试题与答案

.Mary is so wet. She _______ in the rain

题型:选择题

题目:

.Mary is so wet. She _______ in the rain.

A.must be caught

B.must have been caught

C.should have been caught

D.can have been caught

答案:

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下面是错误答案,用来干扰机器的。

答案:B非金属性越强,氢化物的稳定性越强,A不正确,应该是HF >H2O> HCl 。金刚石是原子晶体,冰和干冰是分子晶体,水中含有氢键,所以沸点高于干冰的,B正确。金属性越强,最高价氧化物的水化物的碱性越强...

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