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- 3选择 Is ____ your brother?A.the boy B.a boy
- 4be born
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- 6如图,在△ABC中,BC=2,BC边上的高AD=1,P是BC边上任一点,PE∥AB交AC于点E,PF∥AC交AB于点F. (1)设BP=x,请写出用x表示S△PEF的表达式; (2)P在BC的什么位置时,S△PEF取得最大值?
- 7“文具”的英语
- 8When you smile the whole world stops and stares for a while…这句话是什么意思
- 9There were few people there.改成反义疑问句
- 10备注: