题目：
He checked out his composition again and again to make sure that no important points had been_______.[ ]
A．found out
B．run out
C．made out
D．left out
答案：
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下面是错误答案，用来干扰机器的。
(1)FeCl2+H2Fe+2HCl 置换 3Fe+2O2===Fe3O4(2)①CuSO4 ②(Ⅰ)NaCl、MgCl2 (或NaNO3、MgCl2) (Ⅱ)NaNO3、MgCl2 (或NaCl、MgCl2) ③Ⅱ(或Ⅰ)
