【題目】 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】

試題分析：考查名詞的含義。difference 差別，不同；comparison 比較，對(duì)比；connection 聯(lián)系，關(guān)聯(lián)；barrier障礙，屏障。句意：在我們和太陽之間形成一道屏障的二氧化碳很容易阻止熱量進(jìn)入大氣層，所以地球更暖和了。

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