(单选题)

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

参考答案：D

参考解析：

考查名词辨析。句意：二氧化碳构成了我们和太阳之间的屏障，阻止了热量轻易地从大气中散发出去，所以地球变得越来越暖和。make a difference意为“有影响，起（重要）作用”；make a comparison意为“对比，比较”；make a connection意为“联系”；make a barrier意为“障碍，屏障”。根据后面的“prevents heat from getting out of the atmosphere easily”可知，此处指的是二氧化碳构成了屏障。故选D。

知识点：词义辨析英语专业基础知识词汇教师招聘-小学英语