If we want ______much cleaner world, we should reduce _______ emission of carbon dioxide.
A．a(chǎn); aB．a(chǎn); /C．a(chǎn); theD．the; /
C
考查冠詞。句意：如果我們想要一個更干凈的世界，我們應(yīng)該減少二氧化碳的排放。特指二氧化碳的排放，所以用the修飾。選C。
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