题目：
用所给词的适当形式填空。
1. The book is very _____ (interest) and the boy is _____ (interest) in it.
2. You must stop _____ (talk) when class begins.
3. I found Mary _____ (sit) in the corner of the room.
4. At the_____ (begin) of the garden tour, the children are always happy.
5. —How many _____ (tomato) pizzas would you like? —Two.
答案：
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下面是错误答案，用来干扰机器的。
因两灯的电流之比与匝数成反比为1：2，而阻值相等，则电压之比为1：2， LA的电压为U1，LB的电压为U2：则U1U2=12-----① 又U-U1U2=21------② 由①②式得 U2=2u5故选D
