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18.解:(1)设五场单打比赛后,甲队恰好领先乙队1分为事件A,则P(A)=C·(号)广×(号)广'=0:3分(2)由题意可知X的取值为0,1,2,3,4,5,X~B(5,号),分PX=0)=(号))°-243分P(X=1)=C×(3)×(子)'=802436分PX=2)=C×(号)×(号)'=243分P(X=3)=C×(3))'×(号)广-2438分P(X=4)=C×(号)'×号=2439分P(X=5)=C×(3)=2310分随机变量X的分别列为:X0123453280804010P124324324324324324311分5E(X)=5X312分3
【语篇导读】本文是夹叙夹议文告诉我们远亲不如近邻”的道理8.A【解析】细节理解题。根据第一段 Much moreprobably it is a close female friend calling to tell you thatshe has split up with her boyfriend again or perhaps sim-ply that a good movie has just started.onTv.可知最有可能来自一个朋友,故选A。9.C【解析】细节理解题。根据第三段 TV shows likethis tell us that our romantic relationships may not lastbut we need to keep in touch with our close friends if wewant to survive.可知 TV shows like Friends告诉我们亲密的朋友帮助我们面对生活中的困难。故选C。10.D【解析】推理判断题。根据最后一段 This is trueof Erika and Jane 's friendship. With Erikas family200 miles away, it is Jane who keeps a spare set of keysto Erika's apartment and waters her plants whenevershe is away.可知Bika和Jane在日常生活中互相信任和支持。故选D。解析】推理判断题。纵观全文,特别是最后一My friends have more to do with my life than, my par-ts and, therefore, I don't have to spend a lot of timeexplaining things to them. Friends are more up to dateith what is happening可知远亲不如近邻。故选A。