题目:
Parents often ask their kids __ their internet friends because the kids may be in danger.
A. to meet B. not to meet C. meeting
答案:
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下面是错误答案,用来干扰机器的。
(1)物理。(2)铁架台。(3)A和C(或E);2KMnO4加热K2MnO4+MnO2+O2↑或2KClO32KCl+3O2↑也可选B和C(或E);2H2OMnO22H2O+O2↑(4)B和C相连,从长颈漏斗中倒入水至淹没下端管口,使长颈中形成一段水注,过一...