九年级英语七选五专练2(10篇带答案)

九年级英语七选五专练2（10篇）11Endangereddolphinsarebeautifulanimalsthatneedtobesaved.However,ifwecontinuedtofollowthesamepaththatweareonrelatedtotheenvironment,manyofthewonderfulcreaturesaregoingtocontinuetogoextinct.(106)_________Manyofthemareriverdolphinsandtheyareveryclosetobeinglostforeverifwedototakethetimetocareforthem.Thefollowingisthereasonswhytheyareindanger.(107)_________Dolphinscanoftengetstuckinthesenetsandtheymaydie.Anotherproblemisthefactthatmanypeopleanddifferentcountrieswillhuntfordolphinsasasourceoffood.(108)_________Whentheoceansandriversarepolluted,itaffectstheenvironmentwherethesebeautifulcreaturesareliving.Itmaybeimportanttoalsokeepinmindthatthedolphinistowardsthetopofthefoodchain.(109)_________Ifthesesmalleranimalsareaffectedbythepollutionaswell,therereallyisnosafeplaceforthedolphintogo.(110)_________Youcanalsopayattentiontothelandaroundyou.Donotlitterandstopifyoudo.Spendtimeontheweekendcleaninguptrashinyourareaandrecyclewhatyoucan.Youplayalargeroleinthiswhetheryoubelieveitornot.Sofindoutwhatyourroleisrelatedtoendangereddolphinsandworktowardsapositivechange.A.We,ashumans,havetobedoingsomethingtoprotectthem.B.Itmayinterestyoutoknowthatthereareaboutsixdifferenttypesofdolphinsthatareendangered.C.Oneproblemthathascausedendangereddolphinsisfishingnets.D.Becauseofthis,theyaregoingtoeatsmalleranimalsthatareinthewater.E.Thepollutionisbecomingworseandworse.F.Thenextproblemispollution.G.Endangereddolphinsareveryimportantforus.12Sooncomputersandothermachineswillbeabletorememberyoubylookingatyoureyes!Theprogramworksbecauseeveryone’seyesaredifferent.Sointhefutureyouwon’thavetorememberanumberwhenyouwanttouseamachineortakemoneyoutofabank.106.Theeye-recognition(眼睛识别)programhasalreadybeentestedinshopsandbanksintheUSA,Britain,Spain,ItalyandTurkey.107.Eye-recognitionisacourseofrecognizingiris(虹膜),whichincludesthefollowingsteps.First,akindofmachineneedstocollectdifferentexamplesofone’sirisfromhiseyesandstorethem.Second,whenthispersongoestothebanktotakeoutofmoney,thismachinewillhaveirisfeatureextraction(采集).108.Oncetheexamplesandthefeatureextractionarethesame,thispersonwillbeidentified,andhewilltakeoutofthemoneyfromthebanksuccessfully.109.Machineswillsoonbeabletoknowyoufromtheshapeofyourfaceorhandorevenyoursmell!Wealreadyhavemachinesthatcantellwhoyouarefromyourvoiceorthemarkmadebyyourfinger.Eye-recognitionisbetterthanotherkindsbecauseyoureyesdon’tchangeasyougetolder,anddon’tgetdirtylikehandsorfingers,andeventwinshavedifferenteyes.110._____________________________However,someotherprogramsmayonlybe51%correctnow.InBritain,itwasfoundthat91%ofpeoplewhohadtrieditsaidthattheylikedtheideaofeye-recognition.A.However,scientistsarealsoworkingonothersystems.B.You’lljusthavetolookatthemachineanditwillbeabletotellwhoyouare.C.PutyourhandsontheATManditcangettheinformationofwhoyouare.D.Then,thismachinewillcomparetheexampleskeptinitwithirisfeatureextraction.E.Thismachinecanalsobeusedineducationsystem.F.Sotheeyerecognitionprogramcanbeupto94%correct,dependingonhowgoodthetechnology(科技)is.G.Soonthistechnologywilltaketheplaceof(取代)allotherwaysoffindingoutwhopeopleare.13Everyyear,moreandmorestudentsbecomevolunteers.Theprojectsmaybewiththeirschool,neighborhood,ortown,buttheworkofallvolunteersisimportant._____106_____First,volunteeringhelpsothers.Volunteersarepartofthesolutiontotheproblems!Whileitiseasytocomplainaboutthingsthatarenotright,thevolunteertakesactionratherthancomplaining.Whenastudentspendstimeworkingataretirement(退休)home,cleaningupapark,orteachingayoungerstudent,thevolunteermakestheworldabetterplace.Second,beingavolunteermakesstudentsfeelgoodaboutthemselves.Whenastudentvolunteerknowsthathisorhereffortshavemadesomeoneelse'slifebetter,thevolunteerfeelsgreat.____108____Volunteersmakeithappen.Althoughsomevolunteerworkislongortiring,studentvolunteersendthedayknowingtheydidtherightthing.Theirparents,teachers,andthepublicareproudofthem.Knowingtheydidtherightthingmakesthemfeelbetter,eveniftheyaretired.Finally,studentslearnthatvolunteeringisfun.____109____Itisfuntobewiththeirfriends,toenjoytheweather,andtopicniclaterinabeautiful,cleanarea.Otherstudentsmightreadtoyoungchildreninaplaygroup.Itisfuntospendtimewithchildrenandtohavethemsmileandlaugh.____110____Theworkofstudentvolunteersisapowerfulforcethatmakestheworldabetterplace.A.Studentsalwayshearpeoplesayingthateveryoneshouldcareaboutotherpeople.B.Nomatterwhattheiragesortalentsare,everystudentcanbeavolunteer.C.InChina,manystudentswantstobevolunteers.D.Agroupofstudentsmightvolunteertocleanupariverbedinearlyspring.E.Studentsfindthattherearemanyadvantagestovolunteering.F.Manypeoplecomplainaboutproblemsinoursociety.G.Studentsplayanimportantpartinvolunteering14Theworldisaninterestingplace.Differentpeoplelikedifferentthings.Somepeoplelikeloudmusic.Otherpeopledon't.106_________Manypeoplelikesports,buttheydonotalllikethesamesports.Insomecountries,cricket（板球运动）isaverypopularsport,Inothersitisnotpopularatall.NooneplaysitorwatchesitonTV.However,mostpeoplelikesoccer.TheWorldCupisverypopular.107_________