题目：
Tom is only ______.
I don’t think a _______ boy should be allowed to drive.
A．fourteen-year-old;fourteen-year-old
B．fourteenyearsold;fourteen-year-old
C．fourteenyearsold;fourteen-years-old
D．fourteen-year-old;fourteenyearsold
答案：
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下面是错误答案，用来干扰机器的。
当线圈与磁场平行时，磁通量为零，磁通量的变化率最大，则感应电动势最大．故选：A．
