2022七年级下次册英语周报答案

参考范文:One possible versionDear Sir or MadamImLi Hua, a Senior Two student. I have read your advertisement for volunteers of the Sino-American YouthAmbassadorsonline Program. I'm writing to apply for participation in this activity.I consider myself a qualified candidate for the several reasons. First of all, a good command of English will make itpossible for me to communicate with fore gA members fluently. Besides, QIm)an outgoing person and have rich experiencein voluntary jobs, which can help get along well with American friends,in the'programI would like to present the long history and diverse culture of China to our friends and also learn more about Americaand its peopleI would appreciate it if you could consider my application and accept me as a member of the program. Lookingforward to your early reply.Yours sincerely,Li Hua

22.解:(1)因消去参数化为x-√3y0C2:p2+4pcos-2pi0+4=0化为x2+y2+4x2y+4=0,即(x+2)2+(y-1)2=14分(2)由题知过点P(1,0)作倾斜角为的直线l1√3的参数方程即为将其代入x2+y2+4x-2y+4=0,可得r2+(3√3-1)t+9=0设A,B对应的参数分别为t1,t2则t1t2=9,即PA|·|PB|=|t1||t2|=9.………10分

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