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.
比较C≡C, C=C, C─C, C=C─C=C的键长次序为: C=C─C=C>C─C> C≡C >C=C|C=C─C=C>C─C>C=C>C≡C|C≡C>C=C>C─C>C=C─C=C|C─C>C=C>C=C─C=C>C≡C|C─C>C=C─C=C>C=C>C≡C
比较C≡C, C=C, C─C, C=C─C=C的键长次序为: C=C─C=C>C─C> C≡C >C=C|C=C─C=C>C─C>C=C>C≡C|C≡C>C=C>C─C>C=C─C=C|C─C>C=C>C=C─C=C>C≡C|C─C>C=C─C=C>C=C>C≡C
下列哪种主链骨架原子排列最能代表两个肽键?() A: Cα—N—Cα—C—Cα—N—Cα—C B: Cα—N—C—C—N—Cα C: C—N—Cα—Cα—C—N D: Cα—C—N—Cα—C—N E: Cα—Cα—C—N—Cα—Cα—C
下列哪种主链骨架原子排列最能代表两个肽键?() A: Cα—N—Cα—C—Cα—N—Cα—C B: Cα—N—C—C—N—Cα C: C—N—Cα—Cα—C—N D: Cα—C—N—Cα—C—N E: Cα—Cα—C—N—Cα—Cα—C
比较C≡C(Ⅰ),C=C(Ⅱ),C─C(Ⅲ),C=C─C=C(Ⅳ)的键长次序为( )。 A: Ⅰ＞Ⅱ＞Ⅲ＞Ⅳ B: Ⅲ＞Ⅱ＞Ⅳ＞Ⅰ C: Ⅲ＞Ⅳ＞Ⅱ＞Ⅰ D: Ⅳ＞Ⅲ＞Ⅱ＞Ⅰ
比较C≡C(Ⅰ),C=C(Ⅱ),C─C(Ⅲ),C=C─C=C(Ⅳ)的键长次序为( )。 A: Ⅰ＞Ⅱ＞Ⅲ＞Ⅳ B: Ⅲ＞Ⅱ＞Ⅳ＞Ⅰ C: Ⅲ＞Ⅳ＞Ⅱ＞Ⅰ D: Ⅳ＞Ⅲ＞Ⅱ＞Ⅰ
不稳定的一类化合物是: C≡C|C－C|C＝C|C＝C－C＝C|C＝C＝C
不稳定的一类化合物是: C≡C|C－C|C＝C|C＝C－C＝C|C＝C＝C
NaNH4HPO4水溶液的质子条件式为 A: c(H+)+c(H2PO4-)+2 c(H3PO4)=c(OH-)+c(NH3) +c(PO43-) B: c(H+)+c(H2PO4-)+ c(H3PO4)=c(OH-)+c(NH3) +c(PO43-) C: c(H+)+c(NH3)+ c(H3PO4)=c(OH-)+c(PO43-) +c(H2PO4-) D: c(H+)+c(NH3)+ 2c(H3PO4)=c(OH-)+c(PO43-) +c(H2PO4-)
NaNH4HPO4水溶液的质子条件式为 A: c(H+)+c(H2PO4-)+2 c(H3PO4)=c(OH-)+c(NH3) +c(PO43-) B: c(H+)+c(H2PO4-)+ c(H3PO4)=c(OH-)+c(NH3) +c(PO43-) C: c(H+)+c(NH3)+ c(H3PO4)=c(OH-)+c(PO43-) +c(H2PO4-) D: c(H+)+c(NH3)+ 2c(H3PO4)=c(OH-)+c(PO43-) +c(H2PO4-)
比较C≡C(I)，C=C(II)，C─C(III)，C=C─C=C(IV)的键长次序为：
比较C≡C(I)，C=C(II)，C─C(III)，C=C─C=C(IV)的键长次序为：
在同一种固体介质中，纵波、横波、表面波三者之间的声速关系为（） A: C﹤C﹤C B: C﹤C﹤C C: C﹤C﹤C D: C﹤C﹤C
在同一种固体介质中，纵波、横波、表面波三者之间的声速关系为（） A: C﹤C﹤C B: C﹤C﹤C C: C﹤C﹤C D: C﹤C﹤C
scanf(“%c%c%c“, &a,&b,&c)与scanf(“%c %c %c“ ,&a,&b,&c)的输入（ ）。
scanf(“%c%c%c“, &a,&b,&c)与scanf(“%c %c %c“ ,&a,&b,&c)的输入（ ）。
能产生共轭效应的是 A: C=C=C B: C=C C: C≡C D: C=C-C=C E: C-C
能产生共轭效应的是 A: C=C=C B: C=C C: C≡C D: C=C-C=C E: C-C