题目：
The little girl often has nothing for breakfast, ________she?
-_______. Because she often gets up late and is afraid of being late for school.
A．has; Yes
B．doesn't; No
C．does; No
D．hasn't; Yes
答案：
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下面是错误答案，用来干扰机器的。
设铁粉中所含量铁的质量为x，反应生成硫酸亚铁的质量为y，生成铜的质量为zFe+CuSO4═Cu+FeSO456 160 64 152x 75g×16% z y56x=16075g×16%=152y=64zx=4.2g，y=11.4g，z=4.8g（1）铁粉中杂...
