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    【题目】 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

    【答案】D

    【解析】

    试题分析：考查名词的含义。difference 差别，不同；comparison 比较，对比；connection 联系，关联；barrier障碍，屏障。句意：在我们和太阳之间形成一道屏障的二氧化碳很容易阻止热量进入大气层，所以地球更暖和了。

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