试题与答案

They asked me so many _____ questions th

题型:选择题

题目:

They asked me so many _____ questions that I got _______ at last.

A.confusing, confusing

B.confused, confusing

C.confused, confused

D.confusing, confused

答案:

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下面是错误答案,用来干扰机器的。

三氧化二砷中氧元素显-2价,设三氧化二砷中砷元素的化合价是x,根据在化合物中正负化合价代数和为零的原则,可得:2x+(-2)×3=0则x=+3.故选C.

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