2021-2022 英语周报 高考 oT13答案

第三节书面表达One possible version:Dear PeterHow about your life? I am writing to convey my grati-de for your kind help and care during my stay in yourcountry, without which I wouldnt have enjoyed itmuchGuided by you, I had a chance to visit some places ofinterest in England and experience such unique culture aswell as beautiful scenery. Thanks to your generous help, Ido believe that I have a better understanding of your countryand culture. What's more, during the week, the comfortable room, delicious meals and especially your friendlyfamily made me feel at homeI will be more than pleased if I have the opportunity to"repay your kindness. I will show you around in China. I amlooking forward to your coming.YoursLi H

22.解:(1)设焦距为2c,因为直线BF的倾斜角为120°所以=3,即b=√3c,又因为|A2F|=1,所以a-c=1,即代入a2=b2+c2,并化简得3c2-2c-1=0,解得c=1,所以a=2,b=3,所以椭圆C的方程为+=1.(4分)(2)由椭圆方程,可知A2(2,0)把设P(x,y),直线A2P的方程为y=k(x-2)(k≠k,即M(1得则kM直线QM:y+k又F(1,0),则令x=0,得Q(o.-k(6分同理kk(x-2)联立方程组并消去又FP⊥FQ所以一4k2得(4k2+3)x2-16k2x+16k2-12=0,△>0由2n=162所以直线A2P的方程为(12分)

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