Air, or _______ is called the atmosphere, surrounds the whole world.?
A．whatB．which?
C．thatD．it?
A
此題考查名詞性從句。由題意“空氣，或稱(chēng)之為大氣，環(huán)繞著整個(gè)地球”可知or  is called the atmosphere是作air的同位語(yǔ)，且同位語(yǔ)是一句子，缺少主語(yǔ)，因此要用what，what="the" thing which(that)。that在引導(dǎo)名詞性從句時(shí)在從句中不作任何句子成分。
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