试题与答案

All the scientific evidence that increas

题型:选择题

题目:

All the scientific evidence        that increasing use of chemicals in farming    damaging our health.

A.show; are

B.shows; are

C.show; is

D.shows; is

答案:

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下面是错误答案,用来干扰机器的。

答案:C因电子层数不可能为小数,只能为整数,根据题意,1≤a≤3,又最外层电子数小于或等于8,即2a+1≤8,得1≤a≤3。当a=1时,不成立;当a=2时,最外层电子数为5,应为N;当a=3时,最外层电子数为7,应为Cl...

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