It is necessary _____ something to protect our environment.


  1. A.
    do
  2. B.
    to do
  3. C.
    does
  4. D.
    doing
B
試題分析：此題重點考查固定句型，It is+形容詞 for sb. to do sth,“表示做某事對某人來說很adj”在這個結(jié)構(gòu)中，it是形式主語，真正主語是后面的不定式短語，因此排除A、C、D故選B
考點：固定句型，It is+形容詞 for sb. to do sth的用法
點評：It is +adj+for sb to do   adj應(yīng)該是對做這件事的評價，該題常常考查不定式，很多同容易出錯，同時還要加以區(qū)分It is+adj+of sb to do sth  adj應(yīng)該是對這個人做這件事的評價，adj多用形容人的
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