问题
选择题
(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.difference
B.comparison
C.connection
D.barrier
答案
答案: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。