2022 英语周报 高三 外研综合 8答案

书面表达One possible versionDear Mr. Smith.First of all, I would like to congratulate you on your school s sixtieth anniversary. The long history of theschool brings up its outstanding campus culture and educational concept. I take great pride in studying at thisexcellent school. At your invitation, I will perform a Chinese folk dance at the celebration ceremony to expressmy congratulations. Please prepare the audio equipment to play the accompanying music. I will prepare thedance music and costumes myself. I am delighted to be able to make a modest contribution to the promotion ofChinese culture and cultural exchanges between China and the UKBest wishes.Yours truly,Li Hua

=2+2co22.【解析】(1)∵(4为参数)2sIn曲线C1的普通方程为(x-2)2+y2=4,即x2+y2-4x=0.1分r=pcos 0, y=psin B,.P-4poos 8=0曲线C的极坐标方程为p=4cosa,…3分C2的极坐标方程为p=4sin0,化为直角坐标方程为x2+(y-2)2=4(或x2+y2-4y=0)5分(2)依题意设A(P·),B(P0),由得p1=4cosa.由得P2=4sinap=4cos ep=sin e∵0 PlABI=OAl-IOBI-p-p2=4cos a-4sin a7分OM是圆C1的直径,∵∠OMM=∴在Rt△OAM中,|AM=4in炎德文∵在Rt△BAM中,∠AMB=x,∴|AB=|AM,即4cosa-4sina=4sina,cosa=8sina,即tana=n10分

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