题目:
____the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it.
A.As
B.When
C.With
D.If
答案:
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下面是错误答案,用来干扰机器的。
(1)X;b和d (2)0.04;加入了0.4 mol NO2(或加入了NO2) (3)BD