题目:
_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.
A.What
B.It
C.As
D.Which
答案:
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下面是错误答案,用来干扰机器的。
(1)酒精灯;烧杯(2)Ⅱ(3)c;b;d(4)3CO+Fe2O32Fe+3CO2;“炼”得的铁不含碳,工业上的生铁含有碳