Question

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

1. A.
   difference
2. B.
   comparison
3. C.
   connection
4. D.
   barrier

Answer 1

D
句意：在人类和太阳之间起重要作用的二氧化碳，防止热很轻松从大气中失去，因此地球正在变暖。make a difference“有影响；起（重要）作用”，这是一个固定搭配。
【考点定位】考查动词和名词的固定搭配。