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已知函数(x∈R), (Ⅰ)求函数f(x)的最小值; (Ⅱ)已知m∈R,命题p:关于x的不等式f(x)≥m2+2m-2对任意x∈R恒成立;命题q:函数y=(m2-1)x是增函数.若“p或q”为真...
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高二下学期数学《》真题及答案
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Mr.PeterJohnsonagedtwenty﹣threebattledforhalfanhourtoescapefromhistrappedcaryesterdaywhenitlandedupsidedowninthreefeetofwater.Mr.Johnsontooktheonlyescaperoute﹣﹣throughtheboot行李箱. Mr.Johnson'scarhadfinishedupinaditch沟渠atRomneyMarsinKentafterskiddingoniceandhittingabank.FortunatelythewaterbegantocomeinonlyslowlyMr.JohnsonsaidIcouldn'tforcethedoorsbecausetheywerejammedagainstthewallsoftheditchanddarednotopenthewindowsbecauseIknewwaterwouldcomefloodingin. Mr.JohnsonasweetsalesmanofSittingHomeKentfirsttriedtoattracttheattentionofothermotoristsbysoundingthehornandhammeringontheroofandboot.Thenhebeganhisstruggletoescape. LaterhesaidItwasreallyahalfpennythatsavedmylife.ItwastheonlycoinIhadinmypocketandIusedittounscrewthebackseattogetintotheboot.Ihammereddesperatelywithahammertryingtomakesomeonehearbutnohelpcame. Ittooktenminutestounscrewtheseatandafurtherfiveminutestoclearthesweetsamplesfromtheboot.ThenMr.Johnsonfoundawrenchandbegantoworkonthebootlock.Fifteenminutespassedby.ItwastheonlychanceIhad.FinallyitgavebutassoonasImovedthebootlidthewaterandmudpouredin.Iforcedtheliddownintothemudandscrambledclearasthecarfilledup. HishandsandarmscutandbruisedMr.JohnsongottoBeckettFarmnearbywherehewaslookedafterbythefarmer'swifeMrs.LucyBates.TremblinginablankethesaidThatthirtyminutesseemedlikehours.Onlythetipsofthecarwheelswerevisiblepolicesaidlastnight.Thevehiclehadsunkintotwofeetofmudatthebottomoftheditch. 1Inwhichsectionofanewspapercanwereadthisarticle? A.Bookreview B.Newsreport C.Campuslife D.Continuedstory 2TheunderlinedsentenceinParagraph5Finallyitgavemeansthat. A.luckilythedoorwastornawayintheend B.atlastthewrenchwentbroken C.thelockcameopenafterallhisefforts D.thechancewaslostatthelastminute 3Itcanbeinferredfromthepassagethat. A.theditchwasalongaquietcountryroad B.theaccidenthappenedonaclearwarmday C.thepolicehelpedMr.Johnsongetoutoftheditch D.Mr.Johnsonhadatenderwifeandwaswellattended
OurMuseumsGalleriesandZoo 19world﹣classmuseumsgalleriesandazoo TheSmithsonianofferselevenmuseumsandgalleriesontheNationalMallandsixothermuseumsandtheNationalZoointhegreaterNationalCapitalArea.InNewYorkCityweinviteyoutotourtwomuseumsinhistoricsettings. NotnearaSmithsonianmuseum?Lookforexhibitionsandmuseumsinyourcommunity.Herewehavelistedsomeplacestovisit Tips&Guidelines StopatanySmithsonianmuseuminformationdeskwherefriendlyandknowledgeablestaffandvolunteerscanassistyouinplanningyourvisit. ServiceanimalsarewelcomeatthemuseumsandtheNationalZoo.Petsarenotpermitted. Lunchesshouldbeproperlyclosedorstoredinlockersduringyourvisit. 1TheSmithsonianoffersalltheseEXCEPT. A.galleries B.concerts C.museums D.zoos 2Ifyouareinterestedinanimalsyoucan. A.goto1661PennsylvaniaAvenueNWWashingtonDC B.goto8thandFStreetsNWWashingtonDC C.visitthemuseum11a.m.onChristmas D.visitthezooatweekendsonJune25 3Toarrangeyourvisitbetteryoucan. A.havelunchduringyourvisit B.takeyourpetsalongwithyou C.askthestaffandvolunteersforhelp D.fillinanapplicationformbeforeyourvisit
TheMonkeesbupabout1970buthappilytheyreunitedinthemid﹣1980﹩.
WhilecheckingoutatthegrocerystoreInoticedawomanbehindme.Shewas1oneofshoppingcartswiththebasketinfront.Thebasket2justafewitemssomeapplesaloafofbreadsomecannedgoodsanda3ofcoral﹣coloredroses.I4toherthattheywereindeedverylovelyroses.ShesaidIreallydolovethemthey'remyfavorite5. WelljustasIwasleavingIheardhersaytothecashierYoucan6thebunchofrosesbackIreallycouldn't7them.Iturnedaroundandaskedherifshewould8metogetthemforher.She9herheadandsaidWhywouldyouwanttodothat?Youcertainlydon'thaveto.IrepliedthatIjustwantedto10sinceshelovedthemsomuch.Shestillseemed11.SoItoldher12shewouldallowmeto13themtohershewouldbedoingmeafavor.WithtearsinhereyesshesaidIreallydolovethem.Thanks.AsI14thecashierthemoneyfortherosesInoticedhewasalittle15aswell. OnthewayhomeIwasreminded16asongIhadhearddecadesagoandI'velovediteversince.Thesongis'BreadandRoses'.It'sabeautifulsongonmanylevelsandremindsusthatwe17needfoodbutweallalsoneed18. Alinefromthissongfitsthissituationperfectly.It19Heartsstarveaswellasbodies.Giveusbreadbutgiveus20too. 1A.driving B.holding C.dragging D.pushing 2A.held B.Put C.presented D.produced 3A.box B.bunch C.basket D.handful 4A.Showed B.commented C.introduced D.recommended 5A.smell B.shape C.color D.memory 6A.deal B.put C.pick D.come 7A.make B.collect C.manage D.afford 8A.allow B.advise C.want D.prefer 9A.nodded B.shook C.lowered D.raised 10A.partly B.especially C.specially D.merely 11A.puzzled B.shocked C.hesitant D.Regretful 12A.if B.but C.only D.just 13A.owe B.pass C.gift D.deliver 14A.charged B.awarded C.offered D.handed 15A.teary﹣eyed B.starry﹣eyed C.weary﹣eyed D.sharp﹣eyed 16A.of B.for C.to D.if 17A.notif B.notbut C.noteven D.notonly 18A.love B.share C.money D.beauty 19A.reads B.sings C.speaks D.shows 20A.goodness B.roses C.comfort D.medicine
LearningFastandDeep Overthepastfiveyearsresearchersinartificialintelligencehavebecometherockstarsofthetechnologyworld.AbranchofAIknownasdeeplearningwhichusesneural神经的networkstoscanthroughlargevolumesofdatalookingforpatternshasprovensousefulthatskilledpractitionerscancommandhighsix﹣figuresalariestobuildsoftwareforAmazonAppleFacebookandGoogle. ThestandardrouteintothesejobshasbeenaPhDincomputersciencefromoneofAmerica'stopuniversities.Earningonetakesyearsandrequiresapersonalitysuitedtoacademiawhichisrareamongmorenormalfolk. Thatischanging. Lastmonthfast.aianon﹣profiteducationorganizationbasedinSanFranciscokickedoffthethirdyearofitscourseindeeplearning.Sinceitsfoundationithasattractedmorethan100000studentsaroundtheglobefromIndiatoNigeria.ThecourseandotherslikeitcomewithasimpleideathereisnoneedtospendyearsobtainingaPhDinordertopractisedeeplearning.Creatingsoftwarethatlearnscanbetaughtasacraftnotasahighintellectualpursuittobeundertakenonlyinanivorytower.Fast.ai'scoursecanbecompletedinjustsevenweeks. TomakeitaccessibletoanyonewhowantstolearnhowtobuildAIsoftwareistheaimofJeremyHowardwhofoundedfast.aiwithRachelThomasamathematician.Hesaysschoolmathematicsissufficient.No.Greek.LettersMr.Howardintonespoundingthetablewithhisfistforpunctuation. SomeexpertsworrythatthiswillserveonlytocreateafloodofunreliableAIsystemswhichwillbeuselessatbestanddangerousatworst.IntheearliestdaysoftheInternetonlyaselectfewnerdsnamelycomputerholicswithspecificskillscouldbuildapplications.Notmanypeopleusedthem.ThentheinventionoftheWorldWideWebledtoanexplosionofwebpagesbothgoodandbad.ButitwasonlybyopeninguptoallthattheInternetgavebirthtoonlineshoppinginstantglobalcommunicationsandsearch.IfMr.HowardandothershavetheirwaymakingthedevelopmentofAIsoftwareeasierwillbringforthanewcropoffruitofadifferentkind. 1Whatcanwelearnaboutdeeplearning? A.Itreplacesartificialintelligence. B.Itattractsrockstarstopractice. C.Itscanspatternsforlargecompanies. D.Ithelpstechnicianstocreatesoftware. 2Fast.aiisanorganizationthat. A.ensuresonetoobtainaPhD B.teachescraftinivorytower C.offersacourseindeeplearning D.requiresweekstoapply 3TheunderlinedwordsNo.Greek.LettersinParagraph5meansdoingfast.aicourseis. A.easy B.difficult C.interesting D.boring 4Itcanbeinferredfromthelastparagraphthat. A.itisquitereliableforanyonetograspartificialintelligence B.theInternethasbroughtforthafloodofuselessAIsystems C.openinguptoallleadstoinstantglobalsearchandonlineshopping D.simplifyingsoftwaredevelopmentmayresultinunexpectedoutcomes
ItwasMother'sDaybuttheyoungmotherwasalittleunhappybecauseshewas800milesawayfromherparents.Inthemorningshephonedhermother1wishherahappyMother'sDayandhermothertoldheraboutthebeautifullilacs丁香inthegarden.2latethatdaywhenshetoldherhusbandaboutthelilacshesaidIknowwherewecanfindallthatyouwant.Getthechildrenandcomeon.Sotheywent3drivedownthecountryroads. Thereonasmallhilltheysawalotof4beautypurplelilacs.Theyoungwomanranquicklytoenjoytheflowers.Carefullyshepickedafewhereandafewthere.Ontheirwayhometherewasasmile5herface.ziliaoqun700292070 Whentheywerepassinganursinghome养老院theyoungwomansaw6oldgrannysittinginachair.Shehadnochildrenwithher.They7stopthecarandtheyoungwomanwalkedtotheoldwomanputtheflowersinher8handandsmiledather.Theoldgrannythankedheragainandagain.Shesmiledhappilytoo. Whentheyoungmothercamebacktohercarherchildrenaskedher9isthatoldgranny?Whydidyougiveourflowerstoher? Idon'tknowher10theymothersaid.Butit'sMother'sDayandshehasnochildren.IhaveallofyouandIstillhavemymother.Justthinkhowmuchthoseflowersmeanttoher.
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AphotographthatonehastakenofoneselftypicallywithasmartphoneorwebcamanduploadedtoasocialmediawebsiteisthedefinitionofselfieintheOxfordEnglishDictionary.Infactitwasn'teveninthedictionaryuntilAugustoflastyear.Itearneditsplacetherebecausepeoplearenowsoobsessedwith对……痴迷selfies﹣wetakethemwhenwetryonanewhatplaywithourpetsorwhenwemeetafriendwhomwehaven'tseeninawhile. Butisthereanyscientificexplanationforthisobsession?WellyoushouldprobablyaskJamesKilneraneuroscientist神经系统科学家atUniversityCollegeLondon. Throughourlifetimewebecomeexpertsatrecognizingandinterpretingotherpeople'sfacesandfacialexpressions.IncontrastaccordingtoKilnerwehaveaverypoorunderstandingofourownfacessincewehavelittleexperienceoflookingatthem﹣wejustfeelthemmostofthetime. ThishasbeenprovedinpreviousstudiesaccordingtotheBB24C. Kilnerfoundthatmostpeoplechosethemoreattractivepicture.Thissuggeststhatwetendtothinkofourselvesasbetter﹣lookingthanweactuallyare.TofurthertesthowweactuallyperceiveourownfacesKilnercarriedoutanotherstudy.Heshowedpeopledifferentversionsoftheirownportrait﹣theoriginalonethathadbeeneditedtolooklessattractiveandonethatwasmademoreattractive﹣andaskedthemtopicktheversionwhichtheythoughtlookedmostlikethem.Theychosethemoreattractiveversion. Butwhatdoesitsayaboutsettles?Wellisn'tthatobvious?Selfiesgiveusthepowertocreateaphotograph﹣bytakingitfromvariousangleswithdifferentposesusingfilters滤色镜andsoon﹣thatbettermatchesourexpectationswithouractualfaces. Yousuddenlyhavecontrolinawaythatyoudon'thaveinnon﹣virtual非虚拟的interactionsKilnertoldtheCanada﹣basedCTVNews.Selfiesallowyoutokeeptakingpicturesuntilyoumanagetotakeoneyou'rehappywithheexplained. 1Whatisthepassagemainlyabout? A.Thedefinitionandfunoftakingselfies. B.Theexplanationofwhypeoplelovetakingselfies. C.Howtakingselfiesinfluencespeople'sdailylives. D.Howtointerpretpeople'sfacialexpressionsintheirselfies. 2TheunderlinedwordperceiveinParagraph5canbereplacedby. A.interpret B.beautify C.choose D.destroy 3AccordingtoKilnerpeopleliketakingselfiesprobablybecausetheythink. A.itisagoodchancetolearnmoreabouttheiractualfaces B.itisawaytorespondtoothers'facialexpressionscorrectly C.itenablesthemtointeractwiththeirfriendsinsocialmedia D.itallowsthemtosatisfytheirexpectationswiththeirappearances
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DaniellaWridewasbrushingherdaughter'slongbrownhairwhenshenoticedthatwitheachcombmassesofthehairwerecomingout.ThatwasJanuary12017.Within20daysseven﹣year﹣oldGianessaWride'shairwascompletelygoneandherdoctorsaidthehairwouldnevergrowback.Gianessahadbecomeoneofthe6.8millionAmericanswithalopeciaanauto﹣immunediseasethatcauseshairloss. Alopeciaisn'tpainfulbutforkidswhosufferfromittheseverepaincomesfromstandingoutfromthecrowd.ForthemostpartthestudentsinGianessa'sfirst﹣gradeclassinSalemUtahwereunderstanding.ButtheoccasionaljokesofBaldymadeherfeellikeanabandonedchild.Ididn'twanthertofeelthatshewasn'tliketheotherkidshermothersaid.Itriedcoveringherbaldnessbuttheman﹣madehairwasuncomfortable. Thencomestheschool'straditionalCrazyHairDayinAprilagreatjust﹣for﹣funcelebrationwhereallthekidsandtheirparentscanexpresstheirwildsidesabit.DaniellaandGianessadecidedthatratherthanhideGianessa'sbaldnessundertheman﹣madehairtheywouldcelebrateit.Daniellaboughtscrapbook﹣stickerjewelsanddecoratedherheadwithflowereddesignsandevenadeer.TheyjustfitherpersonalityDaniellasmiled.She'ssolovely. OnthemorningofthecompetitionGianessawasnervous.Wouldherfriendsthinkitwasfunny?Howeverwithhermother'sencouragementshehadnothingtofear.ImpressiveGianessawasahitandawinnerofthecrazy﹣haircompetition.Gianessaisnowgladthatshedaredtogobare.IwassadatfirstwhenIlostallmyhairshetoldpeople.ButnowIlovebeingbald.Icandothingstomyheadthatotherkidscan't.I'mthinkingnowitmightbefuntodecoratemyheadwithsomecolorfulbutterfliesandflowers. 1WhywasGianessadifferentfromotherkids? A.Shewasbornbald. B.Shehadherheadfullyshaved. C.Shewastalentedinhairdesigning. D.Shesufferedfromhairloss 2HowdidothersreacttoGianessa'sdisease? A.Herdoctorwasquiteoptimistic. B.Hermothergaveherman﹣madehair. C.Herclassmateswereallconsiderate. D.Herschoolneverofferedherhelp. 3WhatcouldGianessadoontheCrazyHairDay? A.Shecouldshowherpersonality. B.Shecoulddecorateherhair. C.Shecouldshopscrapbook﹣stickers. D.Shecouldteaseothers. 4Whatisthemainideaofthetext? A.Theman﹣madehairbuiltupthegirl'sconfidence. B.Thegirlfacedherdiseaseinamostbeautifulway. C.Thecompetitionservedasawaytomakeachange D.Thediseasewascuredwithmother'sloveandcare.
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设函数fx=m+1x2﹣m2x+m﹣1. 1当m=1时解关于x的不等式fx>0 2若关于x的不等式∫x<0的解集为求m的值
TheSurprisinglyEasyTrickThatCanHelpYouUseYourPhoneaLittleBitLess ThefirstthingIdointhemorningsislookatmyphone.That'smainlybecausemyphoneismyalarmclockbutoncemyeyesareopenandthatscreenislitupinmyhandsit'sanawfullyshorttriptocheckingemailsandperusingheadlines.1Myemailsthatearlyinthemorningaremainlyjunkandtheheadlineswon'tchangemuchbeforeI'vebrushedmyteethandpouredacupofcoffeeright? MywifesaysI'maddictedtomyphone.2I'mnotterriblyactiveonsocialmediabutIdoenjoymesomeidlescrollingenjoyplayingthemobilephone.Andwowdothesetechcompaniesknowhowtokeepthosethumbsconstantlyswipingup. 3WhileIthinkwe'reprettygoodaboutlimitingherscreentimeitwouldseemthattechnologyhashaditshooksinmefromthestart.SoIdecidedtotrylooseningmyphone'sgrasponmyattentionbyswitchingthescreentoblackandwhite. Changingthedisplaytoblackandwhiteisveryeasy.InyouriPhone'ssettingschooseGeneralthenAccessibility.NextchooseDisplayAccommodationsthenColorFilters.Tapthetoggleonandalistoffiltersappears.4 ButnoonewantstogothroughallthiseverytimetheywanttoturncolorbackontocheckoutanInstagramstory.Clearlyyoudon'talwayswantyourscreentobeblackandwhite.Afteralltherewillunavoidablybephotostoviewandvideostoshare.5IntheAccessibilitymenutapAccessibilityShortcutandchooseColorFilters.Nowpressingthehomebuttonthreetimeswillswitchyourdisplaytocolorandthenbackwithanotherthree. A.There'snoreasonformetobedoingthis. B.We'vegotathree﹣year﹣oldchild. C.ChooseGrayscaleandyou'reallset. D.Itcanhelpyouuseyourphonealittlebitless E.IdisagreebutIcandefinitelystandtospendlesstimelookingatit. F.Herecomesasurprisinglyeasytrick. G.Thatiswhatmakessettingashortcutnecessary.
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假设你是红星中学高三学生李华请根据以下四幅图的先后顺序写一篇英文周记记录上周你和同学参与国家博物馆庆祝改革开放四十周年大型展览Celebrating40thAnniversaryofReformandOpening﹣up志愿者活动的全过程. 注意词数不少于60提示词国家博物馆theNationalMuseumofChina
Whetheryoulikeitornotasstudentsyouhavetolivewithroommatesaftergoingtoschooloruniversity.Havingaroommatecanbeoneofthebestexperiencesoreasilyoneoftheworst.1 Herearefivetipsforyoutofollowtoavoidthecommonmistakesthatmakegoodroommaterelationshipsworse. Talkthingsout.2Ifsomethinghappenssitdownwithyourroommatesandhaveaface﹣to﹣faceconversation.Complainingaboutyourroommatesbehindtheirbackscreatesnothingbutbadsituationsandgeneralunhappiness. 3Someroommatesbecomethebestoffriendsandsomedon't.Don'tputpressureonyourselforyourroommatetoreachthislevelespeciallywhenyoufirstmeet.Rememberyouaretryingtomakeanewfriendnotfrightenyourroommateaway.Andifyouroommatedoesn'tendupbeingyourbestfriendthereisnoneedtoworryaboutit. Cleanupafteryourself.Oratleastkeepyourthingsonyourside.4Butbeingconsiderate考虑周到的withwhereyouputyourownstuff东西willhelpyouavoidthearguments. Askbeforeyoutake.Thisappliesto适用于foodclothesandanythingelsethatyoudon'town.5Evenifyoubothagreetoshareeverythingyoushouldstillask. A.Don'texpecttobebestfriends. B.Communicationisofvital至关重要的importance. C.Youdon'tneedtokeeptheroomcleanandorganizedallthetime. D.Roomscanbereallyeasyforamesstopileup. E.Ifyouwanttohaveagoodrelationshipwithyourroommateitallstartswithyou. F.Trytomakeyourroommatesyourbestfriends. G.Showyourroommatethatyouhaverespectforhisorherthings.
有一款手机每部购买费用是5000元每年网络费和电话费共需1000元每部手机第一年不需锥修第二年推修费用为100元以后每一年的维修费用均比上一年增加100元.设该款手机每部使用x年共需维修费用fx元总费用gx元总费用一购买费用+网络费和电话费十维修费用 1求函数fxgx的表达式 2这款手机每部使用多少年时它的年平均费用最少
假设你是南阳中学的学生李华将参加主题为Let'spickupabookandread的英语演讲比赛.请你写一份演讲稿主要内容包括 1.目前很多学生课余时间沉溺于网络远离书本导致记忆力减退对学习失去兴趣等问题. 2.阅读的益处如开阔视野增强理解力提高成绩等. 注意1.词数100左右.演讲稿开头和结尾已给出但不计入总词数. 2.可适当增加细节以使行文连贯. Goodmorningeveryone I'mLiHuafromNanyangMiddleSchool.ThetopicofmyspeechisLet'spickupabookandread. Thankyou!
IntheUSAColumbusDayisinmofthearrivalofChristopherColumbusintheNewWorld.
A AtmyfirstclassintheForksHighSchoolMr.BannermyEnglishteachersentmetoanemptydeskatthebackwithout1introducemetotheclass.Itwasharderformynewclassmates2stareatmeinthebackbutsomehowtheymanaged.Ikeptmyeyesdownonthereadinglisttheteacherhadgivenme.Itwas3fairbasicBronteShakespeareChaucerFaulkner.I'dalreadyreadeverything.Thatwascomforting…andboring. B Yourteethmaybepartofyoursmile4theyhaveamoreimportantjob﹣theyrethefirststepintheprocessofdigestion.Youhavethree5kindofteeth.Intheveryfrontofyourmouthareeightflatthinteethcalledincisors.Theyareusedforcuttingandbitingfood.Nexttothesearepointedteethcalledcanines6alsohelpyoutearfood.Theremainingteetharemolars.Theseteethhaveflattopsforcrushingandgrindingthefood. C TheBeijingVanke﹣ShijinglongSkiResortislocated7YanqingDistrictanationaldemonstrationareaforecologicalconstruction.WithLongqingGorgetoitseastandGuantingReservoirtoitswestithasfreshairandan8impressenvironment.9buildin1999itwasthefirstlargeskiresorttobebuiltnearBeijing.In2016amassiverenovationproject10startbyVanketheBeijingBadalingTourismGeneralCompanyandtheoriginalBeijingShijinglongSkiResort.
It'sasadandfamiliarvoicethatweoftenhearinbigcitiesCanyousparesomechange? Usuallywhenfacedwiththatparticular1IhavefeelingsofguiltifIpassby2givingacoinortwo. Ihadthatfeeling3inVenicewhileonatourofItaly'sfamoussitesin2006.Ihadtakenrefugefromthe4inaquietcafé.Outsidetherewasanoldwomankneelingonthehardancientpavingstones5. Steady6oftouristswerewalkingpasther.Ayoungbackpackerstoodawayfromthecrowd7drinkinginthescenerybutInoticedtheyoungtravelerwasalso8theoldwoman. Atouristgroupwalkedalongthestreet9thewomanandwalkedon.10groupoftouristsarrivedandwalkedpasttheoldlady.Thebackpackerwatched11everybodyelsewentontheirwayfocusedonthe12aroundthem.ThenIwaspreparingtoleavewhenIcaughtsightofthebackpackersteppingforwardand13somemoneyinthewoman'scup.Hedidthissomewhat14justbeforethearrivalofanothertouristgroup.AsI15theleaderofthegroupstoppedandputsomemoneyinthecup.Havingbeenshownthewayothertouristsfollowedsuitand16somemorecoinstothecup. Hisworkdonetheyoungmanwalkedovertotheoldbeggar﹣womanpattedherontheshoulderandsaidIhopethat17alittle. Idon'tknowifthewomanunderstoodhisEnglishor18whathadjusthappenedbutIdid. Iplacedsomemoneyinthewoman'scupandcontinuedmytravels19afterwitnessingsuchan20actofkindness. 1A.sound B.question C.excuse D.command 2A.beyond B.after C.without D.before 3A.manytimes B.sometimes C.onlyonce D.onceagain 4A.crowds B.families C.streets D.signs 5A.singing B.crying C.begging D.trembling 6A.streams B.packs C.masses D.groups 7A.simply B.seemingly C.similarly D.specially 8A.showing B.following C.checking D.observing 9A.glancedat B.laughedat C.rushedat D.staredat 10A.One B.More C.Another D.Other 11A.if B.since C.because D.as 12A.stones B.sights C.signs D.tourists 13A.lending B.borrowing C.placing D.taking 14A.accidentally B.successfully C.deliberately D.cheerfully 15A.watched B.shown C.understood D.walked 16A.changed B.charged C.found D.added 17A.measures B.helps C.explains D.matters 18A.recognized B.caught C.realized D.figured 19A.pleasant B.annoyed C.disappointed D.delighted 20A.beautiful B.admirable C.pure D.accurate
Abdietandregularphysicalactivitywillhelpyoukeepfit.
ThemusicwaswrittenbyAbingafolkmwhowasborninthecityWuxiin1893.
BothEnglishandFrenchareolanguagesinCanada.
Tobehalotofpeopleattachgreatimportancetobecomingrichandfamous.
Althoughitisoftencalledthekoalabearthislovelyanimalisnotactuallyabearatall.Itisamarsupial有袋目哺乳动物andlikekangaroosafemalekoalacarriesherbabyinherpouch育儿袋foraboutsixmonths. KoalasliveinfourstatesonlyineasternAustraliawheretheeucalyptustrees桉树theylovearemostplentiful.Infacttheyrarelyleavethesetreestheirsharpclawseasilykeepingthemhighupintheair. Duringthedaytheysleepforupto18hours.Whennotasleeptheyfeedoneucalyptusleavesespeciallyatnight.Koalasdonotdrinkmuchwaterandtheygetmostoftheirwaterfromtheseleaves.Eachanimaleatsalargeamountforitssize﹣abouttwoandahalfpoundsofleavesadayevenstoringsnacksofleavesinpouches. Thekoalabearswerewidelyhuntedduringthe1920sand1930sandtheirpopulationsdecreasedsuddenly.Helpedbyreintroductiontheyhavereappearedovermuchoftheirformerrangebuttheirpopulationsaresmaller.Koalasneedalotofspace﹣aboutahundredtreesperanimal﹣whichisapressingproblemasAustralia'swoodlandscontinuetogetsmallerbecausethetreestheyliveonarebeingcutdowntomakefarms.Alsoforestfirescausedbyheatwavesaredestroyingtheforeststhekoalaslivein. Ithasbeenestimated估算thatthereareonly100000koalasleftinthewildwiththelowestestimatesbeingnomorethan43000.ThekoalacanonlyeateucalyptusleavesandlivesnowhereelseexceptAustraliasoinordertosurvivehumaneffectonitslimitedenvironmentmustbecontrolledorthisattractivecreaturefacescertainextinction. 1Whyarekoalasindangerofdyingoutaccordingtothetext? A.Manyofthemdiedintheforestfire. B.Theycan'tbeusedtotheglobalwarming. C.Theirlivingenvironmentisgraduallybeingworsened. D.Farmersareburningtheeucalyptustreesthatkoalasliveon. 2Whathappenedduringthe1920sand1930s? A.Koalasfacedgreatdanger. B.Koalagotwellprotected. C.Koalas'populationfellslowly. D.Koalahadenoughspacetolivein. 3Whatwilltheauthormostprobablytalkaboutnext? A.Howtoincreasekoalas'population. B.Howtomakethebestofthelimitedenvironment. C.Howtohelpkoalasgetusedtothenewlivingenvironment. D.Howtoreducehumaneffectonkoalas'livingenvironment.
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