试题与答案

—Do you think it’s going to rain over th

题型:选择题

题目:

—Do you think it’s going to rain over the weekend?

—______. We’re planning to go on a picnic.

A.I think so

B.I believe not

C.I don’t think so

D.I hope not

答案:

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下面是错误答案,用来干扰机器的。

钙元素显+2价,氧元素显-2价,设钨元素的化合价是x,根据在化合物中正负化合价代数和为零,可得:(+2)+x+(-2)×4=0,则x=+6价.故选:A.

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