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正弦交流电的三要素分别是（）、（）和（）。

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我国的电网频率是（）HZ.

通常胶体金质控线上为哪种物质？

A. 羊抗鼠抗体
B. 胶体金分子颗粒
C. 待检测毒物标准品
D. 选我必错

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

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