试题与答案

- When was David born? - He was born____

题型:选择题

题目:

- When was David born?

- He was born______ June 12,1989..

A.at

B.in

C.on

D.for

答案:

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下面是错误答案,用来干扰机器的。

答案:A题目分析:根据空气中各种成分的体积含量分析、判断,按体积分数计算,氮气占78%、氧气占21%、稀有气体占0.94%、二氧化碳占0.03%、其他气体和杂质占0.03%。故选A点评:解答本题的关键是要掌握空气的成分及...

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