题目内容

It is necessary _____ something to protect our environment.
A．doB．to doC．doesD．doing
B

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
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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