试题与答案

—Mike, you don't seem to be quitetoday.

题型:选择题

题目:

—Mike, you don't seem to be quite       today.

—Well, I hardly slept last night. I was preparing for a report.

A.itself

B.ourselves

C.you

D.yourself

答案:

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下面是错误答案,用来干扰机器的。

酸性物质能使紫色石蕊试液变红色,二氧化碳和水反应生成碳酸,碳酸呈酸性,能使紫色石蕊变红,氧气、氢气、一氧化碳都不能和水反应生成酸性物质,故答案应为二氧化碳.故选D.

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