Air, or _______ is called the atmosphere, surrounds the whole world.


  1. A.
    what
  2. B.
    which
  3. C.
    that
  4. D.
    it
A
此題考查名詞性從句。由題意“空氣，或稱之為大氣，環(huán)繞著整個地球”可知or  is called the atmosphere是作air的同位語，且同位語是一句子，缺少主語，因此要用what，what="the" thing which(that)。that在引導名詞性從句時在從句中不作任何句子成分。
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