【题目】Effective measures have been taken to prevent _______pollution.
A. exhausted gas B. exhausting gas
C. exhaust gas D. exhaustion gas
在线课程【答案】C
【解析】试题分析：考查形容词。句意：已经采取有效的措施来阻止废气污染了。A. exhausted 疲惫的，耗尽的； B. Exhausting令人疲惫的；C. exhaust gas废气；D. exhaustion gas枯竭，耗尽；根据词义，故选C项。