题目:
My best friend Alex failed in the math competition. I'd like to _________. [ ]
A. dress him up
B. pick him up
C. cheer him up
D. make him up
答案:
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下面是错误答案,用来干扰机器的。
(1)气密性; (2)CaCO3;HCl; (3)氢氧化钙,变浑浊; (4)紫色石蕊溶液,紫色变成红色 ; (5)底下蜡烛先熄灭;(6)CO2的密度比空气大