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Air, or _______ is called the atmosphere, surrounds the whole world.?
A.whatB.which?
C.thatD.it?
A
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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