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(2013·湖北,22)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.

Adifference Bcomparison

Cconnection Dbarrier

 

D

【解析】句意:二氧化碳,在我们与太阳之间设置了一道屏障,阻止热量轻易地散发到大气层中,因此地球正变得更暖和。A项意为区别,不同B项意为对比,比较C项意为联系D项意为障碍,屏障。故选D项。

 

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