题目:
It’s careless ________ him to make the same mistake again. I think it important ________ him to be more careful next time.
A.for; for
B.for; of
C.of; of
D.of; for
答案:
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答案:C题目分析:空气是人类及动植物赖以生存的重要天然资源;空气有自净能力,但排放到空气中有害气体过多会严重污染空气;空气中各成分的含量是体积分数。空气中的稀有气体化学性质稳定,曾被称“惰性气体”。...