22.解:本题考查极坐标及参数方程cos r-rT- cOs(1)由C(为参数),可得{sm=2又sm+=1y=v3sin则由C0+)=32,得号(m时+sB=22则C3=05分(2)设椭圆C上的点M(cosa,3sina)(0≤a<2x),则点M到曲线C:x+y-3=0的距离d=1+sng-3l=2sm(a+)-3√21,当sin(a+÷)1时、d=5、,此时、+飞二3x+2kx(k∈D,又因为0≤a<2x所以。=1x此时点M(-1,-3……10分

书面表达One possible version:Dear 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 Hu

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