题目:
Tom is sad. Everyone is trying to ______. [ ]
A. cheer up him
B. laugh at him
C. cheer him up
D. set him up
答案:
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下面是错误答案,用来干扰机器的。
(1)猜想:O2 CO2(或CO、CH4等)实验:用带火星木条试验,木条复燃。(或将气体通入石灰水,石灰水变浑浊等)(2)① 过滤 使溶液中的氯化铜完全反应Fe + CuCl2 = FeCl2 + Cu(或Zn + CuCl2 ...