题目

（本小题满分12分）某人向一目射击4次，每次击中目标的概率为。该目标分为3个不同的部分，第一、二、三部分面积之比为1：3：6。击中目标时，击中任何一部分的概率与其面积成正比。（Ⅰ）设X表示目标被击中的次数，求X的分布列；（Ⅱ）若目标被击中2次，A表示事件“第一部分至少被击中1次或第二部分被击中2次”，求P（A）        It was the night before the composition was due. As I looked at the list of topics(题目), “The Art of Eating Spaghetti(意大利面条)” caught my eye. The word “spaghetti” brought back the 1 of an evening at Uncle Alien’s in Belleville 2all of us were seated around the table and Aunt Pat 3 spaghetti for supper. Spaghetti was an exotic(外来的) treat in 4days. Never had I eaten spaghetti, and 5 of the grown-ups had enough experience to be6it. What laughing 7 we had about the8respectable method for moving spaghetti from plate to mouth. 9, I wanted to write about that, but I wanted to 10 it down simply for my own 11, not for Mr. Fleagle, my composition teacher. 12, I would write something else. When I finished it the night was half gone and there was no 13 left to write a proper com­position for Mr. Fleagle. There was no choice next morning but to 14my work. Two days pas­sed before Mr. Fleagle returned the 15 papers. He said, “Now, class, I want to read you a composition, ‘The Art of Eating Spaghetti’. ”My words! He was reading my words out 16 to the whole class. 17 laughed, then the whole class was laughing with open-hearted enjoyment. I did my best not to show18, but what I was feeling was pure happiness, 19 my words had the power to make people20.1.A.memoryB.thoughtC.knowledgeD.experience2.A.whenB.whereC.sinceD.after3.A.cookedB.servedC.gotD.made4.A.theirB.pastC.lastD.those5.A.noneB.oneC.earnsD.neither6.A.careful aboutB.good atC.fond ofD.interested in7.A.speechesB.lessonsC.sayingsD.arguments8.A.nearlyB.naturallyC.officiallyD.socially9.A.EspeciallyB.ProbablyC.SuddenlyD.Fortunately10.A.settleB.putC.biteD.let11.A.workB.storyC.luckD.joy12.A.HoweverB.ThereforeC.As for himD.Except for that13.A.timeB.excuseC.wayD.idea14.A.give upB.continueC.hand inD.delay15.A.writtenB.gradedC.collectedD.calmly16.A.laidB.fastC.publiclyD.calmly17.A.PeopleB.NobodyC.SomebodyD.I18.A.shockB.wonderC.worryD.pleasure19.A.ifB.forC.whileD.although20.A.excitedB.satisfiedC.thinkD.laugh