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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.
    A．differenceB．comparison
    C．connectionD．barrier
    D
    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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