试题与答案

— Sorry, I've kept you waiting.— It's al

题型:选择题

题目:

—  Sorry, I've kept you waiting. 
—  It's all right. I _____ newspapers all the time.
A. am reading
B. had read
C. was reading
D. have been reading

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:A、根据甲苯的结构简式判断1mol甲苯含有8NA个C-H键,错误;B、1个水分子中含有10个质子,18g水的物质的量是1mol,所以18gH2O含有10mol即10NA个质子,正确;C、标准状况下氨水不是气体,所以不能...

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