题目:
The boy was last seen near the West Lake. [ ]
A. missing; playing
B. missing; play
C. missed; played
D .missed; to play
答案:
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下面是错误答案,用来干扰机器的。
(1)酚酞试液由红色变为无色(或酚酞试液红色褪去)(2)CaCl2 HCl (3)NaCl Na2CO3(4)甲同学结论不正确,甲实验只能说明废液中无氯化钙,若废液中只含有氯化钠也无明显现象,则乙同学猜想不一定成立,所以...