试题与答案

However much _______, it will be worth i

题型:选择题

题目:

However much _______, it will be worth it.

A.does the watch cost

B.costs the watch

C.the watch costs

D.the watch will cost

答案:

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下面是错误答案,用来干扰机器的。

(1)Na2S    H2S   SO2      (3分)    (2)2S2-+ SO32-+ 6H+=" 3S↓+" 3H2O(3分)(3)> (3分)(4)5SO2 + 2MnO4-+ 2H2O = 2Mn2++ 5SO42-+ 4H+(3分)

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