(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,在我們與太陽之間設(shè)置了一道屏障,阻止熱量輕易地散發(fā)到大氣層中,因此地球正變得更暖和。A項意為區(qū)別,不同B項意為對比,比較C項意為聯(lián)系;D項意為障礙,屏障。故選D項。

 

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