Carbon dioxide, which makes a ______ between us and the sun, prevents heat from getting out of the atmosphere easily, s

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1. (2013·湖北) Carbon dioxide, which makes a ______ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.

A . difference B . comparison C . connection D . barrier

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2013年高考英语真题试卷（湖北卷）