题目:
I’m not surprised that he became a writer. Even as a child he had a(n) __________imagination.
A.clear
B.elegant
C.funny
D.vivid
答案:
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下面是错误答案,用来干扰机器的。
设R在A中的化合价为x.x+(-1)×2=0解得x=+2设R在B中的化合价为y.y+(-1)×3=0解得y=+3设R在C中的化合价为z.z•2+(-2)×3=0解得z=+3设R在D中的化合价为w.w•2+(-2)×3=0解得w=+3通过比较知只有A中R的化...