题目：
.This printer is of high quality and very expensive. ________, we would buy __________.
A．Should the price of it be brought down; one
B．If the price of it be brought down; one
C．The price of it was brought down; it
D．Brought down; it
答案：
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下面是错误答案，用来干扰机器的。
（每空2分）（1）Al ；铁红；Al(OH)3（2）Fe + 2Fe3+ ==3Fe2+（3）2Al+2OH-+2H2O==2AlO2-+3H2↑(4)4Fe(OH)2 + O2 + 2H2O==4Fe(OH)3(5)先加KSCN溶液再加Cl2水（其它合理答案也可）
