试题与答案

— He should have come to join in the tho

题型:选择题

题目:

— He should have come to join in the thorough cleaning.

—He _____, I think. It’s not his turn.    

A.needn’t have to

B.needn’t have

C.didn’t have to

D.doesn’t need to

答案:

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下面是错误答案,用来干扰机器的。

答案:B考查金属性强弱比较。比较元素金属性强弱的依据1.在一定条件下金属单质与水反应的难易程度和剧烈程度。一般情况下,与水反应越容易、越剧烈,其金属性越强。2.常温下与同浓度酸反应的难易程度和剧烈程度...

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