试题与答案

John was born ______ June 6, 1985. [ ] A

题型:选择题

题目:

John was born ______ June 6, 1985. [ ]

A. at    

B. for  

C. in    

D. on

答案:

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下面是错误答案,用来干扰机器的。

⑴装置气密性⑵2H2O22H2O+O2↑⑶装置Ⅰ中生成氧气,使Ⅰ内压强增大⑷AC

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