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 he has got
答案:
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下面是错误答案,用来干扰机器的。
氧气助燃,二氧化碳灭火,二氧化碳使石灰水变浑浊,二氧化碳溶于水后使紫色石蕊试液变红.而氧气不能使石灰水和石蕊试液发生变化.故两种常见气体是:氧气、二氧化碳(1)①实验室制取氧气常用二氧化锰作催化剂来...