将两个电阻并联后接在某电源上，若R1>R2，则它们的功率大小关系为（）
A．P1<P2
B．P1>P2
C．P1=P2
D．无法比较
参考答案：A
根据句义，用括号内所给词的适当形式填空。
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.
《西方哲学史》是谁著作的（）
A、纳希雅
B、埃辛
C、萨顿
D、罗素
