试题与答案

It is required by law that the children

题型:选择题

题目:

It is required by law that the children above six years old in our country ________ to school to receive education.

A.would be sent

B.are sent

C.be sent

D.will be sent

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:原子半径越大气态氢化物的稳定性越差,非金属性越强,气态氢化物稳定性越强。A项中同主族元素从上到下,原子半径逐渐增大,氢化物的稳定性逐渐减弱,故A不符合。B项中同周期元素从左到右,原子...

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