题目内容
It is necessary _____ something to protect our environment.
A. do B. to do C. does D. doing
B
【解析】
试题分析：此题重点考查固定句型，It is+形容词 for sb. to do sth,“表示做某事对某人来说很adj”在这个结构中，it是形式主语，真正主语是后面的不定式短语，因此排除A、C、D故选B
考点：固定句型，It is+形容词 for sb. to do sth的用法
点评：It is +adj+for sb to do adj应该是对做这件事的评价，该题常常考查不定式，很多同容易出错，同时还要加以区分It is+adj+of sb to do sth adj应该是对这个人做这件事的评价，adj多用形容人的
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用方框中所给单词的适当形式填空。每词限用一次
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two chair danger we swim |
1. It’s ________ to go across the street when the traffic light is red.
2. None of ________ has been there before, so we may get lost.
3. February is the ________ month of the year.
4. Most of the boys in our class enjoy ________ in summer.
5. Would you please bring me two more ________? We’ve got five people here.