2022 英语周报 高考 课标 第4期答案

2+rcosφ,7.解:(1)将曲线C1的参数方程为y= rsin p参数)化为普通方程为(x-2)2+y2=r2,即x2+y2-4x+4-r2=0,由p2=x2+y , ocOS可得曲线C1的极坐标方程为p2-4cos0+4-r20因为曲线C经过点P(2,3)所以22-4×2×cosn+4解得r=2(负值舍去),所以曲线C1的极坐标方程为p=4cos(4分(2)因为A(m,a),B(a,a+2)在曲线C2:2(2+os20)=6上,所以2(2+cos2a)=6P2 2+cos 2(+=P2(2-cos2a)=6,所以CoS LaOAI2 OB 2 pi(10分)

第三节书面表达wersionDear Sir or MadamMy name is Li Hua. As an exchange student fromChina, I am studying in a local school. I am reallydelighted to learn that a volunteer for your Chinese culturallic exhibition is required and I'm confident that I amtruly fit for thestart with, my advantage first lies in the fact that IChina and used to beand quite familiar with Chinese relics. Further-more, being an outgoing and optimistic boy, I am good atcommunicating with others and introducing Chinese cultureto the world is always my honor and my pleasure. Finallythere is no problem with my spoken English, as I havelived here for almost a year and I have no difficulty commu-dicating with others in EnglishI would really appreciate it if you can offer me thechance to be a volunteer in your museum. I am looking forward to your early reply.Li Hua

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