China made a promise to the world in the Copenhagen Summit that by 2020.the carbon-intensity of its economy fall 40% to 45%．( )A．shallB．mayC．mustD．should 题目和参考答案——青夏教育精英家教网—

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18．China made a promise to the world in the Copenhagen Summit that by 2020，the carbon-intensity（碳排放强度） of its economy ______ fall 40% to 45%．（　　）

A．

shall

B．

may

C．

must

D．

should

分析在哥本哈根峰会上中国向世界承诺到2020年为止，其经济的碳排放强度会下降40%至45%．

解答答案是A．本题考查情态动词shall的用法．情态动词shall常常用在二、三人称的陈述句中表示"命令、警告、允诺"；根据句中"China made a promise"推断用shall表示承诺，所以答案选A．

点评要在正确理解情态动词的基本含义的基础上，整体理解语境中的情感态度，做出合理的判断．

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