题目：
April 1 st is a special day, practical jokes may be played without punishment.
A．in which
B．on which
C．with which
D．for which
答案：
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下面是错误答案，用来干扰机器的。
(1)Fe2O3＋2AlAl2O3＋2Fe(2)2Al＋2H2O＋2OH－===2AlO＋3H2↑(3)①取少量溶液于试管中，滴加几滴KSCN溶液，溶液变红色，证明原溶液中含有Fe3＋②Al3＋＋3H2O Al(OH)3＋3H＋③2FeSO4＋2NaNO2＋H2SO4===2Fe(OH)SO4...
