Everyone knows that________ is dangerous to play with fire, but________ is diffi

Everyone knows that________ is dangerous to play with fire, but________ is diffi

题型:不详难度:来源:
Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.
A.it; whatB.what; whatC.what; itD.it; it

答案
A
解析

试题分析:通过分析句子结构,可知逗号之前的句子包含一个宾语从句。宾语从句中,真正的主语是to play with fire,所以需要用it作形式主语;逗号之后包含一个主语从句,且引导词在从句中作主语,表示“什么”的含义,故用what。
点评:形式主语it, 作为形式主语的it并无实际语义,只是为满足语法上的需要,避免句子头重脚轻,它代替的是句子的逻辑主语,概括起来会有如下情况:不定式作逻辑主语;从句作逻辑主语;动名词短语作逻辑主语。解答这类题,首先要确定从句是什么从句,然后依据相应的语法规则答题。名词性从句中引导词的确定,要看它在名词从句中作什么成分,有什么实际意义。
举一反三
___ in the regulations is that you ___ other people the password of your e-mail account.    
A.What is required; not tell              B As is required; shouldn"t tell
C.It is required; not tell                D.It requires; shouldn"t tell
题型:不详难度:| 查看答案
______ in the regulations is that you _____ other people the password of your e-mail account.
A.What is required; not tell B.As is required; shouldn’t tell
C.It is required; not tell D.It requires; shouldn’t tell

题型:不详难度:| 查看答案
_____ the city’s public school system should be open to the children of migrant workers has become the focus of discussion.
A.That B.What C.Whether D.If

题型:不详难度:| 查看答案
It remains doubtful ______ immediate measures could be taken to prevent underground water pollution.
A.howB.whetherC.thatD.where

题型:不详难度:| 查看答案
It makes no difference to him______ you stay here or go to Hong Kong.
A.howB.whetherC.whatD.why

题型:不详难度:| 查看答案
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