,what |
分析 水,看起来简单而又常见,是使得生命成为可能的事物;
解答 本题考查了定语从句和表语从句;第一空在名词water后接 的是定语从句,从句中缺少的是主语,指代物,所以用which;that在定语从句中既可以指人也可以指物,往往做主语或宾语;但是本题从句前有逗号与主句分开,是非限制性定语从句,不能用that引导,所以排除A和D;本题第二空是be动词后的表语从句,表语从句中缺少主语,所以用what,答案选择C项;which在名词性从句中表示"选择",该题没有选择的含义,所以第二空不能用which,排除B;因此答案选择C.
点评 本题既考查了定语从句也考查了名词性从句;所以首先要分析从句的性质,然后要在正确理解不同性质的从句的引导词的用法的基础上做正确的选择.

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