题目内容
Air, or _______ is called the atmosphere, surrounds the whole world.?
A. what B. which?
C. that D. it?
A
解析:
此题考查名词性从句。由题意“空气，或称之为大气，环绕着整个地球”可知or is called the atmosphere是作air的同位语，且同位语是一句子，缺少主语，因此要用what，what=the thing which(that)。that在引导名词性从句时在从句中不作任何句子成分。
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