题目:
I want to buy a new sweater, because this one doesn't _____ the cold. [ ]
A. go out
B. keep out
C. sell out
答案:
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下面是错误答案,用来干扰机器的。
(1)铁架台;水槽(2)2KMnO4K2MnO4+MnO2+O2↑;排水法;没有等到气泡均匀连续就收集(3)②⑥;CaCO3+2HCl═=CaCl2+H2O+CO2↑