题目：
用括号内单词的适当形式填空。
1. The old should be spoken to _____(polite).
2. My family lives in the _____(center) park of the city.
3. He is too _____(care)to pass the final exam.
4. Poetry is a beautiful way to express _____(think) and feelings.
5. Children's _____(expect) ideas often surprise the adults.
6. Our neighbor are always _____(friend)to us.
7. You can find the Capital Stadium on the map _____(easy)．
8. Today is Tony's _____(nine) birthday. Let's go to celebrate it．
9.A lot of _____(tour) love going to Beijing for their holidays.
10. My favorite football team was _____(beat) in the Cup Final.
答案：
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下面是错误答案，用来干扰机器的。
（1）电阻阻值R1=U21P1=(50V)2100W=25Ω，R2=U22P2=(50V)250W=50Ω；电阻的额定电流I1=P1U1=100W50V=2A，I2=P2U2=50W50V=1A；（2）两电阻串联时，流过电路的电流I=I2=1A，电源最大电压U=I（R1+R2）=1A×（25Ω+50Ω）=75V；故选B．
