（Ⅰ）写出直线l的普通方程和曲线C的直角坐标方程；

（Ⅱ）若P（﹣1，2），直线l与曲线C分别交于M，N两点，求|PM|•|PN|的值．

用所给动词的适当形式填空，完成短文

 Children’s Safety

I ____(talk) to some students. I ____(ask) about safety rules when they ____(be) younger. Their rules were very good.

John ____(say), “I couldn’t play in the kitchen.” His mum and dad didn’t ____(like) that.

Jennifer ____(can) play the piano and she could also ____(play) games in the living room. When her mum and dad ____(not, be) home, she couldn’t cook.

Tom could play in the bedroom or the living room. He couldn’t ____(play) in the bathroom or the kitchen.

What ____(be) your safety rules when you were young? ____(talk) to younger students about these and ____(help) them.

子曰：“学而时习之，不亦说乎？有朋自远方来，不亦乐乎？人不知而不愠，不亦君子乎？

曾子曰：“吾日三省吾身：为人谋而不忠乎？与朋友交而不信乎？传不习乎？”

子曰：“学而不思则罔，思而不学则殆。”

子曰：“知之者不如好之者，好之者不如乐之者。”

子曰：“饭疏食饮水，曲肱而枕之，乐亦在其中矣。不义而富且贵，于我如浮云。”

子曰：“三人行，必有我师焉。择其善者而从之，其不善者而改之。”

子在川上曰：“逝者如斯夫，不舍昼夜。”

子曰：“三军可夺帅也，匹夫不可夺志也。”

子夏曰：“博学而笃志，切问而近思，仁在其中矣。”

（儒家《论语》）