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如图，AB为⊙O的直径，点C，D在⊙O上．若∠AOD＝30°，则∠BCD等于（ ）
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如图AB为⊙O.的直径点C.在⊙O.上若∠C.=15°则∠BOC=.
60°
45°
30°
15°
如图24127AB为⊙O.的直径点C.D.在⊙O.上.若∠AOD＝30°则∠BCD的度数是___
已知⊙O.的直径为10点A.点B.点C.在⊙O.上∠CAB的平分线交⊙O.于点D.Ⅰ如图①若BC为⊙
如图过⊙O上一点C作⊙O的切线交⊙O直径AB的延长线于点D.若∠D.=40°则∠A的度数为
20°
25°
30°
40°
如图所示AB是⊙O.的一条弦OD⊥AB于点C.交⊙O.于点D.点E.在⊙O.上1若∠AOD＝52°求
如图AB为⊙O.直径点C.D.在⊙O.上已知∠BOC=70°AD∥OC则∠AOD=.
如图AB为⊙O的直径点CD在⊙O上．若∠AOD=30°则∠BCD的度数是度．
如图所示AB是⊙O.的一条弦OD⊥AB垂足为C.交⊙O.于点D.点E.在⊙O.上.1若∠AOD=52
如图AB是⊙O.的直径点C.是⊙O.上的一点若BC＝3AB＝5OD⊥BC于点D.则OD的长为.
如图点C.D.两点在以AB为直径的⊙O上AD∥OC∠BOC＝110°则∠AOD=
如图所示AB是⊙O.的一条弦OD⊥AB垂足为C.交⊙O.于点D.点E.在⊙O.上.1若∠AOD=52
如图24—
—4，AB为⊙O.的直径，点C.在⊙O.上，若∠
=60°，则∠A.等于（ ） A.80°B.50°
40°
30°
如图AB是⊙O的直径弦CD⊥AB于点E点M在⊙O上MD恰好经过圆心O连接MB.若CD＝16BE＝4求
如图2417AB是⊙O.的一条弦OD⊥AB垂足为点C.交⊙O.于点D.点E.在⊙O.上.1若∠AO
如图AB为⊙O的直径点CD在⊙O上．若∠AOD=30°则∠BCD的度数是度．
如图AB为⊙O.的直径点C.D.在⊙O.上.若∠AOD=30°则∠BCD的度数是
75°
95°
105°
115°
如图已知BD是⊙O.的直径⊙O.的弦AC⊥BD于点E.若∠AOD=60°则∠DBC的度数为
A.30°
40°
50°
60°
如图AB是⊙O.的直径AC切⊙O.于
，BC交⊙O.于点D.，若∠C.=70°，则∠AOD的度数为（ ）
A.70°
35°
20°
40°
如图AB是⊙O的直径点D在⊙O上∠AOD＝130°BC∥OD交⊙O于C求∠A的度数.
如图AB为的⊙O.直径点C.D.在⊙O.上若∠DCB=30°则∠DBA=°.
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如图抛物线Ly＝﹣x2+bx+c与x轴分别交于A﹣10B40两点． 1求抛物线的解析式以及顶点坐标 2在第二象限内作矩形ADCE且AD＝2CD＝4将抛物线x轴向左平移当点C落在平移后的抛物线L′上时求平移后的抛物线L′的解析式 3在2的条件下当点M是抛物线L的对称轴上一点试探究在抛物线L向左平移第一次过点C时抛物线L′上是否存在点Q使以点O点B点M点Q为顶点的四边形是平行四边形若存在请写出点Q的坐标若不存在请说明理由．
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假定你是李华你的新西兰笔友CharLie打算今年7月到中国旅游他发邮件向你询问有关情况请根据以下要点用英语给他回复. 1.髙铁飞机等方便快捷; 2.人脸识别即可进入景区; 3.无现金支付随处可用. 注意: 1.词数10左右; 2.可以适当增加细节以使行文连贯; 3.开头和结尾已为你写好不计入总词数. 参考词汇:人脸识别facialrecognition HiCharLie _____ Yours LiHua
Parrotshavebeenknowntomimicwordsbuthaveyoueverthoughthowtheycommunicate?Thesoundstheymakemaysoundmeaninglesstousbutnewresearchhasfoundthatwildparrotsareactuallygivennamesbytheirparents. AccordingtoastudyledbyKarlBergofCornellUniversityintheUSnestlings雏鸟aregivenauniquesoundoftheirownwhichstayswiththemfortheirentirelives. Inthestudytheteamplacedhiddencamerasinthenestsof17differentwildparrots.Afterstudyingtheirsoundstheteamfoundslightdifferencesinthecallsparentsusedtocommunicatewitheachchick.Andevenbeforethenestlingshadlearnedtocommunicateproperlythebabybirdsseemedtorecognizeandmimictheircalls. Soundsverysimilartohumansdoesn'tit? Thestudyalsoprovedthatthesesignaturecallsareacquiredsociallynotgenetically.Todothisscientistsswitchedtheeggsinnineofthe17nestssothathalfoftheparrotswereraisingnestlingsthatwerenottheirs.Usingtherecordingsthescientistsconcludedthenestlingsallusednamessimilartothosetheparentswhetherbiologicalornonbiologicalcalledthemforthefirstweeksoftheirlives.LucieMcNeilfromNationalGeographicsaidthiswouldbethefirstprovenexampleofanon﹣humanspeciesteachingacoustical声学的communication. LeadscientistforthestudyKarlBergtoldNationalPublicRadiooftheUSMostpeoplesay‘Wellallthosecallsarejustnoise'butIthinkthey'rehavingconversations. WhenaskedwhatelsetheparrotsmightbesayingBergrepliedThetheoryisthatthesebirdsaredecidingwherethefoodis.Dowewanttogo3kmNorth﹣northwest?Dowewanttogotothatfield?'Theyaresortofarguingordiscussing.NaturalscienceauthorVirginiaMorellwrote:Verygraduallyscientistsarelearningtounderstandtheconversationsofverydifferentanimalsthatlivelivesrichwithplansquarrelsandromance. Youneverknowifthescienceofanimaltranslationkeepsadvancingwemightonedaybewatchingarealityseriesaboutparrots. 1Whatdidthenewresearchfindaboutwildparrots? A.Theycantalkbylearningfrompeople. B.Thesoundstheymakearemeaningless. C.Theyhavenamesgivenbytheirparents. D.Theyhaveauniquewayofmakingsounds. 2Whichofthefollowingmaythescientistsagreewith? A.Differentparrotsarecalleddifferentlybythetheirparents. B.Babyparrotscantellwhotheirbiologicalparentsare. C.Babyparrotscanmimictheirbiologicalparents'callsbetter. D.Parrotsarethemostskilledanimalsinacousticalcommunication. 3Whydidthescientistsswitchtheeggsinthestudy? A.Toseewhethertheparentscouldrecognizetheirownbabies. B.Toseewhethertheparrotsmadethesamesoundsalltheirlives. C.Toseewhetherthesignaturecallswereacquiredsociallyorgenetically. D.Toseewhetherbiologicalandnonbiologicalparentsnamedbabiesdifferently. 4Whichofthefollowingisthebesttitleofthepassage? A.AnewresearchintheUS B.Parrotscanreallytalk C.Conversationsofanimals D.Parrotsmakemeaninglesssounds
在校园文化艺术节中九年级一班有1名男生和2名女生获得美术奖另有2名男生和2名女生获得音乐奖． 1从获得美术奖和音乐奖的7名学生中选取1名参加颁奖大会求刚好是男生的概率 2分别从获得美术奖音乐奖的学生中各选取1名参加颁奖大会用列表或树状图求刚好是一男生一女生的概率．
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Arubaisoneofthemostwell﹣knownCaribbeandestinationsfortouristsaroundtheworld. You'reprobablywonderingwhattoincludeaswellaswhattowearwhileyou'reinAruba. Clothes Themainreasonwhyyou'reheadingthereistorelaxonthecountry'sfreshbeachesandjoyinwarmwatersoftheCaribbeanSea.Duringmostofthedayyou'lllikelybewearingyourswimsuit.Whenyou'refinishedatthebeachorpoolareaitisadvisabletobringalongashirtorcoveraswellasshortstowear. Itisnotrecommendedtowearbeachclotheswhenyougooutfordinner﹣regardlessofthetimeofday.ShortsandT﹣shirtsareenoughinmanyrestaurantsalthoughmoreformalclothesareadvisedforthefanciesteatingestablishments. Whatelsetobring? TheCaribbeansunisverystrongandifyou'replanningonspendinglotsoftimeinthesunthereareseveralprecautionsyoumusttake.Includesuncreamsunglassesawidehatacoupleofbathingsuitsaswellasabeachbagandacoolerinyourluggage. WhatNOTtobring? WhiledrinkingwaterisquestionableornotsafeinmanyCaribbeannationsArubaisanexception.Arubaisknownforhavingthecleanestwaterintheworld.Thereisnoneedtobringwatersimplybringalonganemptybottle. SeveralitemsareprohibitedinArubaforcarrying.Theseincludefirearmse﹣cigarettesaswellassharpobjectsandtools. 1TouristschooseArubaforadestinationmainlybecause. A.theycanwearcasualclothesfreely B.theycanenjoythebeautifulscenery C.theycanrelaxonthebeachandinwaters D.theycanhaveawonderfuldinnerpartythere 2WhichofthefollowingisnotadvisedtodoinAruba? A.WearingaT﹣shirtinarestaurant. B.Preparingsuncreaminadvance. C.Wearingbeachclothesfordinner. D.Takingalongsunglassesbeforegoingout. 3Thepurposeofthetextisto. A.provideinformationfortourists B.offeradviceontravellinginAruba C.attractmoretouriststotravelinAruba D.warntouristsagainstdoingwrongthings
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Chinaishometodifferentkindsofsoybeans.In2011thesoybeanoutputofChinadropped1thefourthplacearoundtheglobe2accountforonly5.55%oftheworld'stotal.Chinanowrelies3muchonimporttomeetadomestic国内的needfortheplantthanever. ActuallyGaiJuyiisoneofthemillionsofdiligentChinesepeople4workhardtochangethesituation.Forovertwo5decadeGaiandhisteamwentintovariousfieldsacrossthecountryjusttocollectseedfromthefarmers.Noneoftheseedsisthesame.hesaid.Seedcollectionisalreadynoeasyjob.Andtheyeven6havetodelaytheprocessfromtimetotimebecauseofalackoffundingmanyofGai'sstudentsleft7industryforthesmallfinancialpayback.8Gaihasremainedinhispostandsparednoeffortsinlookingafterthepreciousseeds. ThehardworkofGaiandhisteam9finalpaidoff.ThankstothemChina'ssoybeanharvestdoubledovertheyears.TheoldmansaidIknow10mypersistencemeanswhenIseeself﹣producedtofuandsoybeanmilkonChinesepeople'stable.
如图AD是⊙O的切线A为切点．点C在⊙O上连接BC并延长交AD于点D若∠AOC＝70°则∠ADB＝
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号Λ并在其下面写出该加的词. 删除:把多余的用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第l1处起不计分. Withinafewmonthwearegoingtohaveanewsetofbanknotes.Thesebillswillhavenewsecurityfeaturesthatwillmakeprintingfakemoneyevenharder. We'vebeenusingbanknotesforaround1000years.BackintheNorthernSongDynastytheworld'searliestpapermoneynamingjiaoziwasmadebyChinesepeople.Obviouspapermoneyischeapertomakeandeasytocarrythanmetalcoins.Butnowinthedigitalagepapermoneyseemedtobedisappearing.Fromsupermarketstostreetstalls小摊peoplepaybyusetheWechatWalletandAlipayappsonyourphones.Butsomesayitmaybetakealittlelongerthanyouthinkseepapermoneygoaway.
ImpressionWestLakeisagrandeveningshowofmusiclightanddance.DirectedbyZhangYimoutithasbeenupdatedsince2015.Includedinthenewversion1be70percentofelements要素fromHangzhouG20Summiteveninggain. ImpressionWestLakeshowingthelocalcultureofHangzhouandtheuniquecharmoftheWestLakeisoneofChina'sTopSevenShows.It2impressivepresentsthehistoryandcultureoftheWestLakeby3explorethestoriesbasedontheLegendofWhiteSnakeandButterflyLovers. BesidesasacharmingshowImpressionWestLakealsohighlightsthebeautiful4naturelandscape风景oftheWestLake.Thewholeperformanceisstagedentirelyuponthelakeitselfwith5hillasthebackground.6isevenmoreamazingistheRainoftheWestLakewhichisartificiallyrecreated7bringoutthecharmoftheWestLakeintherain. ImpressionWestLakeisalsoafeastofmusic.8isreportedthebackgroundmusicismadebyKitaroafamousJapanesemusicianandthethemesong9performbyZhangLiangyingapopularChinesesinger10apleasantandenjoyablevoice.Allthesebringtheaudienceintothedreamlikeenvironmentofromantic浪漫的Hangzhou.
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1x﹣2y2﹣x﹣2yx+2y 2x+1﹣+
如图在RT△ABC中∠ABC＝90°．AB＝2．BC＝2以点B为圆心AB的长为半径作圆交AC于点E交BC于点F阴影部分的面积为．结果保留π
Canyouimaginedigginginyouryardonedayandfindingalife﹣sizedsoldiermadecompletelyofclay?That'swhathappenedseveraldecadesagowhenfarmersinXi'anChinawerediggingwells. Archaeologists考古学家havesincefoundabout6000moreofthesesoldiersalongwithhorsesweaponstoolsandotherartifacts.ThehugearmywasmeanttoprotectthetombofthefirstrulerofChina.ThefirstemperorofChinaQinShihuangaccomplishedahugeamountduringhisrule.Between221and210B.C.hestartedtheconstructionoftheGreatWall.Hebuiltalargenetworkofroads.Heintroducedanewwritingsystemcurrency货币andasetofmeasurements.Theemperoralsoorderedtheconstructionofahugearmyoflife﹣sizedterracottasoldiers.Thesehehopedwouldprotecthistombafterhisdeath. ThesoldiersinXi'an'sterracottamuseumaretodaylightbrownbuttheyweren'talways.Theybeganasanarmyofredblueyellowgreenwhiteandpurple.Sadlymostofthecolorsdidnotlasttothepresentday.Afterbeingexposedtoairduringexcavation挖掘thecoatingunderthepaintbegantofalloff.Thepaintdisappearedinlesstimethanittakestoboilaneggtakingwithitimportantpiecesofhistory. Nownewtechniquesarestartingtorevealthearmy'struecolors.Archaeologistshaverecentlydiscoveredanareawithmorethanahundredsoldiers.Manyofthesestillhavetheirpaintedfeaturesincludingblackhairpinkfacesandblackorbrowneyes.ChineseandGermanresearchershavedevelopedaspecialliquidtohelppreservethesoldiers'colors.Aftertheyfindasoldierorotherartifacts手工艺品archaeologistssprayitwiththeliquid.Theythencoveritinplastic.Archaeologistsarealsofindingcolorsinthedirtaroundthesoldiers.It'simportantnottodisturbthedirtsothecolorswon'tbelost.WearetreatingtheearthasanartifactsaysarcheologistRongBothemuseum'sleadingchemist.ThenextchallengesaysRongistofindawaytoapplythecolorstothearmyagain.OncethathappensartistscanbringEmperorQin'sarmybacktolifeinfullvividcolor. 1Theterracottasoldierswereconstructedto. A.showtheoutsideworldaboutChina'sgreatness B.beenjoyedbyeverydaypeople C.frightenChina'senemies D.protectEmperorQin'stomb 2Whatisthemainideaofthethirdparagraph? A.Thesoldierslosttheircolorsveryquickly. B.Thesoldiers'paintfelloffbecauseofthehightemperature. C.Visitorstothemuseumarenotactuallyseeingtherealsoldiers. D.Beingexposedtowaterisbadforthesoldiers. 3Whathavearchaeologistsrecentlydiscovered? A.Aplacewithoverahundredsoldiers. B.Awrittendescriptionofthesoldiers'truecolors. C.Aspecialliquidinthetombtopreservethesoldiers'colors. D.AnewtombforEmperorQin. 4WhichstatementwouldRongBoprobablyagreewith? A.Thesoldiersshouldstayintheircurrentbrowncolor. B.Artistsshouldbeabletopaintthesoldiersinanycolortheywant. C.Archaeologistscanonlyguessatthesoldiers'originalcolors. D.Weshouldtrytorestorethearmy'svividcolors.
如图在△ADE中BC∥DEAB＝3BD＝DE＝6则BC的长是
下列各数中最大的数是
MyhusbandandIonlyhaveonecar.SoafterworkIalwayswalktohisofficeandwaitforhimto1mehome. OnedaywhileIwaswaitingforhimabeautifulcar2nearme.IwasbusilyadmiringthecarwhenI3thedriver.Honestlyshewasprobablythe4womanIhadeverseenoutsideofamoviescreen.Her5wereasblueasseaandshehadteethlikeanevenrowofpearls.Minuteslateramancameoutofthebuildingandwalkedovertoher.Theykissedanddroveoff. Sittingthere6injeansandaT﹣shirtIwantedtocry.Itisso7thatpeoplehaveitall. ThenextweekIsawheragainandafterthatitbecamealmost8toseeher.Iwould9ifsheandherhusbandateoutalotandwheretheywent.Iwantedherto10thecarsoIcouldseeherinfulllength.Didshe11classyhigh﹣heeledshoes? Afewweekslaterthisquestionwas12forme. Iwaswaitinginmyusualplaceandthewoman'shusbandcameovertotheircar.Heopenedthedoor.13theprettywomanwalkedaroundtothepassengerside14onawalkingstick.She15onelegwithherhandsandthentheotherone;shehadaprosthetic假肢onherleftlegandabrace支架herrightone. AstheydroveawayIbegantocry.WhenmyhusbandarrivedItoldhimwhathad16.Hesaidheknewherhusbandandthatwhentheladywas12yearsoldshehadbeen17inacarthatgotstuckontherailroadtracks.Bothherparentswerekilled.Therailcompanymadealargesettlementwithherbecausethecrossinghadno18;thatiswhysheownedsuchanicecar. ForweeksIhad19thiswomanandherwayoflife.NowIrealizehowluckyIam.Whenyoumeetapersonwhoseemstobemuchbetteroffthanyoudon'tbefooledby20. 1A.walk B.drive C.fly D.ship 2A.rangup B.spedup C.wentup D.pulledup 3A.noticed B.recognized C.greeted D.observed 4A.prettiest B.proudest C.strictest D.strongest 5A.fingers B.ears C.eyes D.nose 6A.covered B.wrapped C.put D.dressed 7A.touching B.unfair C.interesting D.surprising 8A.boring B.stressful C.routine D.amusing 9A.refer B.whisper C.wonder D.expect 10A.getoutof B.getinto C.goup D.gothrough 11A.wear B.oppose C.abuse D.ban 12A.raised B.handled C.solved D.answered 13A.Immediately B.Slowly C.Curiously D.Fortunately 14A.putting B.carrying C.turning D.leaning 15A.pressed B.skipped C.lifted D.slid 16A.disappeared B.changed C.happened D.lost 17A.limited B.trapped C.lost D.sunk 18A.announcement B.signals C.appeal D.station 19A.envied B.ignored C.respected D.understood 20A.confidence B.confusion C.ambition D.appearance
如图某数学兴趣小组为测量一棵古树BH和教学楼CG的高先在A处用高1.5米的测角仪测得古树顶端H的仰角∠HDE为45°此时教学楼顶端G恰好在视线DH上再向前走7米到达B处又测得教学楼顶端G的仰角∠GEF为60°点ABC三点在同一水平线上．1计算古树BH的高2计算教学楼CG的高．参考数据≈1.4≈1.7
国际油价随着供需关系持续波动特别是主要产油国的日产量会影响油价的走势某段时间某石油输出大国每天石油的日产量约为1200万桶时石油的国际油价是每桶56美元每桶成本约为40美元．据统计当日产量减少50万桶时每桶国际油价将会提高7美元但当每桶价格高于100美元时石油需求量又会大幅减少从而严重影响该国的国家经济 1若某段时间该国当日的石油日产量最多1050万桶则国际石油的价格最低是多少美元桶 2该国为了实现一天的利润为3300万美元则日产量是多少万桶
NewYorkCitymuseumshavefilled2019withexcitingexhibitions.Herearehighlightsasyouschedulethatleisuretime: TheStatueofLibertyMuseum LibertyIsland StartingMay16 AbrandnewmuseumabouttheStatueofLibertyisopeningonLibertyIslandwiththreeroomswithinthespaceincludinga3Dimmersive拟真的theaterthatwillplayan8﹣to﹣10﹣minutefilmthattellsabriefhistoryofitsbeginningsanditsmeanings. 'CyclingintheCity' MuseumoftheCityofNewYork JulythroughDecember TheMuseumoftheCityofNewYorkisopeninganewexhibitaboutthehistoryofcyclingandthecity'srelationshipwithitcalledCyclingintheCity:A200﹣YearHistorythrough50objectsincluding14bicyclesphotographsandcyclingclothing.TheexhibitionwillalsofeatureancientandmodernfilmsshownonalargescreenwhichwillenablevisitorstoexperiencevirtualcyclinglandscapesviaZwiftanonlinecyclingvideogame. 'ShePersists:ACenturyofWomenArtistsinNewYorkCity' GracieMansion StartingJuly14 With60worksbymorethan40artistsGracieMansioniscelebratingtheexcellentworksofwomenwhocalledNewYorkhomeinthisnewexhibit.Thepaintingsfilmphotographycraftanddesignaredividedintothreethemes:bodyasabattlegroundpicturingpeopleandexpandingabstraction. MuseumoftheDog 101ParkAve. StartingOct.6 Anentireartmuseumaboutdogshasarrivedin Manhattanwithalargetwo﹣floorcollectionofpaintingssculpturesandrarepiecesfromfamousdogartists.ThereareinteractiveexhibitslikeaFindYourMatchandaMeettheBreedstouchscreenwhereyoucanexploredifferentbreeds'featurestraitsandhistories. 1Atwhichplacecanpeoplelearnthehistoryofcycling? A.LibertyIsland B.MuseumoftheCityofNewYork C.GracieMansion D.101ParkAve. 2WhichofthefollowingisNOTopenduringthesummercamp? A.TheStatueofLibertyMuseum B.'CyclingintheCity' C.'ShePersists:ACenturyofWomenArtistsinNewYorkCity' D.MuseumoftheDog 3Whichofthefollowingisatraditionalexhibitionwithoutusingdigitaltechnology? A.TheStatueofLibertyMuseum B.'CyclingintheCity' C.'ShePersists:ACenturyofWomenArtistsinNewYorkCity' D.MuseumoftheDog
Imagineyouareopeningyourowncompanyandwanttohireamanager.Youhavetwoapplicantsandtheyarebothskilledandexperiencedsowhowouldyouratherhire:JuliaWatsonorShobhaBhattacharya?ChancesarcthatyouwouldpreferWalsonright?Butwhy? EasynamesareregardedasmorefamiliarlessriskyandlessdangerousErynNewmanascientistatVictoriaUniversityofWellingtonNewZealandtoldScientificAmerican.Asaresultpeoplewitheasiernamesareoftenconsideredtobemoretrustworthy. ThisiswhatNewmanandherteammateshavefoundintheirrecentstudy.Intheexperimenttheypicked218differentforeignnamesincludingdifficult﹣to﹣pronounceoneslikeYevgeniDherzhinskyandeasynameslikeBodoWallmeyer.Theythenattachedeachnamewithastatementsuchasturtlesaredeafandgiraffesaretheonlymammalsthatcannotjumpandaskedvolunteerswhethertheythoughtthestatementsweretrue.Theresultsshowedthatstatementsconnectedtoeasiernamesweremoreoftenrankedasbelievablethanthosebelongingtodifficultnamesregardlessofwhatthetruthreallywas. Infactpreviousstudieshavealreadyfoundthatourjudgmentsaboutproductscanbeaffectedbytheirnames.Forexamplewetendtothinkofafoodadditivewithaneasiernameassaferandastock股票withaneasiernameasmoreprofitable赢利的accordingtoMedicalDaily.Butresearcherspointedoutthatthiseffectcanchangedependingonwheresomeonecomesfrom.ForexampleanativeBritishmanmayfindYevgeniDherzhinskyhardtopronouncewhileRussianpeoplecansayitwithouteffort. Newmanhopesthatthisfindingcanmakeusbetterseeourbias.It'snotjustunfairtopeoplethatwemakejudgmentsbasedonfeelingsratherthanfacts﹣itcansometimeshaveseriousresults.Forexamplewemaychoosetobelievecertaineyewitnessesincourtsimplybecausetheirnamessoundmoretrustworthyeveniftheyareactuallylying.Orwemayletgoofqualifiedjobapplicantsduetotheirdifficultnames. NowifyoucouldmakethatdecisionagainwouldyoustillpreferJuliaWatsontoShobhaBhattacharya? 1WhydoestheauthorrefertothechoicebetweenthetwonamesinParagraph1? A.Tointroducehowtochooseagoodapplicant. B.Toshoweasynamesareconsideredmorerisky. C.Toexplainwhatkindsofapplicantsareconsideredreliable. D.Tomakereaderswonderwhyapplicantswitheasynamesarepreferred. 2WhatdidNewmanandherteammatesdiscoverintheirexperiment? A.Hard﹣to﹣pronouncenamesdidn'tinfluencehowthevolunteersjudged. B.Statementspairedwitheasynameswereratedasreliableinmanycases. C.Volunteerswitheasiernamesweremorelikelytochoosetruestatements. D.Statementsconnectedwithdifficultnamesweremoretrustedbyvolunteers. 3TheunderlinedwordbiasinParagraph5probablymeans A.realfact B.wisejudgment C.goodunderstanding D.unreasonablepreference 4Whatcanbeconcludedfromthepassage? A.Weshouldthinktwicebeforewemakeadecision. B.Russianshavemorefairnesstopeople'snamesthantheBritish. C.Judgingpeoplebasedontheirnamesmaycauseseriousproblems. D.Theharderyournameispronouncedthemorelikelyyouwillgetajob.
Manyscientistsbelieveourloveofsugarmayactuallybeanaddiction瘾.Whenweeatordrinksugaryfoodsthesugarentersourbloodandaffectspartsofourbrainwhichmakesusfeelgood.Thenthegoodfeelinggoesawayleavinguswantingmore.1Inthiswayitisinfactanaddictivedrugonethatdoctorssuggestweallcutdownon. ItseemslikeeverytimeIstudyanillnessandsearchforthefirstcauseIfindmywaybacktosugarsaysscientistRichardJohnson2Why?SugarwebelieveisoneofcausesoftheproblemifnotthemajorreasonsaysJohnson. Ourbodiesaredesignedtosurviveonverylittlesugar.Earlyhumansoftenhadverylittlefoodsoourbodieslearnedtobeveryefficientinstoringsugarasfat.Inthiswaywehadenergystoredforwhentherewasnofood.Buttodaymostpeoplehavemorethanenough.3Wellwhatisthesolution?It'sobviousthatweneedtoeatlesssugar.4Frombreakfastcereals谷物toafter﹣dinnerdessertsourfoodsareincreasinglyfilledwithit. 5Manyschoolsarereplacingsugarydessertswithhealthierfoodlikefruit.Otherschoolsarcgrowingtheirownfoodingardensorbuildingfacilities设施likewalkingtrackssostudentsandothersinthecommunitycanexercise. A.Buttherearethosewhoarefightingbackagainstsugar. B.High﹣sugarfoodscannegativelyaffectyourenergylevels. C.Sotheverythingthatoncesavedusmaynowbekillingus. D.Alltastyfoodsdothisbutsugarhasaparticularlystrongeffect. E.Thetroubleisintoday'sworldit'sextremelydifficulttoavoid. F.Theaveragepersontakesinabout24kilogramsofsugareachyear. G.1/3ofadultsworldwidehavehighbloodpressureand2.5billionsufferfromobesity.
如图1在▱ABCD中BE⊥BC交AD于E且BE＝BCCF平分∠BCD交AB于F交BE于G连接EF． 1若∠A＝60°CG＝4求EF的长 2如图2若BM平分∠ABE交GF于点M且EF＝GB求证AE+FM＝CD．
如图矩形ABCD中AD＝3AB＝18EF分别为ADBC上一点连接EF将四边形AEFB沿EF翻折使AB的对应点A′B′与C在一条直线上A′E交BC于G若AB＝BF则GC长．
为庆祝新中国成立七十周年你们学校即将举办一次大型文艺汇演GrandArtandCulturalShow.假如你是李华请给你们学校留学生Eric写一封邮件邀请他参加观看. 内容包括: 1.汇演时间和地点; 2.汇演内容和意义. 注意: 1.词数:100左右. 2.可以适当增加细节以使行文连贯.
如图是重庆某轻轨站入口扶梯建设示意图．起初工程师计划修建一段坡度为32的扶梯AB扶梯总长为15米．但这样坡度太陡扶梯太长容易引发安全事故．工程师修改方案修建ACDE两段扶梯．并减缓各扶梯的坡度．其中扶梯AC和平台CD形成的∠ACD为135°．从E点看D点的仰角为36.5°AC段扶梯长18米．则DE段扶梯长度约为米参考数据sin36.5°≈cos36.5°≈cos36.5°≈tan36.5°≈
Theinternetisn'talwaysahappyplace.Buttherearegroupstryingtochangethat.KuakuaqunorpraisinggrouponWechatinwhichpeoplesendoutcomplimentsandpositivemessagesarebecomingpopularamonguniversitystudentsinChina. PraisinggroupshavebeenfoundedbystudentsfromseveraluniversitiessuchasFudanUniversityCommunicationUniversityofChinaHuazhongUniversityofScienceandTechnology.PeoplecanevenbuymembershipsofsuchgroupsononlineplatformslikeTaobao.Onceadmittedtheymakecomplimentarycommentsabouteachotherandevenasktobecomplimentedonparticularthings. ThepraisinggroupscomeatatimewhenthementalhealthofyoungChineseisgettingattention.AsyoungChineseseekcompanyandconfidencethepraisinggroupsmeetalotofpsychologicalneeds.ThegroupallowsmetoseethegoodqualitiesinmyselfthatIoftenoverlookandlookatthebrightsideofeverything.KindnessfromstrangerscanhelpmefeelmuchbetterTianJiayin22toldChinaDaily. ThepopularityofchatgroupsisalsoareflectionofChineseculturereportedGlobalTimes.AsmanyyoungChineseareraisedtobemodestit'suncommonforthemtoopenlyseekandgivepraise.Asaresulttheydesirecomplimentsastheygrowup.Ifthekidsgotmorepraisefromparentsandteacherstheirdesireforpraisewouldn'tbesostrongsaidDaiJiapsychologistfromHunanUniversityofCommerce. ButChenKanapsychologistfromFudanUniversitywarnedthatmembersofpraisinggroupsshouldbecautiousaboutgivingorreceivingpraise.Thebiggestriskistheconstantemphasisonthe‘falseself'whichmakesithardertoseethe‘trueself'shesaid. 1WhatdoestheunderlinedwordcomplimentsinParagraph1mean? A.praises B.questions C.advice D.information 2WhydomanyChineseuniversitystudentslikeKuakuaqun? A.ItgivesthemadiscountonTaobao. B.Ithelpsthemwiththeirstudies. C.Itmakesthemfeelconfident. D.Ithelpsthemmakenewfriends. 3WhatdoesChenKanthinkofgivingorreceivingpraise? A.Receivingpraiseismorehelpfulthanbeingmodest. B.Parentsandteachersshouldgiveyoungpeoplemorepraise. C.kidsshouldbeencouragedtoopenlyseekandgivepraise. D.Toomuchpraisemightstopkidsfromseeingtheirtrueselves. 4Whatisthemainideaofthearticle? A.Tipsforgettingmotivated B.ThelostgenerationinChina C.OriginofthepraisingcultureinChina D.AdvantagesanddisadvantagesofKuakuaqun
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