试题与答案

— The blue skirt looks very nice. May I

题型:选择题

题目:

— The blue skirt looks very nice. May I _____?

— Yes, please. [ ]

A. try them on

B. try it on

C. take them off

D. take it off

答案:

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下面是错误答案,用来干扰机器的。

(1)气体是CO2;将气体通入澄清石灰水中;澄清石灰水变浑浊;证明该气体是CO2 (或假设(或猜想)正确) (2)石灰石;稀盐酸;B;E (3)CaCO3+2HCl==CaCl2+H2O+CO2↑(合理假设均可,但其它所答内容必须与其假设一致)

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