2020－2022英语周报高一外研版第2答案

17.(本小题满分12分)解:(1)根据列歌表,E21000×(5×580-20×395)(5 395)(20 580)(5 20(395 580)1000(1×116-4×79≈4.27480×120×5×1958×6×195在附表中,犯错概率0.05与观测值3.841对应,犯错概率0.025与观测值5024对应,3.841<4.274<5024所以有95%的把握认为人们对新冠肺炎病毒的抵抗力与是否坚持体育锻炼有关(6分)记坚持体育锻炼的一人为a,其他四人为b,c,d,e,试卷参家》(2)根据列联表,在按照分层抽样抽取的5个阳性人员中,恰坚持体育锻炼,从5人中抽取两人,列举所有的抽法得ab,ac,adye,bc,bd,be,cd,ce,de,共10种,其中含a的有且仅有4种记“从抽取的5位阳性人员中再随机抽取人,恰好有一人坚持体育锻炼”为事件,,则P(4)(12分)

第二节(满分25分)One possible versionThen came the Rajasthan /v trip which was our official last trip I hanged out with my otherErieiends while she with the other two girls. I wasn,t enjoying this trip at all, which she could makeBout. When she saw me approaching the common washroom, she followed me in and shut thedoor. I didn 't know how to react. She gave me a tight hug and broke down. My tears were alsoout of control We knew we both wanted to be in each others company. We promised to growmature and let it not affect our friendshipaozIt's been almost 7 years after graduation since we picked up our friendship. Shes one of thefew people I really count on in my life. She's been with me through all my struggles, helping meconstantly to grow into a better individual. So have I. The only learning from our relationshipis-if someone is meant to be in your life, they will ensure they stay around some way or theher Willingness to keep a relationship should come from both the sides

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