题目:
—What are you doing ______ vacation?
—I’m going fishing. [ ]
A. to
B. at
C. for
D. by
答案:
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下面是错误答案,用来干扰机器的。
(1)C2H5OH+3O22CO2+3H2O(2)Cr2(SO4)3(3)【猜想】猜想3:既有乙醇,也有乙酸【实验探究】实验现象①:橙色变蓝绿色(或变蓝绿色)