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Please mark the following essay.Direction:Somepeoplethinkthattheycanlearnbetterbythemselvesthanwithateacher.Othersthinkthat itisalwaysbettertohaveateacher.Whichdoyouprefer?Usespecificreasonstodevelopyour essay. Itiscertainlysaidthatlearningisanongoingprocess.Everypersonlearnsomethingnew accordingtotheirage,experience,knowledgeandeducation.Accordingtomypointofviewitis alwaysbettertohaveteacherorguideforstudy.Oneteacherhasadequateknowledgetoteachtheirstudent.Heknowsallthepossiblewaysto makesubjecteasierforthestudents,moreover,heteachestheminaneffectivemanner.For example,somestudentsareweakinsomesubjectsbutateacheralwaysguidesthemaccordingto theirmentalcapacity.Heteachesthemasfun.Somepeoplecanlearnbetteringroupbydiscuss thetopicswithothers.Inclasspeoplecanknowtheviewsofothers,eventheyknowhowwecan learneffectively.Wheretheteacheralwaysgivesaneasydirectiontolearn. Inthetoday’scompetitiveworld,everybodyisbusy,somepeoplethinkthatrathertowastetheir timetogoforclassestheycanlearnbettertheirsubject_.TheycanattendonlineclassesbyusingtheInternetathome.TheycangetrelevantinformationfromtheInternetregardingtheirtopic. Thereisnotspecifictimeoragelimittolearnsomethingnew.Somenewthingswecanonlylearnfromexperience–forexamplenewfacts,newhabitsandsoon. Insumup,Iwouldliketosaythatitisalwaysbetterforthepeopletohaveateacherbecausea teacherhasgoodknowledge,experienceandiseducatedhowtoteachothers.Peoplewilllearn fromateacherinaneasierway

A. 7
B. 6.5
C. 5
D. 4

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Please mark the following essayDirections: Somesaythatrichcountriesshouldhelppoorcountrieswithtrade,healthandeducation.Doyouagreeordisagree?Givereasonsforyouranswerandincludeexamplesfromyourexperience. Improvementsinhealth,educationandtradeareessentialforthedevelopmentofpoorernations. Somesaythatthegovernmentsofrichernationsshouldtakemoreresponsibilityforhelpingthe poorernationsinsuchareas.Inmyopinion,theaidofwealthycountriesisimperativetofight povertyindevelopingnations. Today’sworldhasbeendividedintodevelopingandindustrialisedcountrieswhichthemain differencebetweenthemistheamountofmoneythatgovernmentsapplyinimportantsectorssuchaseducation,healthandcommerce.Mostofthepoorernationsareburiedindebtsasaresultof theirunbalancedfinanceswhicharereflectinafailedhealthcare,anunstructurededucation systemandaweakinternationaltrade.Thisviciouscyclewillcontinueindefinitelyunless wealthiernationsshowinterestinminimizingtheworldwideeconomicdifferences,aswellas takingmoreresponsibilityforassistinglessfortunatecountries. MostoftheAfricancountriesliveinsubhumanconditionsbecauseoftheextremepoverty, upheaval,hunger,disease,unemployment,lackofeducationandbothinexperiencedandcorrupt administrations.ThedevastatingconsequencesoftheAIDSepidemicinthosecountriescould improveiftheinfectedpopulationweretoreceivefreedrugstocontrolthedisease,haveaccesstohealthprofessionalsandgetinformationonhowtopreventitsspread.Butthiscanonlybeachievedthroughinternationalhelpprogramsinwhichleadersoftheworld’srichestcountriesdonate medicineandalsosenddoctorsandnursestotreatandeducatethoseinneed. Moreover,mostofthepoorcountriesrelyonsellingagriculturalproductsandrawmaterialsto richnationsandbuyingindustrializedproductsfromthemresultinginahugefinancialdeficit. Consequently,theyborrowasignificantamountofmoneyfromtheWorldBanktotrytoimprove theirbrokeneconomies,butsometimesthemoneydisappearswithnosignificantchangesandtheycannotevenpaytheinteresttothebank.Recognisingthisasanissuethatwealthycountriescan resolve,lastyeartheG8,whichiscomprisedofleadersoftheeightrichestnations,decidedto forgivebillionsofdollarsworthofdebtowedbytheworld’spoorestnations.Inaddition,they developedadequateloanprogramstofinanciallyassistthosecountries. Inconclusion,leadersoftheindustrialisedcountriesplayanindispensableroleinassisting developingnationsindealingwithessentialareassuchashealth,educationandtrade.Theiraidisthekeytobreakingtheviciouscyclepoorercountriesarelockedin,whichresultsinpovertyand death.

A. 8.5
B. 7.5
C. 6.5
D. 5.5

设对称式锥齿轮差速器壳所得到转矩为M0,左右两半轴的转矩分别为M1、M2,则有( )。

A. M1=M2=M0
B. M1=M2=2M0
C. M1+M2=1/2M0
D. M1+M2=M0

汽车直线行驶时,差速器中的行星齿轮( )。

A. 只有自转,没有公转
B. 只有公转,没有自转
C. 既有公转,又有自转
D. 既无公转,又无自转

汽车转弯行驶时,差速器中的行星齿轮( )。

A. 只有自转,没有公转
B. 只有公转,没有自转
C. 既有公转,又有自转
D. 既无公转,又无自转

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