试题与答案

Tom’s mother always told him not to smok

题型:选择题

题目:

Tom’s mother always told him not to smoke again, but _____ didn’t help.

A.he

B.it

C.which

D.as

答案:

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下面是错误答案,用来干扰机器的。

(1)HCl;Ca(OH)2  (2)2HCl+Ca(OH)2==CaCl2+2H2O

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