2015年秋季入学测试笔试《专升本理科》复习资料 A卷

河南省2015年普通高等学校 专科毕业生进入本科阶段学习考试高等数学一、选择题（每小题2分，共60分）在每小题的四个备选答案中选出一个正确答案，用铅笔把答题卡上对应题目的答案标号涂黑。

1．已知函数()f x x =，则1f f x ⎡⎤⎛⎫= ⎪⎢⎥⎝⎭⎣⎦（ ）A ．xB ．2xC ．1xD ．21x 【答案】C【解析】因为()f x x =，则11f x x⎛⎫= ⎪⎝⎭，所以111f f f x x x ⎡⎤⎛⎫⎛⎫== ⎪ ⎪⎢⎥⎝⎭⎝⎭⎣⎦．2．已知函数84()f x x x =-，则()f x 是（ ）A ．奇函数B ．偶函数C ．非奇非偶函数D ．无法判断【答案】B【解析】()()8484()()f x x x x x f x -=---=-=，即()f x 为偶函数．3．已知函数12()f x x =，则()f x 的定义域是（ ）A ．(0,)+∞B ．[0,)+∞C ．(,0)-∞D ．(,0]-∞【答案】B【解析】由12()f x x ==()f x 的定义域是[0,)+∞．4．已知极限0sin()lim 2x mx x→=，则可确定m 的值是（ ）A ．1B ．2C ．12D ．0【答案】B【解析】00sin()lim lim 2x x mx mxm xx →→===．5．当0x →时，若212cos ~2a x x -，则可确定a 的值一定是（ ）A ．0B ．1C ．12 D ．12-【答案】C【解析】由()212cos ~02a x x x -→，可知()2001lim 2cos lim 2x x a x x →→-=，即2cos00a -=，故12a =．6．下列极限存在的是（ ）A ．21limx x x →∞+B ．01lim21x x →-C ．01lim x x→D．x 【答案】A【解析】22111lim lim 01x x x x x x →∞→∞++==，极限存在；01lim 21xx →=∞-，极限不存在；01lim x x→=∞，极限不存在；x x =∞，极限不存在．7．已知函数sin ,0()1,0a xx f x x x ⎧≠⎪=⎨⎪=⎩，在0x =处，下列结论正确的是（ ）A ．1a =时，()f x 必然连续B ．0a =时，()f x 必然连续C ．1a =时，()f x 不连续D ．1a =-时，()f x 必然连续【答案】A【解析】00sin lim ()limx x a xf x a x→→==，又知(0)1f =，故1a =时，()f x 必连续．8．极限30sin lim sin x x xx →-的值是（ ）A ．16B ．13C ．0D ．∞【答案】A【解析】2332200001sin sin 1cos 12lim lim lim lim sin 336x x x x xx x x x x x x x x →→→→---====．9．已知函数()()()f x x a g x =-，其中()g x 在点x a =处可导，则()f a '=（ ）A ．0B ．'()g aC ．()g aD ．()f a【答案】C 【解析】00()()()0()limlim ()x x f a x f a xg a x f a g a x x→→+-+-'===．10．已知曲线2()f x x =与3()g x x =，当它们的切线相互垂直时，自变量x 的值应为（ ）A ．1-B． C ．16-D【答案】B【解析】()2f x x '=，2()3g x x '=，两曲线的切线相互垂直，即()()1f x g x ''⋅=-，即2231x x ⋅=-，即x =11．已知函数()f x x =，则该函数()f x 在点0x =处（ ） A ．连续且可导 B ．不连续C ．连续但不可导D ．左右导数均不存在【答案】C【解析】00lim ()lim 0(0)x x f x x f →→===，故()f x 在0x =处连续； 00()(0)(0)lim lim 1x x f x f x f x x ---→→--'===-，00()(0)(0)lim lim 1x x f x f xf xx +++→→-'===，故()f x 在0x =处不可导．12．已知函数()cos f x x =在闭区间[]0,2π上满足罗尔定理，那么在开区间(0,2)π内使得等式'()0f ξ=成立的ξ值是（ ）A ．2πB ．πC ．0D ．2π【答案】B【解析】()cos f x x =，()sin f x x '=-，令()sin 0f x x '=-=，02x π<<，可得x π=，即ξπ=．13．已知函数()f x 在邻域(,)δδ-内连续，当(,0)x δ∈-时，'()0f x <，当(0,)x δ∈时，'()0f x >，则在邻域(,)δδ-内（ ）A ．(0)f 是极小值B ．(0)f 是极大值C ．(0)f 不是极值D ．(0)f 是最大值【答案】A【解析】由题可知()f x 在(,0)δ-上单调减少，在(0,)δ上单调增加，又由()f x 在(,)δδ-内连续，可知()f x 在0x =处取得极小值．14．已知函数()f x 在开区间(,)a b 内有：'()0f x <且"()0f x >，则在开区间(,)a b 内，()f x 是（ ） A ．单调递减且形状为凸 B ．单调递增且形状为凸C ．单调递减且形状为凹D ．单调递增且形状为凹【答案】C【解析】'()0f x <，说明()f x 在(,)a b 内单调递减，"()0f x >，说明()f x 在(,)a b 内为凹函数．15．已知曲线52y x =+，则该曲线的拐点(,)x y =（ ）A ．(0,2)B ．(1,3)C ．(0,0)D ．(1,1)-【答案】A【解析】45y x '=，320y x ''=，令0y ''=，得0x =，且0x <时0y ''<，0x >时0y ''>，故(0,2)为曲线的拐点．16．已知函数()F x 是()f x 的一个原函数，则不定积分(2)f x dx =⎰（ ）A ．1()2F x C +B ．1(2)2F x C +C ．()F x C +D ．(2)F x C +【答案】B【解析】11(2)(2)(2)(2)22f x dx f x d x F x C ==+⎰⎰．17．已知函数0()sin xf x t tdt =⎰，则'()f x =（ ）A ．sin xB ．cos x xC ．cos x x -D ．sin x x【答案】D 【解析】()'()sin sin xf x t tdt x x '==⎰．18．已知函数()f x 在闭区间[,]a a -上连续，则定积分4sin aa x xdx -=⎰（ ）．A ．-1B ．0C ．1D ．不确定【答案】B【解析】由于被积函数4sin x x 为奇函数，故4sin 0aa x xdx -=⎰．19．已知定积分1210I x dx =⎰，1320I x dx =⎰，则有（ ）A ．12I I >B ．12I I =C ．12I I <D ．不确定【答案】A【解析】当01x ≤≤时，23x x >，且等号只在端点处成立，故112300x dx x dx >⎰⎰，即12I I >．20．已知函数()y f x =在闭区间[,]a a -上连续，且()0f x ≥，则由曲线()y f x =与直线x a =，x b =，0y =所围成的平面图形的面积是（ ）A ．()baf x dx ⎰B ．()abf x dx ⎰C ．()()()f b f a b a --D ．不确定【答案】A【解析】由定积分的几何意义可知A 正确．21．已知下列微分方程，则可进行分离变量的是（ ） A ．'3sin xy y x -= B ．2(cos )()0x y x dy y x dx -++=C ．'sin cos y x y =D ．'420yy y x -==【答案】C 【解析】C 中sin cos dyx y dx=，分离变量，得sin cos dy xdx y =．22．已知微分方程''5'0y y ay -+=的一个解为2x e ，则常数a =（ ）A ．4B ．3C ．5D ．6【答案】D【解析】22()2x x e e '=，22()4x x e e ''=，代入微分方程，得2224520x x x e e ae -⨯+=，6a =．23．下列各组角中，可以作为向量的一组方向角的是（ ）A ．,,446πππB ．,,432πππC ．,,434πππD ．,,433πππ【答案】D【解析】由于方向角α，β，γ必须满足222cos cos cos 1αβγ++=，可以验证只有D 正确．24．已知函数2223z x xy y =+-，则2zx y∂∂∂=（ ）A ．2-B ．2C ．6D ．3【答案】D【解析】43zx y x∂=+∂，23z z x y y x ∂∂∂⎛⎫== ⎪∂∂∂∂⎝⎭．25．某公司要用铁板做成一个容积为327m 的有盖长方体水箱，为使用料最省，则该水箱的最小表面积应为（ ）A ．354mB ．327mC ．39mD ．36m【答案】A【解析】设长方形的长宽分别为a 、b ，则高为27ab，于是，表面积2727545422S ab ab b a b a ⎛⎫=++=++ ⎪⎝⎭，令2254205420S b a a S a bb ∂⎧=-=⎪⎪∂⎨∂⎪=-=⎪∂⎩，得33a b =⎧⎨=⎩，且驻点唯一，由于实际问题最值一定存在，可知最小表面积354S m =．26．已知平面闭区域22:116D x y ≤+≤，则二重积分3Ddxdy =⎰⎰（ ）A ．45πB ．45C ．48πD ．48【答案】A【解析】22333(41)45D Ddxdy S πππ==⋅-⋅=⎰⎰．27．已知100(,)(,)Df x y d dx f x y dy σ=⎰⎰⎰，将积分次序改变，则(,)D f x y d σ=⎰⎰（ ）A ．2110(,)y dy f x y dx ⎰⎰ B ．2101(,)y dy f x y dx ⎰⎰C ．2110(,)y dy f x y dx ⎰⎰D ．2011(,)y dy f x y dx ⎰⎰【答案】A【解析】2110(,)(,)D y f x y d dy f x y dx σ=⎰⎰⎰⎰．28．已知L 为连接(1,0)及(0,1)两点的直线段，则曲线积分()L x y ds +=⎰（ ）A ．2BC ．1D ．0【答案】B【解析】由于直线段L 的方程为1x y +=，故()Lx y ds +==⎰⎰29．下列级数绝对收敛的是（ ）A ．1(1)nn ∞=-∑B ．111(1)3n n n n ∞--=-∑ C ．1(1)sinnn nπ∞=-∑D ．2112(1)!xn n n ∞+=-∑ 【答案】B【解析】对于B 项，121(1)3n n nu --=-，111113lim lim lim 1333n n n n n nn n u n n u n +→∞→∞→∞-++===<，故1n n u ∞=∑收敛，原级数绝对收敛．30．已知级数1n n μ∞=∑，则下列结论正确的是（ ）A ．若lim 0n x μ→∞=，则1n n μ∞=∑收敛 B ．若1n n μ∞=∑的部分和数列{}n S 有界，则1n n μ∞=∑收敛C ．若1n n μ∞=∑收敛，则1n n μ∞=∑绝对收敛D ．若1n n μ∞=∑发散，则1n n μ∞=∑也发散【答案】C【解析】A 项中若1n nμ=，结论不成立；B 项中若(1)n n μ=-，结论不成立；D 项中若1(1)nn nμ=-，结论不成立；由绝对收敛的定义知，C 正确．二、填空题（每小题2分，共20分）31．已知函数()1f x x =-，则()f x 的反函数y =________． 【答案】1y x =+【解析】由1y x =-，得1x y =+，交换x ，y 的位置，得反函数为1y x =+，x R ∈．32．极限21lim 31n n n →∞+=+________． 【答案】0【解析】222111lim lim 01313n n n n n n n →∞→∞++=++33．已知函数1,1()1,1x x f x x +≠⎧=⎨=⎩，则点1x =是()f x 的________间断点． 【答案】可去【解析】()11lim ()lim 12x x f x x →→=+=，而(1)1f =，故1x =是()f x 的可去间断点．34．已知函数()ln f x x =为可导函数，则()f x 在点 1.01x =处的近似值为________． 【答案】0．01【解析】由000()()()f x x f x f x x '+∆≈+∆，故(10.01)(1)(1)0.010.01f f f '+≈+⋅=．35．不定积分cos(32)x dx +=⎰________． 【答案】1sin(32)3x C ++【解析】11cos(32)cos(32)(32)sin(32)33x dx x d x x C +=++=++⎰⎰．36．定积分0sin 2xdx π=⎰________．【答案】2 【解析】000sin 2sin 2cos22222x x x x dx d πππ==-=⎰⎰．37．已知函数22ln()z x y =+，则全微分(1,1)dz =________．【答案】dx dy +【解析】222z x x x y ∂=∂+，222z y y x y ∂=∂+，则(1,1)(1,1)(1,1)222222xy dz dx dy dx dy x y x y =+=+++．38．与向量{}3,4,1-平行的单位向量是________．【答案】± 【解析】=±=±e ．39．微分方程'x y y e -=的通解是________． 【答案】ln()x y e C =+【解析】xy dy e dx e=，分离变量，得y x e dy e dx =，两边积分，得y x e e C =+，即通解为ln()x y e C =+．40．幂级数1(21)nn n x ∞=+∑的收敛半径R =________．【答案】1 【解析】121lim lim 123n n n na n R a n +→∞→∞+===+．三、计算题（每小题5分，共50分） 41．求极限1lim(1sin )xx x →∞+．【答案】e【解析】原式111sin lim sin sin lim(1sin )x x x x xxx x ee →∞⋅⋅⋅→∞=+==．42．已知函数()f x 为可导函数，且()0f x ≠，求函数y =【解析】[]121()()2y f x f x -''=⋅．43．计算不定积分21xdxx +⎰． 【答案】21ln(1)2x C ++【解析】原式()222111ln(1)212d x x C x +==+++⎰．44．计算定积分⎰【答案】1【解析】11111t t tt te dt tde te e dt ===-=⎰⎰⎰⎰．45．求过点(1,2,1)A ，且与直线240:320x y z l x y z -+=⎧⎨--=⎩平行的直线方程． 【答案】1219710x y z ---== 【解析】所求直线的方向向量为()2419,7,10312=-=--i j ks ，又直线过点(1,2,1)A ，故所求直线方程为1219710x y z ---==． 46．已知函数(,)z f x y =由方程22240x y z z ++-=所确定，求全微分dz ． 【答案】2xdx ydy z+- 【解析】方程两边微分，得22240xdx ydy zdz dz ++-=，整理得2xdx ydy dz z +=-．47．计算二重积分22x y D e dxdy +⎰⎰，其中D 是环形域2214x y ≤+≤．【答案】()4e e π- 【解析】()222222224011122x y r r D edxdy d e rdr e dr e e πθππ+=⋅=⋅=-⎰⎰⎰⎰⎰．48．求微分方程'xy e y x x+=的通解． 【答案】()1x y e C x=+ 【解析】()()11ln ln 11x xdx dx x x x x x x e e y e e dx C e e dx C e dx C e C x x x x --⎛⎫⎛⎫⎰⎰=+=+=+=+ ⎪ ⎪⎝⎭⎝⎭⎰⎰⎰．49．求幂级数11(1)(1)n n n x n∞-=--∑的收敛区间． 【答案】(0,2) 【解析】11(1)lim lim 11(1)n n n n n nu x n x u n x ++→∞→∞-=⋅=-+-，令11x -<，得111x -<-<，即02x <<，故收敛区间为(0,2)．50．求级数11n n nx∞-=∑的和函数．【答案】()()211S x x =-，()1,1x ∈-【解析】易求得此级数的收敛域为()1,1-，设()11n n S x nx ∞-==∑，()1,1x ∈-，则11000111()1xxx n n n n n n x S t dt nt dt nt dt x x ∞∞∞--===⎛⎫==== ⎪-⎝⎭∑∑∑⎰⎰⎰，()1,1x ∈-，两边求导，得()()2111x S x x x '⎛⎫== ⎪-⎝⎭-，故原级数的和函数为()()211S x x =-，()1,1x ∈-．四、应用题（每小题7分，共14分）51．计算由曲线0x =，x y e =，y e =所围成的平面图形的面积．【答案】1【解析】所求平面图形的面积()101x S e e dx =-=⎰．52．某公司主营业务是生产自行车，而且产销平衡，公司的成本函数3()400002000.002C x x x =+-，收入函数3()3500.004R x x x =-，则生产多少辆自行车时，公司的利润最大？【答案】37500【解析】公司的利润22()()()3500.004400002000.002L x R x C x x x x x =-=---+21500.00240000x x =--，1500.004L x '=-，令0L '=，得唯一驻点37500x =，且0L ''<，由实际问题知最大值一定存在，故37500x =时，L 取得最大值，即生产37500辆自行车时，公司利润最大．五、证明题（6分）53．已知方程11730x x x x --+=有一正根1x =，证明方程1062117310x x x --+=必有一个小于1的正根．【证明】令1173()f x x x x x =--+，则根据题意可知(1)0f =，因为()f x 在[]0,1上连续，在()0,1内可导，且(0)(1)0f f ==，故由罗尔定理可知：()0,1ξ∃∈，使得()0f ξ'=，即1062117310ξξξ--+=，故方程1062117310x x x --+=必有一个小于1的正根．。

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不按上要求作答的答案无效。

第I卷第一部分：听力理解( 本大题共20小题，每小题1分，共20分)Part I Listening ComprehensionSection ADirections:In this section you will hear 8 short conversations and 2 long conversations.At the end of each conversation,one or more questions will be asked about what was said.Both the conversation and the questione will be spoken only once.Short Conversations1. A) John’s cottage is similar to Paul’s.B)John’s cottage is much newer than Paul’s.C)John’s cottage is much older than Paul’s.D)John’s cottage is as old as Paul’s.2. A) 55 minutes B) 40 minutes. C) 45 minutes. D) 35 minutes.3. A) Watch TV at home. B) Eat in a restaurant and then see a movie.C) Go anywhere D) Prepare for tomorrow’s exam.4. A) A shop assistant. B)A post office clerk.C) A waitress. D) An air stewardess.5. A) Going to New Mexico. B) Going to the wedding party.C)Going to Arizona. D)Going to the museum.6. A) A repairman. B) A doctor. C)A salesman. D) A postman.7. A) In a hotel. B)At a reception desk.C) At a supermarket. D)At a tailor’s shop.8. A) The woman isn't sure when the train will arrive.B) The train was caught in an accident.C) The train may arrive at 9:15.D) The train will not arrive.Long Conversation 1Questions 9 to 12 are based on the conversation you have just heard.9. A) To ask for advice B) To blame the doctor.C) To chat with a friend. D) To make an appointment.10. A) Parents should tell their kids honesty is vital.B) Parents should set a good model.C) Parents should value honesty a lot.D) Parents should praise their kids for telling the truth.11. A) Open up a dialogue B) Ask them why they have lied.C) Place blame. D) Acknowledge their feelings.12. A) Keep a cool head in the first place.B) Tell them if they lie again, they will be punished.C) Punish their children.D) Tell them you don’t believe them any more.Long Conversation 2Questions 13 to 14 are based on the conversation you have just heard.13. A) She didn’t help John in the test.B) Professor Smith talked to her about her score.C)She told Professor Smith that John cheated in the test.D)She failed in the economics test.14. A)John cheated in the test.B)George passed the economics test.C)The woman failed in the economics test.D)Professor Smith knew that somebody cheated in the test.Section BDirections: In this section, you will hear 2 passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you heara question, you must choose the best answer from the four choices marked A), B), C) and D).Then mark the corresponding letter on the Answer Sheet with a single line through thecenter.Passage One 1Questions 15 to 17 are based on the passage you have just heard.15. A) Starting a family. B) Table manners. C) Growing up. D) Dining out.16. A)It was the first time he was called “Mister”.B)It was the first time his parents treated him as an adult.C)It was the first time he behaved as an adult before his parents.D)It was the first time he took his parents out for dinner.17. A) Parents usually regard their children as grown-ups when they reach 13.B)The waiter usually places the bill in the middle of the table.C)The speaker’s father used to pay their restaurant bills.D)The family used to go to a restaurant for dinner when they got together.Passage TwoQuestions 18 to 20 are based on the passage you have just heard.18. A) Relatives. B) Former classmates. C) Neighbors. D) Colleagues.19. A) When Rhonda invited her to tea.B)When the speaker took Rhonda to a movie.C)When they visited the zoo together.D)When they took a trip abroad together. 20. A) When Rhonda shared joy in her accomplishments.B)When Rhonda came to her help when she was in need.C)When she gave up her plans to help Rhonda.D)When she refused to take Rhonda's advice.Part II Vocabulary and StructureDirections:There are 30 incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the center.21. She tries her best to ____the changes in fashion.A) keep up with B) put off C) come up with D) go by22. If you try to learn too many things at a time, you may get____.A) troubled B) mistaken C) confused D) interfered23. We can ____with people in most parts of the world by telephone.A) communicate B) tell C) relate D)connect24. The book tells us about the author’s life _____about his writings.A) also B)as much as C) as well as D) as well25. I got a splitting headache. It kept me ____the whole night.A) waken B) aware C)awake D) waking26. I'd like to ____ a special seat for the concert of May 5.A) serve B) reserve C) preserve D) conserve them27. The students of this university complain about traffic noises which _____when they are having classes.A) disturb B) interrupt C) prevent D) interfere28. Mary ______ her bag at the first sight by seeing its color.A) identified B) told C)knew D)claimed29. The picture _____ me of the days when I spent my childhood in the countryside.A) reminded B) collected C) remembered D) recalled30. Over the years my father had gradually ______ a collection of precious stamps.A) collected B) gathered C)accumulated D)absorbed31. It was hard work, but they _____to it and got the job done.A) adjust B)follow C)continue D)stuck32. This article ______ more attention to the problem of cultural interference in foreign language teaching and learning.A)calls for B) allows for C) cares for D) applies for33. Although buses are ______to depart at a certain hour, they are often late.A) scheduled B) obligated C) requested D) loaded34. What _____ to him is whether the job allows him to pursue his studiesA) matters B)happens C)refers D)applies35. A smart appearance makes a ______impression at an interview.A) favorable B)favored C)favorite D)favoring36. Mary _____ like to surf the Internet. She often spends hours on line.A) did B)does C)do D)is37. She pretended not ______ indifferent but her facial expression betrayed her.A) to be B) being C) be D) been38. We have to get the road repaired ______ .A)no matter how much does it costB)no matter how much costs itC)no matter how much it costsD)no matter it costs how much39. She said that the doctor must have got stuck in a traffic jam; otherwise he______ by then.A) would arrive B) would have arrivedC) should arrive D) must have arrived40. Mr. Smith insisted that the work ______ finished by the end of April.A) be B) had been C) was D) were41. The person ________ I complained is the supervisor.A) whom B) to whom C) who D) to who42. Dr. John _____ be in Paris because I met him in town just now.A) may B) can’t C) might not D) may not43. Michael liked the carving very much, which cost him $2 000. However, he would gladly have paid _______for it.A) as twice much B)much as twiceC) as much twice D)twice as much44. Only when she had accomplished the task_______that she had made a mistake.A) did she realize B) she then realizedC) she realized D) before she realize45. I find it hard to imagine a time when _______to solve.A) no problems will be there B) there will be no problemsC) no problems there will be D) there no problems will be46. When we arrived at the airport, the plane _______ .A) already took off B) took off alreadyC) had already taken off D) has already taken off47. “Would you like to go out for a picnic?” “Yes, it’s _____ day!”A) so a beautiful B) so beautifulC) such beautiful D) such a beautiful48. She grabbed me _______and pulled me out of the taxi.A) a arm B) an arm C) by the arm D) the arm49. I know Mike is slow at understanding, but we should be patient _______ him.A) for B) with C) at D) about50. He is studying diligently________ he should fall behind.A) for fear that B) so that C) unless D) before第三部分：阅读理解（本大题共20小题，51一60小题，每小题2 分；61一62 小题，每小题3分，共30分）Part ⅢReading ComprehensionSection ADirections:There are 3 passages in this part. Each passage is followed by some questions or unfinished statements. Choose the, best answer and mark the corresponding letter on the Answer Sheet with a single line through the center.Passage OneMany a young person tells me he wants to be a writer. I always encourage such people, but I also explain that there's a big difference between being a writer and writing. In most cases theseindividuals are dreaming of wealth and fame，not the long hours alo ne at a typewriter. “You’ve got to want to write,” I say to them, “not want to be a writer.”The reality is that writing is a lonely, private and poor-paying affair. For every writer kissed by fortune there are thousands more whose longing is never rewarded. When I left a20-year career in the U.S. Coast Guard to become a freelance writer, I had no prospects at all.What I did have was a friend who found for me my room in a New York apartment building. It didn't even matter that it was cold and had no bathroom. I immediately bought a used manual typewriter and felt like a genuine writer.After a year or so, however, I still hadn't got a break and began to doubt myself. It was so hard to sell a story that I barely made enough to eat. But I knew I wanted to write. I had dreamed about it for years. I wasn't going to be one of those people who died wondering. What if I would keep putting my dream to test (even though it meant living with uncertainty and fear of failure). This is the shadow-land of hope, and anyone with a dream must learn to live there.51. The passage is meant to _______ .A) warn young people of the hardships that a successful writer has to experienceB) encourage young people to pursue a writing careerC) show young people it is unrealistic for a writer to pursue wealthD) advise young people to give up their idea of becoming a professional writer52. What can be concluded from the passage?A) A writer’s success depends on luck rather than on effort.B) Genuine writers often find their work interesting and rewarding.C) Famous writers usually live in poverty and isolation.D) The chances for writers to become successful are small.53. Why did the author begin to doubt himself after the first year of his writing career?A) He found his dream would never come true.B) He hadn't seen a change for the better.C) He wasn't able to have a rest for a whole year.D) He was not able to produce a single book.54. In Line 13“...people who died wondering”，“who” refers to those .A) who think a lot without making a decisionB) who regret giving up their career halfwayC) who think too much of the dark side of lifeD) who are full of imagination even upon deathPassage TwoStudents can travel in the United States without spending too much money if they follow these suggestions.A travel agent can give you information on special economy fares for trains, buses and planes. Think about hiking or biking for a part of your trip, too. You‘ll not only save money, but you'll also see a lot more of the country.Some students may want to travel by car. Be sure to think about going with other students —many colleges have '‘ride boards” that list when and where other students plan to travel. Many radio stations provide the same, sort of service —they announce who’s driving where, when,how many riders they will take and what the expenses will be.There are many inexpensive, older hotels near bus or train stations. Check your travel guide for names of the best. Many parts of the country also have youth hostels where young people can stay for only a few dollars a night.You don't have to eat in restaurants all the time, but we don?t recommend a diet of candy and cola, either. You can usually get a healthy, cheap breakfast in a restaurant. If the weather is warm, you can buy food in supermarkets or at roadside stands and have a picnic for lunch. For dinner you can get the names of good, cheap restaurants from travel guides or friends.55. The passage tells students ______ .A) how to get help while travelingB) how to make travel plansC) how to use less money while travelingD) how to choose hotels56. To see more of the country, you’d better travel ______ .A) by plane B) by train C) by bus D) by bike57. According to the passage, staying at youth hostels is ________ .A) cheap B) enjoyable C) comfortable D) convenient58. To save money, you can _______ .。

湖北文理专升本试题及答案考生须知：1. 本试卷共包含100分，考试时间为120分钟。

2. 请在答题卡上用黑色签字笔填写姓名和考号。

3. 所有答案必须写在答题卡上，写在试卷上的答案无效。

一、选择题（每题2分，共20分）1. 下列哪个选项是湖北文理学院的简称？A. 湖文理B. 湖理工C. 湖文院D. 湖理院答案：A2. 湖北文理学院位于哪个城市？A. 武汉B. 襄阳C. 宜昌D. 荆州答案：B3. 专升本是指什么？A. 专科生升本科B. 本科生升硕士C. 硕士生升博士D. 中学生升专科答案：A4. 以下哪个不是专升本考试的科目？A. 语文B. 数学C. 英语D. 体育答案：D5. 专升本考试通常在每年的哪个月份进行？A. 1月B. 3月C. 6月D. 9月答案：C（此处省略其他选择题，共10题）二、填空题（每空1分，共10分）1. 湖北文理学院的校训是“厚德、______、求实、创新”。

答案：博学2. 专升本考试通常由______组织。

答案：各省教育考试院3. 专升本考试的报名条件之一是必须具有______学历。

答案：全日制专科（此处省略其他填空题，共5空）三、简答题（每题10分，共20分）1. 请简述专升本考试的目的。

答案：专升本考试的目的在于为专科生提供一个继续深造的机会，通过考试选拔优秀专科生进入本科阶段学习，以提高个人学历和专业素养。

2. 专升本考试通常包含哪些科目？答案：专升本考试通常包含语文、数学、英语等基础科目，以及根据专业不同设置的专业科目。

四、论述题（每题15分，共30分）1. 论述专升本考试对于个人发展的意义。

答案：专升本考试对于个人发展具有重要意义。

首先，它为专科生提供了一个提升学历的平台，有助于个人职业发展和晋升。

其次，通过专升本考试进入本科学习，可以拓宽知识面，增强专业能力。

最后，专升本考试也是对个人学习能力和自我管理能力的一次考验，有助于培养终身学习的习惯。

2. 论述湖北文理学院专升本考试的报名流程。

绝密★启用前 2015年普通高等学校招生全国统一考试(全国新课标卷1)数学（理科）使用地区：河南、山西、河北、江西本试卷分第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分.满分150分，考试时间120分钟.第Ⅰ卷（选择题 共60分）一、选择题：本大题共12小题，每小题5分，共60分.在每小题给出的四个选项中，只有一项是符合题目要求的.1．设复数z 满足1+z1z-=i ，则|z|=（ ） A ．1B ．2C ．3D ．2 2．sin20cos10cos160sin10︒︒︒︒-=（ ）A ．32-B ．32C ．12-D ．123．设命题:p n ∃∈Ν，22n n ＞，则⌝p 为（ ）A ．2n n n ∀∈N 2，＞B ．2n n n ∃∈N 2，≤C ．2n n n ∀∈N 2，≤D ．=2n n n ∃∈N 2，4．投篮测试中，每人投3次，至少投中2次才能通过测试.已知某同学每次投篮投中的概率为0.6，且各次投篮是否投中相互独立，则该同学通过测试的概率为（ ）A ．0.648B ．0.432C ．0.36D ．0.3125．已知00()M x y ,是双曲线2212x C y -=：上的一点，F 1，F 2是C 的两个焦点.若120MF MF <，则0y 的取值范围是（ ）A ．33()33-， B ．33()66-， C ．2222()33-， D ．2323()33-， 6． 《九章算术》是我国古代内容极为丰富的数学名著，书中有如下问题：“今有委米依垣内角，下周八尺，高五尺.问：积及为米几何?”其意思为：“在屋内墙角处堆放米(如图，米堆为一个圆锥的四分之一)，米堆底部的弧长为8尺，米堆的高为5尺，问米堆的体积和堆放的米各为多少?”已知1斛米的体积约为1.62立方尺，圆周率约为3，估算出堆放的米约有（ ）A ．14斛B ．22斛C ．36斛D ．66斛 7．设D 为ABC △所在平面内一点，=3BC CD ，则（ ）A ．1433AD AB AC =-+ B ．1433AD AB AC =- C ．4133AD AB AC =+ D ．4133AD AB AC =-8．函数=cos(+)x f x ωϕ()的部分图象如图所示，则f x ()的单调递减区间为（ ）A ．13π,π+44k k k -∈Z （）,B ．132π,2π+44k k k -∈Z （）,C ．13,+44k k k -∈Z （）,D ．132,2+44k k k -∈Z （）,9．执行如图所示的程序框图，如果输入的0.01t =，则输出 的n =（ ）A ．5B ．6C ．7D ．810．25()x x y ++的展开式中，52x y 的系数为（ ）A ．10B ．20C ．30D ．6011．圆柱被一个平面截去一部分后与半球(半径为r )组成一个几何体，该几何体三视图中的正视图和俯视图如图所示.若该几何体的表面积为16＋20π，则r =（ ）A ．1B ．2C ．4D ．812．设函数()()21x f x e x ax a ＝－－＋，其中a<1，若存在唯一的整数0x 使得0()0f x <，则a 的取值范围是（ ）--------在--------------------此--------------------卷--------------------上--------------------答--------------------题--------------------无--------------------效----------------姓名________________ 准考证号_____________A ．3[)21,e-B ．43[,)23e -C ．3[,)234e D ．3[,)21e第Ⅱ卷（非选择题 共90分）本卷包括必考题和选考题两部分.第13～21题为必考题，每个试题考生都必须作答.第22～24题为选考题，考生根据要求作答.二、填空题：本大题共4小题，每小题5分，共20分.把答案填在题中的横线上. 13．若函数2()=()ln f x x a x x +＋为偶函数，则a =________. 14．一个圆经过椭圆22=1164x y+的三个顶点，且圆心在x 轴的正半轴上，则该圆的标准方程为________.15．若x ，y 满足约束条件10,0,40,x x y x y -⎧⎪-⎨⎪+-⎩≥≤≤则y x 的最大值为________.16．在平面四边形ABCD 中，==75=A B C ∠∠∠︒，=2BC ，则AB 的取值范围是________. 三、解答题：本大题共6小题，共70分.解答应写出必要的文字说明、证明过程或演算步骤. 17．（本小题满分12分）n S 为数列{}n a 的前n 项和.已知0n a >，2n n n +2=4+3a a S .（Ⅰ）求{}n a 的通项公式；（Ⅱ）设n n n+11=b a a ，求数列{}n b 的前n 项和．18．（本小题满分12分）如图，四边形ABCD 为菱形，∠ABC =120°，E ，F 是平面ABCD 同一侧的两点，BE ⊥平面ABCD ，DF ⊥平面ABCD ，BE =2DF ，AE ⊥EC . （Ⅰ）证明：平面AEC ⊥平面AFC ； （Ⅱ）求直线AE 与直线CF 所成角的余弦值.19．（本小题满分12分）某公司为确定下一年度投入某种产品的宣传费，需了解年宣传费x (单位：千元)对年销售量y (单位：t )和年利润z(单位：千元)的影响，对近8年的年宣传费i x 和年销售量i y (i ＝1，2，…，8)数据作了初步处理，得到下面的散点图及一些统计量的值.xyω28i=1()ixx -∑28i=1()iωω∑-8i=1()()iiy x x y-∑-8i=1()()ii y y ωω--∑46.65636.8289.8 1.6 1 469108.8表中i ω=i x ，ω=188i i=1ω∑（Ⅰ）根据散点图判断，y a bx =＋与y c d x =＋哪一个适宜作为年销售量y 关于年宣传费x 的回归方程类型？（给出判断即可，不必说明理由）（Ⅱ）根据（Ⅰ）的判断结果及表中数据，建立y 关于x 的回归方程；（Ⅲ）已知这种产品的年利率z 与x ，y 的关系为z=0.2y －x .根据（Ⅱ）的结果回答下列问题：（i ）年宣传费x =49时，年销售量及年利润的预报值是多少？ （ii ）年宣传费x 为何值时，年利润的预报值最大？附：对于一组数据11()u v ,，22(,)u v ，…，(,)n n u v ，其回归直线v u αβ=+的斜率和截距的最小二乘估计分别为121()(),()nii i nii uu v v v u uu βαβ==--==--∑∑.20．（本小题满分12分）在直角坐标系xOy 中，曲线24C y x ：=与直线)0(l y kx a a >：=＋交于M ，N 两点.（Ⅰ）当k =0时，分别求C 在点M 和N 处的切线方程；（Ⅱ）y 轴上是否存在点P ，使得当k 变动时，总有∠OPM =∠OPN ？说明理由.21．（本小题满分12分）已知函数31()4f x x ax =++，()ln g x x =-. （Ⅰ）当a 为何值时，x 轴为曲线()y f x =的切线；（Ⅱ）用min{,}m n 表示m ，n 中的最小值，设函数()min{(),()}h x f x g x =(0)x >，讨论()h x 零点的个数.请考生在第22～24三题中任选一题作答，如果多做，则按所做的第一题记分. 22．（本小题满分10分）选修4—1：几何证明选讲如图，AB 是O 的直径，AC 是O 的切线，BC 交O 于点E . （Ⅰ）若D 为AC 的中点，证明：DE 是O 的切线； （Ⅱ）若OA =3CE ，求∠ACB 的大小.23．（本小题满分10分）选修4—4：坐标系与参数方程在直角坐标系xOy 中，直线1C ：x =－2，圆2C ：(x －1)2＋(y －2)2=1，以坐标原点为极点，x 轴的正半轴为极轴建立极坐标系. （Ⅰ）求1C ，2C 的极坐标方程； （Ⅱ）若直线3C 的极坐标方程为()π4θρ=∈R ，设2C 与3C 的交点为M ，N ，求2C MN △的面积.24．（本小题满分10分）选修4—5：不等式选讲已知函数12f x =|||x |x a -＋-（），0a >. （Ⅰ）当=1a 时，求不等式1f x >（）的解集；（Ⅱ）若f x （）的图象与x 轴围成的三角形面积大于6，求a 的取值范围. 2015年普通高等学校招生全国统一考试(全国新课标卷1)数学（理科）答案解析第Ⅰ卷一、选择题 1.【答案】A 【解析】由1=i 1z z+-，得1i (1i)(1i)=i 1i (1i)(1i)z -+-+-===++-，故1z =，故选C ． 【提示】先化简复数，再求模即可． 【考点】复数的运算． 2.【答案】D【解析】原式1sin 20cos10cos20sin10sin302=+==，故选D ． 【提示】直接利用诱导公式以及两角和的正弦函数，化简求解即可． 【考点】三角函数的运算． 3.【答案】C【解析】命题的否定是：22n n n ∀∈≤N ，．【提示】根据特称命题的否定是全称命题即可得到结论． 【考点】命题． 4.【答案】A【解析】根据独立重复试验公式可得，该同学通过测试的概率为2233C 0.60.40.6=0.648.⨯+【提示】判断该同学投篮投中是独立重复试验，然后求解概率即可．【考点】概率． 5.【答案】A【解析】由题知12(F F ，，220012x y -=，所以222120000000(3,)(3,)331MF MF x y xy x y y =-----=+-=-<，解得0y <<，故选A ． 【提示】利用向量的数量积公式，结合双曲线方程，即可确定0y 的取值范围． 【考点】双曲线． 6.【答案】B【解析】设圆锥底面半径为r ，则116238,43r r ⨯⨯=⇒=所以米堆的体积为 2111632035,4339⎛⎫⨯⨯⨯⨯= ⎪⎝⎭故堆放的米约为320 1.6222,9÷≈故选B ． 【考点】圆锥体积．【提示】根据圆锥的体积公式计算出对应的体积即可． 7.【答案】A【解析】由题知1114()3333AD AC CD AC BC AC AC AB AB AC =+=+=+-=-+【提示】将向量AD 利用向量的三角形法则首先表示为AC CD +，然后结合已知表示为AC AC ，的形式．【考点】向量运算． 8.【答案】D【解析】由五点作图知，1π42,53π42ωϕωϕ⎧+=⎪⎪⎨⎪+=⎪⎩解得ππ,4ωϕ==，所以π()cos π,4f x x ⎛⎫=+ ⎪⎝⎭令2ππ2ππ,,4k x k k π<+<+∈Z 解得1322,,44k x k k -<<+∈Z故()f x 的单调递减区间为132,2,44k k k ⎛⎫-+∈ ⎪⎝⎭Z ，故选D ．【提示】由周期求出ω，由五点法作图求出ϕ，可得()f x 的解析式，再根据余弦函数的单调性，求得()f x 的减区间． 【考点】三角函数运算． 9.【答案】C【解析】执行第1次，0.01,1,t S ==10,0.5,2n m === 0.5,0.25,2mS S m m =-===1,0.50.01n S t ==>=，是，循环，执行第2次， 0.25,0.125,2mS S m m =-===2,0.250.01n S t ==>=，是，循环，执行第3次，0.125,0.0625,2mS S m m =-===3,0.1250.01n S t ==>=，是，循环，执行第4次，0.0625,0.03125,2mS S m m =-===4,0.06250.01n S t ==>=，是，循环，执行第5次，0.03125,0.015625,2mS S m m =-===5,0.031250.01n S t ==>=，是，循环，执行第6次，0.015625,0.0078125,2mS S m m =-===6,0.0156250.01n S t ==>=，是，循环，执行第7次，0.0078125,S S m =-=2mm =0.00390625=， 7,0.00781250.01n S t ==>=，否，输出7,n =故选C ．【提示】由题意依次计算，当7,0.00781250.01,n S t ==>=停止由此可得结论． 【考点】程序框图． 10.【答案】C【解析】在25()x x y ++的五个因式中，2个取因式中2x 剩余的3个因式中1个取x ，其余因式取y ，故52x y 的系数为212532C C C 30,=故选C ．【提示】利用展开式的通项进行分析，即可得出结论． 【考点】二项式展开式． 11.【答案】B【解析】由正视图和俯视图知，该几何体是半球和半个圆柱的组合体，圆柱和球的半径都是r ，圆柱的高为2r ，其表面积为222214ππ2π225π41620π2r r r r r r r r ⨯+⨯++⨯=+=+，解得r=2，故选B ．【提示】通过三视图可知该几何体是一个半球拼接半个圆柱，计算即可． 【考点】空间几何体的表面积． 12.【答案】D【解析】设()()e 21,,xg x x y ax a =-=-由题知存在唯一的整数0x ，使得0()g x 在直线y ax a =-的下方．因为()e (21)xg'x x =+，所以当12x <-时，'()0g x <，当12x >-，()0,g'x >所以当12x =-时，12min [()]2e g x -=-．当0x =时(0)1g =-，(1)e 0g =>，直线y ax a =-恒过(1,0)且斜率a ，故(0)1a g ->=-，且1(1)3e g a a --=-≥--，解得312ea ≤<，故选D ．【提示】设()()e 21,,xg x x y ax a =-=-，问题转化为存在唯一的整数0x 使得0()g x 在直线y ax a =-的下方，由导数可得函数的极值，数形结合可得(0)1a g ->=-且1(1)3e g a a --=-≥--，解关于a 的不等式组可得．【考点】带参函数．第Ⅱ卷二、填空题 13.【答案】1【解析】由题知ln(y x =是奇函数，所以22ln(ln(ln()ln 0x x a x x a +-=+-==，解得 1.a =【提示】由题意可得，()()f x f x -=，代入根据对数的运算性质即可求解 【考点】函数奇偶性．14.【答案】2232524x y ⎛⎫±+= ⎪⎝⎭【解析】设圆心为(,0)a ，则半径为4a -，则222(4)2,a a -=+解得32a =±， 故圆的标准方程为2232524x y ⎛⎫±+= ⎪⎝⎭．【提示】利用椭圆的方程求出顶点坐标，然后求出圆心坐标，求出半径即可得到圆的方程． 【考点】圆的标准方程． 15.【答案】3【解析】做出可行域如图中阴影部分所示，由斜率的意义知，yx是可行域内一点与原点连线的斜率，由图可知，点(1,3)与原点连线的斜率最大，故yx的最大值3.【提示】作出不等式组对应的平面区域，利用目标函数的几何意义，利用数形结合确定y x的最大值．【考点】线性规划问题．16.【答案】【解析】如下图所示：延长BACD ，交于点E ，则可知在△ADE 中，105DAE ∠=︒，45ADE ∠=︒，30,E ∠=︒∴设12AD x =，2AE x =，4DE x =，CD m =，2BC =，sin151m ⎫∴+︒=⎪⎪⎝⎭⇒m +=∴04x <<，而2AB m x +-,2x∴AB的取值范围是．【提示】如图所示，延长BACD ，交于点，设12AD x =，2AE x =，4DE x =，CD m =m +=AB 的取值范围． 【考点】平面几何问题． 三．解答题17.【答案】（Ⅰ）21n + （Ⅱ）11646n -+ 【解析】（Ⅰ）当1n =时，211112434+3a a S a +=+=，因为0n a >，所以1a =3，当2n ≥时，221122n n n n a a a a --+--=14343n n S S -+--=4n a ，即111()()2()n n n n n n a a a a a a ---+-=+，因为0n a >，所以1n n a a --=2，所以数列{}n a 是首项为3，公差为2的等差数列，所以n a =21n +； （Ⅱ）由（1）知，1111(21)(23)22123n b n n n n ⎛⎫==- ⎪++++⎝⎭，所以数列{}n b 前n 项和为121111111=235572123n b b b n n ⎡⎤⎛⎫⎛⎫⎛⎫+++-+-++- ⎪ ⎪ ⎪⎢⎥++⎝⎭⎝⎭⎝⎭⎣⎦=11646n -+． 【提示】（Ⅰ）根据数列的递推关系，利用作差法即可求{}n a 的通项公式：（Ⅱ）求出11n n n b a a +=，利用裂项法即可求数列{}n b 的前n 项和．【考点】数列前n 项和与第n 项的关系，等差数列定义与通项公式． 18.【答案】（Ⅰ）答案见解析 【解析】（Ⅰ）连接BD ，设,BDAC G =连接EG FG EF ，，，在菱形ABCD 中，不妨设1GB =，由∠ABC=120°，可得AG GC ==由BE ⊥平面ABCD ，AB BC =，可知AE EC =， 又∵AE EC ⊥，∴EG EG AC =⊥，在Rt EBG △中，可得BE，故DF =在Rt FDG △中，可得FG =在直角梯形BDEF 中，由2BD =，BE，2DF =，可得2EF =， ∴222EG FG EF +=， ∴EG FG ⊥， ∵ACFG G =，∴EG ⊥平面AFC ， ∵EG ⊂平面AEC ， ∴平面AFC ⊥平面AEC ．（Ⅱ）如图，以G 为坐标原点，分别以,GB GC 的方向为x 轴，y 轴正方向，||GB 为单位长度，建立空间直角坐标系G xyz -，由（Ⅰ）可得0,A （，(E，2F ⎛- ⎝⎭，C ，∴AE =，1,CF ⎛=- ⎝⎭．故cos ,3||||AE CFAE CF AE CF <>==-，所以直线AE 与CF ．【提示】（Ⅰ）连接BD ，设BD AC G =，连接EG EF FG ，，，运用线面垂直的判定定理得到EG ⊥平面AFC ，再由面面垂直的判定定理，即可得到.（Ⅱ）以G 为坐标原点，分别以GB GC ，为x 轴，y 轴，GB 为单位长度，建立空间直角坐标系G xyz -，求得AE F C ，，，的坐标，运用向量的数量积的定义，计算即可得到所求角的余弦值．【考点】空间垂直判定与性质，异面直线所成角的计算．19.【答案】（Ⅰ）答案见解析 （Ⅱ）答案见解析 （Ⅲ）(i )66.32 (ii )46.24【解析】（Ⅰ）由散点图可以判断，y c =+y 关于年宣传费用x 的回归方程类型．(Ⅱ)令w =先建立y 关于w 的线性回归方程，由于81821()()108.8=68,16()iii ii w w yy d w w ==--==-∑∑ ∴56368 6.8100.6.==c y d w -⨯=-∴y 关于w 的线性回归方程为=100.6+68y w ，y ∴关于x 的回归方程为y （Ⅲ）（i ）由（Ⅱ）知，当49x =时，年销量y的预报值576.6y =， 年利润z 的预报值=576.60.249=66.32z ⨯-（ii ）根据（Ⅱ）的结果知，年利润z 的预报值20.12z x =x +--，∴13.66.8,2=即46.24x =，z 取得最大值，故宣传费用为46.24千元时，年利润的预保值最大．【提示】（Ⅰ）根据散点图，即可判断出．（Ⅱ）先建立中间量w =y 关于w 的线性回归方程，根据公式求出w ，问题得以解决．（Ⅲ）（Ⅰ）年宣传费49x =时，代入到回归方程，计算即可． （ii ）求出预报值得方程，根据函数的性质，即可求出．【考点】线性回归方程求法，利用回归方程进行预报预测． 20.【答案】0y a --=0y a ++=（Ⅱ）答案见解析【解析】（Ⅰ）由题设可得)Ma ，()N a -，或()M a-，)N a ．∵12yx '=，故24x y =在x =C在)a 处的切线方程为y a x -=-0y a --=，故24x y =在x =-处的导数值为，C 在()a -处的切线方程为y a x -=+，0y a ++=0y a --=0y a ++=． （Ⅱ）存在符合题意的点，证明如下：设(0,)P b 为符合题意得点，11(,)M x y ，22(,)N x y ，直线PM PN ，的斜率分别为12k k ，．将y kx a =+代入C 得方程整理得2440x kx a --=．∴12124,4x x k x x a +==-．∴1212121212122()()()=y b y b kx x a b x x k a b k k x x x x a--+-+++=+． 当b a =-时，有12k k + =0，则直线PM 的倾斜角与直线PN 的倾斜角互补，故OPM OPN ∠=∠，所以(0,)P a -符合题意．【提示】（Ⅰ）求出C在)a 处的切线方程，故24x y =在x =-即可求出方程．（Ⅱ）存在符合条件的点(0,)P b ，11(,)M x y，22(,)N x y ，直线PM PN ，的斜率分别为12k k ，直线方程与抛物线方程联立化为2440x kx a --=，利用根与系数的关系，斜率计算公式可得12()=k a b k k a++=即可证明． 【考点】抛物线的切线，直线与抛物线位置关系． 21.【答案】（Ⅰ）34a =- （Ⅱ）答案见解析【解析】（Ⅰ）设曲线()y f x =与x 轴相切于点0(,0)x ，则0()0f x =，0()0f x '=，即3002010430x ax x a ⎧++=⎪⎨⎪+=⎩，解得013,24x a ==-，因此，当34a =-时，x 轴是曲线()y f x =的切线． （Ⅱ）当(1,)x ∈+∞时，()ln 0g x x =-<，从而()min{(),()}()0h x f x g x g x =≤<， ∴()h x 在(1,)+∞无零点． 当1x =时，若54a ≥-，则5(1)04f a =+≥，(1)min{(1),(1)}(1)0h f g g ===，故1x =是()h x 的零点；若54a <-，则5(1)04f a =+<，(1)min{(1),(1)}(1)0h f g f ==<，故x =1不是()h x 的零点．当(0,1)x ∈时，()ln 0g x x =->，所以只需考虑()f x 在(0,1)的零点个数．(ⅰ)若3a ≤-或0a ≥，则2()3f x x a '=+在(0,1)无零点，故()f x 在(0,1)单调，而1(0)4f =，5(1)4f a =+，所以当3a ≤-时，()f x 在(0,1)有一个零点；当a ≥0时，()f x 在(0,1)无零点．(ⅱ)若30a -<<，则()f x在⎛ ⎝单调递减，在⎫⎪⎪⎭单调递增，故当x =()f x取的最小值，最小值为14f =．①若0f >，即304x -<<，()f x 在(0,1)无零点．②若0f =，即34a =-，则()f x 在(0,1)有唯一零点；③若0f <，即334a -<<-，由于1(0)4f =，5(1)4f a =+，所以当5344a -<<-时， ()f x 在(0,1)有两个零点；当534a -<≤-时，()f x 在(0,1)有一个零点．综上，当34a >-或54a <-时，()h x 有一个零点；当34a =-或54a =-时，()h x 有两个零点；当5344a -<<-时，()h x 有三个零点．【提示】（Ⅰ）设曲线()y f x =与x 轴相切于点0(,0)x ，则0()0f x =，0()0f x '=解出即可． （Ⅱ）对x 分类讨论：当(1,)x ∈+∞时，()ln 0g x x =-<，可得函数(1)min{(1),(1)}(1)0h f g g ===，即可得出零点的个数．当1x =时，对a 分类讨论利用导数研究其单调性极值即可得出．【考点】利用导数研究曲线的切线，分段函数的零点． 22.【答案】（Ⅰ）答案见解析 （Ⅱ）60ACB ∠=【解析】（Ⅰ）连接AE ，由已知得，AE BC AC AB ⊥⊥，，在Rt AEC △中，由已知得DE DC =，∴DEC DCE ∠=∠，连接OE ，OBE OEB ∠=∠， ∵90ACB ABC ∠+∠=， ∴90DEC OEB ∠+∠=，∴90OED ∠=，∴DE 是圆O 的切线．（Ⅱ）设1CE AE x ==，，由已知得AB =，BE =，由射影定理可得，2AE CE BE =，∴2x =x = ∴60ACB ∠=．【提示】（Ⅰ）连接AE 和OE ，由三角形和圆的知识易得90OED ∠=，可得DE 是O 的切线．（Ⅱ）设1CE AE x ==，，由射影定理可得关于x的方程2x =，解方程可得x 值，可得所求角度．【考点】圆的切线判定与性质，圆周角定理，直角三角形射影定理． 23.【答案】(Ⅰ)22cos 4sin 40ρρθρθ--+= (Ⅱ)12【解析】（Ⅰ）因为cos ,sin x y ρθρθ==， ∴1C 的极坐标方程为cos 2ρθ=-，2C 的极坐标方程为22cos 4sin 40ρρθρθ--+=．（Ⅱ）将=4θπ代入22cos 4sin 40ρρθρθ--+=，得240ρ-+=，解得1ρ=2ρ12=MN ρρ-，因为2C 的半径为1，则2C MN △的面积111sin 45=22⨯．【提示】（Ⅰ）由条件根据cos sin x y ρθρθ==，求得12C C ，的极坐标方程．（Ⅱ）把直线3C 的极坐标方程代入22cos 4sin 40ρρθρθ--+=，求得12ρρ，的值，从而求出2C MN △的面积．【考点】直角坐标方程与极坐标互化，直线与圆的位置关系．24.【答案】（Ⅰ）22.3x x ⎧⎫<<⎨⎬⎩⎭（Ⅱ）(2)+∞，【解析】（Ⅰ）当1a =时，不等式()1f x >化为1211x x +-->，等价于11221x x x ≤⎧⎨--+->⎩或111221x x x -<<⎧⎨++->⎩或11221x x x ≥⎧⎨+-+>⎩，解得223x <<，∴不等式()1f x >的解集为22.3x x ⎧⎫<<⎨⎬⎩⎭（Ⅱ）由题设可得，12,1()312,112,x a x f x x a x a x a x a --<-⎧⎪=+--≤≤⎨⎪-++>⎩，所以函数()f x 的图像与x 轴围成的三角形的三个顶点分别为21,03a A -⎛⎫⎪⎝⎭，(21,0)B a +，(,+1)C a a ，所以ABC △的面积为22(1)3a +， 由题设得22(1)63a +>，解得2a >，所以a 的取值范围为(2)+∞，． 【提示】（Ⅰ）当1a =时，把原不等式去掉绝对值，转化为与之等价的三个不等式组，分别求得每个不等式组的解集，再取并集，即得所求．（Ⅱ）化简函数()f x 的解析式，求得它的图像与x 轴围成的三角形的三个顶点的坐标，从而求得()f x 的图像与x 轴围成的三角形面积；再根据()f x 的图像与x 轴围成的三角形面积大于6，从而求得a 的取值范围．【考点】含绝对值不等式解法，分段函数，一元二次不等式解法．。