长篇阅读Passage2IsCollegeaWorthyInvestment?A)Whyarewespendingsomuchmoneyoncollege?Andwhyarewesounhappyaboutit?Weallseemtoagreethatacollegeeducationiswonderful,andyetstrangelyweworrywhenweseefamiliesinvestingsomuchinthissupposedlyessentialgood.Maybeit’stimetoaskaquestionthatseemsalmostsacrilegious(大不敬的):isallthisinvestmentincollegeeducationreallyworthit?B)Theanswer,Ifear,isno.Foranincreasingnumberofkids,theextratimeandmoneyspentpursuingacollegediplomawillleavethemworseoffthantheywerebeforetheysetfootoncampus.C)Formyentireadultlife,agoodeducationhasbeenthemostimportantthingformiddle-classhouseholds.Myparentsspentmoreeducatingmysisterandmethantheyspentontheirhouse,andthey’renottheonlyones...and,ofcourse,foranincreasingnumberoffamilies,mostofthecostoftheirhouseisactuallythecostoflivinginagoodschooldistrict.Questioningthevalueofacollegeeducationseemsabitlikequestioningthevalueofhappiness,orfun.D)Theaveragepriceofallgoodsandserviceshasrisenabout50percent.Butthepriceofacollegeeducationhasnearlydoubledinthattime.Istheeducationthattoday’sstudentsaregettingtwiceasgood?Arenewworkerstwiceassmart?Havetheybecomesomehowmassivelymoreexpensivetoeducate?E)Perhapsabit.RichardVedder,anOhioUniversityeconomicsprofessor,says,“Ilookatthedata,andIseecollegecostsrisingfasterthaninflationuptothemid-1980sby1percentayear.NowIseethemrising3to4percentayearoverinflation.Whathashappened?Thefederalgovernmenthasstarteddroppingmoneyoutofairplanes.”Aidhasincreased,subsidized(补贴的)loanshavebecomeavailable,and“theuniversitieshavegottenthemoney.”EconomistBryanCaplan,whoiswritingabookabouteducation,agrees:“It’sagiantwasteofresourcesthatwillcontinueaslongasthesubsidiescontinue.”F)Promotionalliteratureforcollegesandstudentloansoftenspeaksofdebtasan“investmentinyourself.”Butaninvestmentissupposedtogenerateincometopayofftheloans.Morethanhalfofallrecentgraduatesareunemployedorinjobsthatdonotrequireadegree,andtheamountofstudent-loandebtcarriedbyhouseholdshasincreasedmorethanfivetimessince1999.Thesegraduatesweretoldthatadiplomawasalltheyneededtosucceed,butitwon’tevengetthemoutofthesparebedroomatMomandDad’s.Formany,themostvisibleresultoftheirfouryearsistheloanpayments,whichnowaveragehundredsofdollarsamonthonloanbalancesinthetensofthousands.G)It’strueaboutthemoney—sortof.Collegegraduatesnowmake80percentmorethanpeoplewhohaveonlyahigh-schooldiploma,andthoughtherearenopreciseestimates,thewagepremium(高出的部分)foranoutstandingschoolseemstobeevenhigher.Butthat’snottrueofeverystudent.It’sveryeasytospendfouryearsmajoringinEnglishliteratureandcomeoutnomoreemployablethanyouwerebeforeyouwentin.Conversely,chemicalengineersstraightoutofschoolcaneasilymakealmostfourtimesthewagesofanentry-levelhigh-schoolgraduate.H)JamesHeckman,theNobelPrize-winningeconomist,hasexaminedhowthereturnsoneducationbreakdownforindividualswithdifferentbackgroundsandlevelsofability.“Evenwiththesehighprices,you’restillfindingahighreturnforindividualswhoarebrightandmotivated,”hesays.Ontheotherhand,“ifyou’renotcollegeready,thentheanswerisno,it’snotworthit.”Expertstendtoagreethatfortheaveragestudent,collegeisstillworthittoday,buttheyalsoagreethattherapidincreaseinpriceiseatingupmoreandmoreofthepotentialreturn.Forborderlinestudents,tuition(学费)risecanpushthosereturnsintonegativeterritory.I)Everyoneseemstoagreethatthegovernment,andparents,shouldberethinkinghowweinvestinhighereducation—andthatemployersneedtorethinktheincreasinguseofcollegedegreesascrudescreeningtoolsforjobsthatdon’treallyrequirecollegeskills.“Employersseeingasurplusofcollegegraduatesandlookingtofilljobsarejustaddingthatrequirement,”saysVedder.“Infact,acollegedegreebecomesajobrequirementforbecomingabar-tender.”J)Wehavestartedtoseesomechangeonthefinanceside.Alawpassedin2007allowsmanystudentstocaptheirloanpaymentat10percentoftheirincomeandforgivesanybalanceafter25years.Butofcourse,thatdoesn’tcontrolthecostofeducation;itjustshiftsittotaxpayers.Italsoencouragesgraduatestochooselower-payingcareers,whichreducesthefinancialreturntoeducationstillfurther.“You’resubsidizingpeopletobecomepriestsandpoetsandsoforth,”saysHeckman.“Youmaythinkthat’sagoodthing,oryoumaynot.”Eitherwayitwillbeexpensiveforthegovernment.K)Whatmightbealotcheaperisputtingmorekidstowork.Caplannotesthatworkalsobuildsvaluableskills—probablymorevaluableforkidswhodon’tnaturallylovesittinginaclassroom.Heckmanagreeswholeheartedly:“Peoplearedifferent,andthoseabilitiescanbeshaped.That’swhatwe’velearned,andpublicpolicyshouldrecognizethat.”L)Heckmanwouldliketoseemoreapprenticeship-style(学徒式)programs,wherekidscanlearnintheworkplace—learnnotjustspecificjobskills,butthekindof“softskills,”likegettingtoworkontimeandgettingalongwithateam,thatarecrucialforcareersuccess.“It’sabouthavingmentors(指导者)andhavingworkplace-basededucation,”hesays.“TimeandagainI’veseenexamplesofthiskindofprogramworking.”M)Ah,buthowdowegettherefromhere?Withbetterpublicpolicy,hopefully,butalsobymakingbetterindividualdecisions.“Historicallymarketshavebeenabletohandlethesethings,”saysVedder,“andIthinkeventuallymarketswillhandlethisone.Ifitdoesn’timprovesoon,peoplearegoingtowakeupandask,‘WhyamIgoingtocollege?’”1.Caplansuggeststhatkidswhodon’tloveschoolgotowork.2.Anincreasingnumberoffamiliesspendmoremoneyonhousesinagoodschooldistrict.3.Subsidizedloanstocollegestudentsareahugewasteofmoney,accordingtooneeconomist.4.Moreandmorekidsfindtheyfareworsewithacollegediploma.5.Forthosewhoarenotpreparedforhighereducation,goingtocollegeisnotworthit.6.Overtheyearsthecostofacollegeeducationhasincreasedalmostby100%.7.Alawpassedrecentlyallowsmanystudentstopaynomorethanonetenthoftheirincomefortheircollegeloans.8.Middle-classAmericanshavehighlyvaluedagoodeducation.9.Morekidsshouldbeencouragedtoparticipateinprogramswheretheycanlearnnotonlyjobskillsbutalsosocialskills.10.Overfiftypercentofrecentcollegegraduatesremainunemployedorunabletofindasuitablejob.
长篇阅读Passage2IsCollegeaWorthyInvestment?A)Whyarewespendingsomuchmoneyoncollege?Andwhyarewesounhappyaboutit?Weallseemtoagreethatacollegeeducationiswonderful,andyetstrangelyweworrywhenweseefamiliesinvestingsomuchinthissupposedlyessentialgood.Maybeit’stimetoaskaquestionthatseemsalmostsacrilegious(大不敬的):isallthisinvestmentincollegeeducationreallyworthit?B)Theanswer,Ifear,isno.Foranincreasingnumberofkids,theextratimeandmoneyspentpursuingacollegediplomawillleavethemworseoffthantheywerebeforetheysetfootoncampus.C)Formyentireadultlife,agoodeducationhasbeenthemostimportantthingformiddle-classhouseholds.Myparentsspentmoreeducatingmysisterandmethantheyspentontheirhouse,andthey’renottheonlyones...and,ofcourse,foranincreasingnumberoffamilies,mostofthecostoftheirhouseisactuallythecostoflivinginagoodschooldistrict.Questioningthevalueofacollegeeducationseemsabitlikequestioningthevalueofhappiness,orfun.D)Theaveragepriceofallgoodsandserviceshasrisenabout50percent.Butthepriceofacollegeeducationhasnearlydoubledinthattime.Istheeducationthattoday’sstudentsaregettingtwiceasgood?Arenewworkerstwiceassmart?Havetheybecomesomehowmassivelymoreexpensivetoeducate?E)Perhapsabit.RichardVedder,anOhioUniversityeconomicsprofessor,says,“Ilookatthedata,andIseecollegecostsrisingfasterthaninflationuptothemid-1980sby1percentayear.NowIseethemrising3to4percentayearoverinflation.Whathashappened?Thefederalgovernmenthasstarteddroppingmoneyoutofairplanes.”Aidhasincreased,subsidized(补贴的)loanshavebecomeavailable,and“theuniversitieshavegottenthemoney.”EconomistBryanCaplan,whoiswritingabookabouteducation,agrees:“It’sagiantwasteofresourcesthatwillcontinueaslongasthesubsidiescontinue.”F)Promotionalliteratureforcollegesandstudentloansoftenspeaksofdebtasan“investmentinyourself.”Butaninvestmentissupposedtogenerateincometopayofftheloans.Morethanhalfofallrecentgraduatesareunemployedorinjobsthatdonotrequireadegree,andtheamountofstudent-loandebtcarriedbyhouseholdshasincreasedmorethanfivetimessince1999.Thesegraduatesweretoldthatadiplomawasalltheyneededtosucceed,butitwon’tevengetthemoutofthesparebedroomatMomandDad’s.Formany,themostvisibleresultoftheirfouryearsistheloanpayments,whichnowaveragehundredsofdollarsamonthonloanbalancesinthetensofthousands.G)It’strueaboutthemoney—sortof.Collegegraduatesnowmake80percentmorethanpeoplewhohaveonlyahigh-schooldiploma,andthoughtherearenopreciseestimates,thewagepremium(高出的部分)foranoutstandingschoolseemstobeevenhigher.Butthat’snottrueofeverystudent.It’sveryeasytospendfouryearsmajoringinEnglishliteratureandcomeoutnomoreemployablethanyouwerebeforeyouwentin.Conversely,chemicalengineersstraightoutofschoolcaneasilymakealmostfourtimesthewagesofanentry-levelhigh-schoolgraduate.H)JamesHeckman,theNobelPrize-winningeconomist,hasexaminedhowthereturnsoneducationbreakdownforindividualswithdifferentbackgroundsandlevelsofability.“Evenwiththesehighprices,you’restillfindingahighreturnforindividualswhoarebrightandmotivated,”hesays.Ontheotherhand,“ifyou’renotcollegeready,thentheanswerisno,it’snotworthit.”Expertstendtoagreethatfortheaveragestudent,collegeisstillworthittoday,buttheyalsoagreethattherapidincreaseinpriceiseatingupmoreandmoreofthepotentialreturn.Forborderlinestudents,tuition(学费)risecanpushthosereturnsintonegativeterritory.I)Everyoneseemstoagreethatthegovernment,andparents,shouldberethinkinghowweinvestinhighereducation—andthatemployersneedtorethinktheincreasinguseofcollegedegreesascrudescreeningtoolsforjobsthatdon’treallyrequirecollegeskills.“Employersseeingasurplusofcollegegraduatesandlookingtofilljobsarejustaddingthatrequirement,”saysVedder.“Infact,acollegedegreebecomesajobrequirementforbecomingabar-tender.”J)Wehavestartedtoseesomechangeonthefinanceside.Alawpassedin2007allowsmanystudentstocaptheirloanpaymentat10percentoftheirincomeandforgivesanybalanceafter25years.Butofcourse,thatdoesn’tcontrolthecostofeducation;itjustshiftsittotaxpayers.Italsoencouragesgraduatestochooselower-payingcareers,whichreducesthefinancialreturntoeducationstillfurther.“You’resubsidizingpeopletobecomepriestsandpoetsandsoforth,”saysHeckman.“Youmaythinkthat’sagoodthing,oryoumaynot.”Eitherwayitwillbeexpensiveforthegovernment.K)Whatmightbealotcheaperisputtingmorekidstowork.Caplannotesthatworkalsobuildsvaluableskills—probablymorevaluableforkidswhodon’tnaturallylovesittinginaclassroom.Heckmanagreeswholeheartedly:“Peoplearedifferent,andthoseabilitiescanbeshaped.That’swhatwe’velearned,andpublicpolicyshouldrecognizethat.”L)Heckmanwouldliketoseemoreapprenticeship-style(学徒式)programs,wherekidscanlearnintheworkplace—learnnotjustspecificjobskills,butthekindof“softskills,”likegettingtoworkontimeandgettingalongwithateam,thatarecrucialforcareersuccess.“It’sabouthavingmentors(指导者)andhavingworkplace-basededucation,”hesays.“TimeandagainI’veseenexamplesofthiskindofprogramworking.”M)Ah,buthowdowegettherefromhere?Withbetterpublicpolicy,hopefully,butalsobymakingbetterindividualdecisions.“Historicallymarketshavebeenabletohandlethesethings,”saysVedder,“andIthinkeventuallymarketswillhandlethisone.Ifitdoesn’timprovesoon,peoplearegoingtowakeupandask,‘WhyamIgoingtocollege?’”1.Caplansuggeststhatkidswhodon’tloveschoolgotowork.2.Anincreasingnumberoffamiliesspendmoremoneyonhousesinagoodschooldistrict.3.Subsidizedloanstocollegestudentsareahugewasteofmoney,accordingtooneeconomist.4.Moreandmorekidsfindtheyfareworsewithacollegediploma.5.Forthosewhoarenotpreparedforhighereducation,goingtocollegeisnotworthit.6.Overtheyearsthecostofacollegeeducationhasincreasedalmostby100%.7.Alawpassedrecentlyallowsmanystudentstopaynomorethanonetenthoftheirincomefortheircollegeloans.8.Middle-classAmericanshavehighlyvaluedagoodeducation.9.Morekidsshouldbeencouragedtoparticipateinprogramswheretheycanlearnnotonlyjobskillsbutalsosocialskills.10.Overfiftypercentofrecentcollegegraduatesremainunemployedorunabletofindasuitablejob.
如果ξ与η不相关，则（）。 A: D（ξ+η）=Dξ+Dη B: D（ξ-η）=Dξ-Dη C: D（ξη）=Dξ·Dη D: E（ξη）=Dξ·Dη
如果ξ与η不相关，则（）。 A: D（ξ+η）=Dξ+Dη B: D（ξ-η）=Dξ-Dη C: D（ξη）=Dξ·Dη D: E（ξη）=Dξ·Dη
已有定义intd=-2;，执行以下语句后的输出结果是：printf('*d(1)=%d*d(2)=%3d*d(3)=%-3d* ',d,d,d,d);printf('*d(4)=%o*d(5)=%7o*d(6)=%-7o* ',d,d,d,d);printf('*d(4)=%x*d(5)=%6x*d(6)=%-6x* ',d,d,d,d);
已有定义intd=-2;，执行以下语句后的输出结果是：printf('*d(1)=%d*d(2)=%3d*d(3)=%-3d* ',d,d,d,d);printf('*d(4)=%o*d(5)=%7o*d(6)=%-7o* ',d,d,d,d);printf('*d(4)=%x*d(5)=%6x*d(6)=%-6x* ',d,d,d,d);
圆柱螺旋弹簧的旋绕比C是（） A: d/D B: d/D C: D/d D: D/d
圆柱螺旋弹簧的旋绕比C是（） A: d/D B: d/D C: D/d D: D/d
已有定义int d= –2；执行以下语句后的输出结果是。 printf(" * d(1) =%d * d(2)= %3d * d(3) =% –3d * "，d，d，d)； printf(" * d(4) =%d * d(5)= %7d * d(6) =% –7d * "，d，d，d)；
已有定义int d= –2；执行以下语句后的输出结果是。 printf(" * d(1) =%d * d(2)= %3d * d(3) =% –3d * "，d，d，d)； printf(" * d(4) =%d * d(5)= %7d * d(6) =% –7d * "，d，d，d)；
若有说明语句：int a，b，c，* d＝＆c；，则能正确从键盘读入三个整数分别赋给变量a、b、d的语句是 ( ) A．scanf("%d%d%d"，＆a，＆b，d)； B．scanf("%d%d%d"，＆a，＆b，＆d)； C．scanf("%d %d%d"，a，b，d)； D．scanf("%d%d%d"，a，b，* d)；
若有说明语句：int a，b，c，* d＝＆c；，则能正确从键盘读入三个整数分别赋给变量a、b、d的语句是 ( ) A．scanf("%d%d%d"，＆a，＆b，d)； B．scanf("%d%d%d"，＆a，＆b，＆d)； C．scanf("%d %d%d"，a，b，d)； D．scanf("%d%d%d"，a，b，* d)；
如果要用JK触发器来实现D触发器的功能，则J=( )，K=( )。 A: D;D' B: D;D C: D';D' D: D;D
如果要用JK触发器来实现D触发器的功能，则J=( )，K=( )。 A: D;D' B: D;D C: D';D' D: D;D
20A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、120、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、130、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、140、A、B、C、D、A
20A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、120、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、130、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、140、A、B、C、D、A
下列字符之间的大小关系 A: 0>;D>;d B: d>;D>;0 C: D>;0>;d D: d>;0>;D
下列字符之间的大小关系 A: 0>;D>;d B: d>;D>;0 C: D>;0>;d D: d>;0>;D
互换行列式 $D$ 的两行（列）得到行列式 $D'$，则有（ ）. A: $D'=D$ B: $D'=2D$ C: $D'=-D$ D: $D'=0$
互换行列式 $D$ 的两行（列）得到行列式 $D'$，则有（ ）. A: $D'=D$ B: $D'=2D$ C: $D'=-D$ D: $D'=0$