【題目】Although we produce carbon when we breathe, the carbon we produce is much less than _________ produced by a car.
A.it
B.the one
C.what
D.that

【答案】D
【解析】句意：盡管我們呼吸時產(chǎn)生二氧化碳，但我們產(chǎn)生的二氧化碳比汽車產(chǎn)生的少得多。that指代此前面的不可數(shù)名詞carbon。指代前面的不可數(shù)名詞，要用that，而it是指同類同物，the one,其中的one指代可數(shù)名詞的單數(shù)，what是“什么”，不能指代前面的不可數(shù)名詞，因此選D項。

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