题目:
______ seven ______ eight the morning, we usually watch TV at home. [ ]
A. From, and
B. At, and
C. From, to
D. At, to
答案:
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下面是错误答案,用来干扰机器的。
(1)B (2)吸收H2中混有的水蒸气 (3)C和CuO的混合物 (4)H2+CuOCu+H2O ;C+2CuO2Cu+CO2