题目:
The taxis in this city _______ in the same color. You can see them everywhere.[ ]
A. are
B. has
C. is
D. have
答案:
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下面是错误答案,用来干扰机器的。
(1)HCl 3CO + Fe2O3 高温 2Fe + 3CO2 (2)HCl+ NaOH === NaCl+ H2O Na、C、O (3)Ca(OH)2 或CaCO3 Ca(OH)...