问题
选择题
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：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。
【考点定位】考查动词和名词的固定搭配。