Most scientists seem to agree that ________ certain limit should be set on________   consumption(消費(fèi)) of cars to ease air pollution.
A．a(chǎn); the B．/; the
C．the; / D．the; the
A
A 考察冠詞。第一空a certain=some；第二空加定冠詞表示特指。句義：許多科學(xué)家傾向于同意為了減輕空氣污染，應(yīng)該對(duì)汽車消費(fèi)設(shè)定一些限制。
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