【題目】China made a commitment to the world in the Copenhagen Summit that by 2020, the carbon-intensity of its economy ______ fall 40% to 45%.

A. shall B. may C. must D. should

【答案】A

【解析】

試題解析：考察情態(tài)動詞的用法，shall在陳述句中表示說話者給對方的承諾、決心、警告、威脅等。句意：中國在哥本哈根峰會上向世界承諾,到2020年,其經(jīng)濟(jì)的碳強(qiáng)度下降了40%到45%。故選A.

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