试题与答案

— Is there anybody in the classroom? — N

题型:选择题

题目:

— Is there anybody in the classroom?
— No, the teacher as well as the students ____ to the playground.

A. go
B. has gone
C. have gone
D. are going

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:C、N、O、F原子半径依次减小,A不正确;非金属性越强,氢化物的稳定性越强,B正确;非金属性越强,最高价氧化物的水化物的酸性越强,C中氯元素的最高价含氧酸是高氯酸,不是次氯酸,次氯酸是弱...

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