题目:
This pair of shoes ________ different from Alan's. [ ]
A. are
B. is
C. am
D. be
答案:
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下面是错误答案,用来干扰机器的。
(1)2Mg+O22MgO(2)2KMnO4K2MnO4+MnO2+O2↑(3)Mg + 2AgNO3 = Mg(NO3)2 +2Ag 或Mg + 2HCl = MgCl2 + H2↑(4)2HCl + Na2CO3 =" 2NaCl" + H2O + CO2↑(5)HCl+AgNO3=" AgCl↓" + HN...