The air ______ different gases _____ together.


  1. A.
    consist of, mixing
  2. B.
    is made up of, mixed
  3. C.
    consisting of, mixed
  4. D.
    makes up, mixing
B
試題分析：考查固定詞組。固定詞組consist of="be" made up of由…組成；consist of沒有被動(dòng)語態(tài)，沒有進(jìn)行時(shí)。本題第二空的gas與mix構(gòu)成被動(dòng)關(guān)系，故使用過去分詞的形式mixed。句意：空氣是有混合在一起的不同的氣體組成的。故B正確。
考點(diǎn)：考查固定詞組
點(diǎn)評(píng)：固定詞組consist of="be" made up of由…組成；consist of沒有被動(dòng)語態(tài)，沒有進(jìn)行時(shí)。本題要注意分析句子結(jié)構(gòu)，第一空所填的是句子的謂語動(dòng)詞，第二空的mixed together是修飾名詞gases.
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