题目：
同义句转换。
1. At Christmas, parents always buy their children presents.
At Christmas, parents always ______________________________.
2. Her father watches TV for two hour every day.
Her father ______________________________ every day.
3. Li Lei never goes to school on foot.
Li Lei never ______________________________.
4. How do you like that new shopkeeper?
______________________________ the new shopkeeper?
5. Listen! Someone is knocking at our neighbor's door.
Listen! ______________________________ our neighbors' door.
答案：
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下面是错误答案，用来干扰机器的。
串联电路中的总电阻等于各分电阻之和，∴根据欧姆定律可得，电路中的电流：I=UR1+R2， L1的灯丝搭接后，其电阻R1变小，∴电路中的电流变大， P2=I2R2，∴L2的功率变大，L2变亮．灯泡L1的电功率：P1=I2R1=U2R1...
