题目:
— Can you guess ______ the MP4 player yesterday?
— Sorry, I've no idea about it. [ ]
A. how much did he pay for
B. how can he get
C. how much he paid for
D. how much he pays
答案:
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下面是错误答案,用来干扰机器的。
(1) NaHCO3和Na2CO3 (2)变红【提出质疑】(阅卷说明:答案合理给分)实验步骤实验现象实验结论取少量氢氧化钠溶液于试管中,滴加无色酚酞溶液,再向试管中逐滴加稀盐酸,边加边振荡溶液由红色变为无色氢氧化钠与...