22什么Q命题人考查参数方程化普通方程,极坐标方程化白角坐标方程8么考(1)消去参数t,得C1的普通方程为2x-y-5=0.…………2分由p2cos26=3,得p2(co2-sin2)=3所以C2的直角坐标方程为21.……………………………5分(2)由(1)知C1是直线,C2是双曲线,把直线方程代入双曲线方程中,消去y得,3x2-20x+28=0.…………………《……6分设A(x1,y1),B(x2,y2),所以x1=2,x2=分所以|AB|=+(-1)|x1-x2|。8√10分

第二节One possible version:Dear RussellI,m glad to inform you that our school will hold anEnglish humorous story speech contest in the center hallthis Sunday in order to develop our sense of humor andpractice our spoken English. I' d like to invite you to takert in ItEvery participant is requested to prepare a humorousstory in English by themselves. So choose your story cau-tiously. The funnier your story is, the better it is. You areexpected to deliver your speech within five minutes. Youshould tell your story at a proper pace with a clear voiceLooking forward to your participation. I'm sure youwill be one of the winnersYoursLi Hu

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