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有机物命名正确的是( )
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按照有机物的命名规则下列命名正确的是
1,2-二甲基戊烷
2-乙基丁烷
3-乙基己烷
3,4-二甲基戊烷
丙烷的分子结构可简写成键线式结构有机物
的键线式结构为
,有机物
与等物质的量的H
2
发生加成反应可得到有机物A.下列有关说法错误的是 A.有机物A.的一氯取代物只有4种 B.用系统命名法命名有机物A.,名称为2,2,3-三甲基戊烷
有机物A.的分子式为C
8
H
18
B.的结构可能有3种,其中一种名称为3,4,4-三甲基-2-戊烯
有机物的种类繁多但其命名是有规则的.下列有机物命名正确的是
2﹣乙基丁烷
CH
3
CHBr
2
二溴乙烷
2﹣甲基丁烯
苯甲醇
根据名称写出下列有机物的结构简式并判断下列有机物命名是否正确如不正确指出错误原因然后再写出正确命名.
根据名称写出下列有机物的结构简式并判断下列有机物命名是否正确如不正确指出错误原因然后再写出正确命名.
有机物的种类繁多但其命名是有规则的下列有机物命名正确的是
1,4-二甲基丁烷
3-甲基丁烯
2-甲基丁烷
CH
2
Cl-CH
2
Cl 二氯乙烷
有机物的种类繁多但其命名是有规则的下列有机物用系统命名法命名正确的是
1,4—二甲基丁烷
3—甲基丁烯
2—甲基丁烷
二甲苯
按要求回答下列问题1命名为2-乙基丙烷错误原因是__________________________
根据名称写出下列有机物的结构简式并判断下列有机物命名是否正确如不正确指出错误原因然后再写出正确命名.
根据名称写出下列有机物的结构简式并判断下列有机物命名是否正确如不正确指出错误原因然后再写出正确命名
1用系统命名法命名下列有机物2下列有机物的命名均有错误请用系统命名法正确命名①2-甲基-2-乙基丙烷
根据名称写出下列有机物的结构简式并判断下列有机物命名是否正确如不正确指出错误原因然后再写出正确命名
丁烷的分子结构可简写成键线式结构有机物A.的键线式结构为有机物B.与等物质的量的H2发生加成反应可得
下列对有机物的命名正确的是
3—甲基—2—丁烯
2—乙基丙烷
2—甲基—2—丁炔
2—甲基—2—丁烯
丁烷的分子结构可简写成键线式结构有机物A.的键线式结构为有机物B.与等物质的量的H2发生加成反应可得
丙烷的分子结构可简写成键线式有机物
的键线式结构为
,有机物
与等物质的量的H2发生加成反应可得到有机物A.。下列有关说法不正确的是( ) A.用系统命名法命名有机物A.,名称为2-甲基戊烷 B.有机物A.的一氯取代物有4种
有机物A.的分子式为C.6H14
B.的结构可能有4种
根据名称写出下列有机物的结构简式并判断下列有机物命名是否正确如不正确指出错误原因然后再写出正确命名
有机物
的键线式结构为
,有机物
与等物质的量的H
2
发生加成反应可得到有机物A.。下列有关说法错误的是 ( ) A.有机物A.的分子式为C
8
H
18
B.用系统命名法命名有机物A.,名称为2,2,3-三甲基戊烷
有机物A.的一氯取代物有4种
B的可能结构有3种,其中一种名称为3,4,4-三甲基-2-戊烯
有机物的种类繁多但其命名是有规则的下列有机物命名正确的是
CH
2
=CH-CH=CH
2
1,3—二丁烯
甲基苯酚
2—甲基丁烷
有机物的正确命名为有机物的正确命名为
2-乙基-3,3-二甲基-4-乙基戊烷
3,3-二甲基-4-乙基戊烷
3,3,4-三甲基已烷
2,3,3-三甲基已烷
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30分IwaseighteenyearsoldandIwasthegoldengirl.Iwaspresidentofthecollegedramasocietyamemberofthestudentsenateandsoon.Iwasthe1ofallmyfriendsandIwasinastateof2. TheoldGreektragedies3usthatwhenpriderisespunishmentfalls.Myuniverse4withgreatsuddenness.Thescenery舞台布景道具fellonmyheadandIwasleftalmost5forthenextfourmonths. Mymemorywasinamessandwithinafewmonthsallmy6weretakenaway.IwaseventoldthatIwouldhavetoleavethecollegeattheendofthespringterm7clearlyIcouldn'tdoacademicwork. SadItookonelast8byDr.JacobTaubes.HewasthemostbrilliantteacherIhadever9andinhisclassIbegantoraiseatentative10andaskanoccasionalquestion.HewouldanswerwithgreatintensityandsoonIfoundmyselfasking11questionsconstantly. OnedayIwaswalkingtothebuswhenIheardDr.Taubes12meMissHoustonletmewalkwithyou.Youknowyouhaveamost13mind. Me?Ihaveamind? Yesofcourse.Thenheaskedmyunderstandingofsomeproblemsdiscussedintheclasses. FromthatdayonDr.Taubescontinuedto14metothebusalways15mewithintellectuallyvigorousquestions.Withinseveralweeksmyeyesightcamebackandmyspirit16. WhatIacquiredfromthisexperiencewasa17senseoflife.Iremaindeeply18fortheattentionDr.Taubeshadshown.He19mewhenImostneededit.IsworethenthatIwouldtryto20andacknowledgetheunluckypersonasIhadbeenacknowledged. 1A.star B.envy C.center D.hero 2A.danger B.mess C.pride D.panic 3A.inform B.warn C.guarantee D.explain 4A.cutoff B.turneddown C.gotthough D.brokedown 5A.blind B.deaf C.dumb D.hurt 6A.offices B.memories C.senses D.emotions 7A.until B.after C.when D.since 8A.exam B.chance C.lecture D.course 9A.attached B.contributed C.experienced D.longed 10A.head B.hand C.arm D.voice 11A.extra B.fewer C.additional D.more 12A.addressing B.reminding C.asking D.shouting 13A.complex B.considerate C.interesting D.disappointed 14A.walk B.follow C.lead D.invite 15A.treating B.challenging C.entertaining D.accompanying 16A.sank B.developed C.bloomed D.inspired 17A.tragic B.comic C.opposite D.magic 18A.encouraged B.grateful C.satisfied D.guilty 19A.admits B.permits C.respects D.acknowledges 20A.send B.reserve C.reach D.sacrifice
VisitorsstillstopattheoldhouseinScituateMassachusetts.Butthehouseisnotwhatbringsthemthere.Whattheywanttoseeistheoldstonewellbesideit﹣andtheiron﹣boundwaterbucketthat'sputonitsedge. TwohundredyearsagothisfarmhousewasthehomeofSamuelWoodworth.DuringthelongsummersofhischildhoodyoungSamuelwouldoftenpauseatthewell.Itwasawelcomebreakespeciallyonahotafternoon.Onsuchadayhewouldeagerlydrawabucketfulofcoldwaterandsatisfyhisthirstwitharefreshingdrink. WhenhewasfourteenWoodworthleftScituateforNewYorkCitywherehestartedhisownnewspaper.Laterheworkedasaneditoratothernewspapersandmagazineswhilewritingnovelsplaysandpoetryinhissparetime.Hislifewasbusyandherarelyhadtimetovisitthefamilyfarm. ButWoodworthneverstoppedthinkingofhisScituatehome.AfterworkoneeveningWoodworthpouredhimselfaglassofcitywater.AfterthatheremarkedtohiswifeLydiahowwonderfulitwouldbetohavealongcooldrinkfromtheoakenbucketathisfather'swell.LydiahadasuggestionWhynotputittopoetry? ItwasasuggestionWoodworthcouldnotresist.ThatnighthewroteTheBucket.Inithecapturedtheworldofhischildhoodonahotsummerdayandthesimplejoyofstoppingforadrinkathisfather'swell. Hispoemwasaninstantsuccess.Itseemedtotoucheveryonewhohadeverbeenhomesick.AttheheightofitspopularityTheOldOakenBucketasitcametobecalledwastranslatedintofourlanguagesandthewordsweresettoapopulartuneofthetime.OvertheyearscountlesspeoplehavereadorsungWoodworth'sodetohisboyhood.TodayitistheofficialsongofScituateMassachusetts. 1Whydoestheauthoruseflashback倒叙inParagraph2? A.Tohelpreadersappreciatethewellwater. B.Tohelpreadersenjoycitylife. C.TohelpreadersunderstandhowhardWoodworthwas. D.TohelpreaderslearnaboutWoodworth'schildhoodlife. 2WhatwasWoodworth'spurposeforwritingthepoem? A.Tosharehisopinion. B.Tointroducehishometown. C.Toexpresshisemotion. D.Tomakesomecomplaints. 3Whatcanweinferfromthetext? A.Thewaterinthewelltastedbetterthanthatinthecity. B.ThewellandthewaterhadadeepimpressiononSamuel'smind. C.Woodworth'swiferemindedhimofthewellandsuggestedputtingittopoetry. D.Notmanypeoplepaidmuchattentiontothepoematfirst. 4Whichofthefollowingcanbethebesttitleforthetext? A.TheOldOakenBucket B.LivinginNewYork C.GrowingupontheFarm D.GoodSuggestionsfromWife
8分ExpertssaythatiffoodwereacountryitwouldranksecondbehindtheUSasoneofthebiggestgreenhousegaspolluters.Thereasonistherisingdemandformeat.Animalfarmingisresponsiblefor14.5percentofglobalgreenhousegasmethane甲烷emissions排放.Whilecowsaretheworsecontributorspigssheepdonkeysandotheranimalsplayapartaswell. Animalagriculturealsocauseslandtobecomedamagedwatertobepollutedandforeststogetdestroyed.Withtheworldpopulationforecasttoriseto9.8billionby2050thingsareonlylookingworseforouralreadydecreasingnaturalresourcesWhilegoingvegetarian素食的wouldhelpmeatconsumptiontoodeep﹣rootedinmostwesterndietstoallowforsuchasharppermanentchange.Thatiswhyexpertsareadvocatingsubstitutingsomeofthebeefchickenorporkwithordinaryinsects! Insectswhichgrowintoadultswithinamatterofmonthsifnotweeksarereadyforconsumptionmuchfasterthandomestic驯养的animals.TheyalsorequiremuchlessroomuselesswaterandfoodandproducefarlessgreenhousegasthananimalsOftheI.Imillioninsectspeciesworldwidescientistshaveidentified1.700aseatable.Amongthemareantsgrasshoppersgrubsandearthworms.Justlikeanimalseachinsecthasadifferenttaste.TreewormstastejustlikeporkandgrubsaresimilartosmokedmeatWhileeatinginsectsmightbeanewconceptforWesternpeopleover2billionpeopleworldwideconsumeinsectsasaregularpartoftheirdiet.Besidesbeingdeliciousinsectsarehighinproteinhaveveryfewcaloriesandarefreeofthesaturated饱和atfoundinanimalmeatInsectscanbepreparedinmanyways.Creativecookscanusetemtocookprotein﹣richsoupmakebakedtreatsandevenfryafewwithvegetables.Soeatinsects﹣bothyourbodyandMotherEarthwillthankyouforit! 1Whichofthefollowinganimalsareresponsibleforthemostglobalmethaneemissions? A.Cows B.Pigs C.Sheep D.Donkeys 2Howisthethirdparagraphmainlydeveloped? A.Byaskingquestions B.Byprovidingexamples. C.Bylistingthenumbers D.Bymakingcomparisons. 3Whatdotreewormstastelike? A.Pigmeat B.Tomatosoup C.Freshvegetables. D.Friedchicken. 4Whatcanbeinferredfromthelastparagraph? A.Fewpeopleeatinsectsregularly. B.Ordinaryinsectsarehighinfat. C.Saturatedfatisharmfultohealth. D.Insectscontainvariousvitamins
原子核是由质子和中子组成的它们统称为.核电站是利用选填“重核裂变”“轻核聚变”或“化学反应”获得核能并将其转为电能.
用手握住较长软绳的一端连续上下抖动形成一列简谐横波.某一时刻的波形如图所示绳上ab两质点均处于波峰位置.则
甲乙两个弹簧振子它们的振动图象如图所示则可知两弹簧振子
Whyshouldmankindexplorespace?Whyshouldmoneytimeandeffortbespentexploringandresearchingsomethingwithsofewapparentbenefits?WhyshouldresourcesbespentonspaceratherthanonconditionsandpeopleonEarth?Thesearequestionsthatunderstandablyareveryoftenasked. Perhapsthebestanswerliesinourgeneticmakeupashumanbeings.Whatdroveourancestorstomovefromthetreesintotheplainsandonintoallpossibleareasandenvironments?Thewiderthespreadofaspeciesthebetteritschanceofsurvival.Perhapsthebestreasonforexploringspaceisthisgenetictendencytoexpandwhereverpossible. Nearlyeverysuccessfulcivilizationhasexploredbecausebydoingsoanydangersinsurroundingareascanbeidentifiedandpreparedfor.Withoutknowledgewemaybecompletelydestroyedbythedanger.Withknowledgewecanlessenitseffects. Explorationalsoallowsmineralsandotherpotentialresourcestobefound.Evenifwehavenoimmediateneedofthemtheywillperhapsbeusefullater.Resourcesmaybemorethanphysicalpossessions.Knowledgeortechniqueshavebeenacquiredthroughexploration.Thetechniquesmayhavemedicalapplicationswhichcanimprovethelengthorqualityofourlives.Wehavealreadybenefitedfromotherspin﹣offsincludingimprovementsinearthquakepredictioninsatellitesforweatherforecastingandincommunicationssystems.Evennon﹣stickpansandmirroredsunglassesareby﹣productsoftechnologicaldevelopmentsinthespaceindustry! Whilemanyresourcesarespentonwhatseemsasmallreturntheexplorationofspaceallowscreativebraveandintelligentmembersofourspeciestofocusonwhatmayservetosaveus.Whilespacemayholdmanywondersandexplanationsofhowtheuniversewasformedorhowitworksitalsoholdsdangers.Thedangerexistsbutknowledgecanhelphumanbeingstosurvive.Withouttheabilitytoreachoutacrossspacethechancetosaveourselvesmightnotexist. WhileEarthistheonlyplanetknowntosupportlifesurelytheadaptiveabilityofhumanswouldallowustoliveonotherplanets.Itistruethatthelifestylewouldbedifferentbuthumanlifeandcultureshaveadaptedinthepastandsurelycouldinthefuture. 1Whydoestheauthormentionthequestions? A.Toexpresshisdoubts. B.Tocomparedifferentideas. C.Tointroducepointsfordiscussion. D.TodescribetheconditionsonEarth. 2Whatisthereasonforexploringspacebasedon? A.Humansarenatureborntodoso. B.Humanshavethetendencytofight. C.Humansmayfindnewsourcesoffood. D.Humansdon'tliketostayinthesameplace. 3Theunderlinedwordspin﹣offsinParagraph4probablyrefersto. A.survivalchances B.unexpectedbenefits C.potentialresources D.physicalpossessions 4Whichofthestatementscanbestsumupthepassage? A.Spaceexplorationhascreatedmanywonders. B.Spaceexplorationprovidesthebestvalueformoney. C.Spaceexplorationcanbenefitscienceandtechnology. D.SpaceexplorationmayhelpusavoidpotentialproblemsonEarth.
JoiningUsasaGamesVolunteer! Thesuccessofthe2020TokyoOlympicGamesdependsonyourcontribution!JoinusasaGamesVolunteer! GamesvolunteerswillbedirectlyinvolvedinassistingGamesoperationsbefore.duringandaftertheTokyo2020GamesGamesvolunteerswillguideathletesaroundwelcomeimportantpeopleandhelplostvisitors NumberofVolunteeringDaysandDailyHours ※TheTokyoOlympicGameswillbeheldfromFriday24JulytoSunday9August2020.InprincipleGamesvolunteerswillberequiredtoworkforatleastafortnightbeforeduringandaftertheOlympicGames. ※Gamesvolunteerswillworkapproximatelyeighthoursperdayincludingrestbreaks.Actualshiftlengthsdependoneventschedulesactivitiesactivitysitesetc. AgeandResidentialRequirements Applicantsmustfulfillthefollowingtworequirements ※BornonorbeforeApril12002 ※JapanesenationalorpersonwithvalidvisapermittingresidenceinJapanduringthevolunteerperiodtemporaryvisitorsincluded.NativespeakersofEnglishwillbepreferred. NumberofGamesVolunteerOpportunities 80000 MethodandApplicantCategories ※Applicationswillbesubmittedonline ※Individualsonly OffersandConfirmation Thoseapplicantswhoattendthetrainingsessions会议andareassignedavolunteerrolewillbeofferedtobecomeaTokyo2020Gamesvolunteer. Pleasenotethattheaboveofferwillbecancelledintheeventofanyofthefollowing ※IfthevolunteerengagesinanyactivitythatdamagestheimageoftheTokyo2020Games ※Ifthevolunteerengagesinanyactivitythatseverelydamagesteamwork ※Ifanyinformationcontainedintheoriginalapplicationformisclearlyfoundtobefalse ItemsandWelfaresProvidedtoVolunteers VolunteerswillbeprovidedwithasetoffreeOlympicGamesvolunteeruniformsandmealsduringtheworkday. 1AGamesvolunteerwillberequiredtoworkforatleast. A.oneweek B.twoweeks C.threeweeks D.fourweeks 2WhowillbemorelikelytobeacceptedasaGamesvolunteer? A.AChinese B.ARussian C.AnAustralian D.AGerman 3WhatwillGamesvolunteersbeprovidedwithforfree? A.Accommodation. B.Clothing. C.Transportation. D.Amusements
15分LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaiditwas1wonderfulholidaydestination.Beforewewentwehadplannedformonths.Whenthedaycamewewereready. Sinceitwasthefirsttimewe2betherewewereprettyexcited.Afterourplanelandedwewenttothehotel.Wehadmade3wereservationsixmonths4earlybutthemanatthefrontdesksaidtherehadbeenamistake.We5tellthatourroomshadn'tbeenreservedforthatweek6fortheweekafter.Ididn'tunderstandwhythiswouldhappenandmycreditcardhadalreadybeenchargedforthereservation.What'sworsethehotelhadbeenfullybooked.Whenwe7wonderwhattodothemanagercameout.Shewas8surprisehelpful.SheapologizedforthemistakeandgaveusaspareVIProomonthetopfloor.Wehadneverstayedinsuchanamazingroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach9somepeoplewereplayingvolleyball.Wegotalittle10sunburnbutthedayhadbeensorelaxingthatwedidn'tmind.
磁体的磁感线是
10分请修改下面这篇短文.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∧并在其下面写出该加的词. 删除把多余的词用斜线\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11处起不计分. Goodmorningeveryone!NowI'dliketosharingmyviewinreading.Ithinkreadingisoneofthemorebeneficialandpracticalactivitiesthatamancando.Itisthroughreadingwhichapersonisabletodiscovernewideasplacesandpeople.EventhoughIhadaheavyloadofclassesIcanmanagetofindaboutfortiethminutesadaytoreadbooks.Iprefertoreadbeforesleepingorwhilewaitingabus.Asaresultyoucanwritemanygoodarticle.Icanalsotakepartinconversationwithotherseasy.Letsreadsomebookstogetherandtalkaboutthemanexttime! That'sall.Thankyou.
太阳是一颗自己能发光发热的气体星球它的能量来自于反应.行星在太阳的引力作用下几乎在同一平面内绕太阳公转距离太阳越近的行星公转周期大小越.
天然放射性元素衰变时放出的β射线是
在一只锥形瓶中放入一个气球把气球的开口翻在锥形瓶的瓶颈上如图所示然后向气球吹气将会发生的现象是已知在封闭瓶口时瓶内被封闭的气体体积V压强p0.若忽略气球薄膜产生的弹力认为气球内外压强相等同时忽略吹气时温度变化.在人吹出的气体压强达到1.1p0时气球的体积增加量为V.
8分WhenIwas5yearsoldIstartedlosingweight.MyparentsnoticedIwaspaleandalwaysthirsty.Theyhadmetestedtoseeifmybloodsugarwashighbecausetheythoughtthatmightbecausingmysymptoms. Mybloodsugarwasfivetimeshigherthannormal.Thatcanbedeadly.Myparentsrushedmetothehospital.That'swhenmywholelifechanged. ThedoctorssaidIhadType1Diabetes糖尿病.Thatmeansmybodycan'tmakeinsulin胰岛素.There'snocure. MyparentshadtogivemeinsulinshotseverydayandIhadtogetovermyfearofneedlesquickly.SometimesIhad10band﹣aidsonmyfingersatonce. NowthatI'molderIcheckmyownbloodsugarandgivemyselfshots.AboutfouryearsagomymomstartedtravelingtoruralGuatemala.Shegoestwiceayeartohelppeopleinneed. IhavebeenaGirlScoutsincekindergarten.ForaGirlScoutprojectIputtogetherateamtogotoGuatemalatotestpeopletherefordiabetes.WewentforfourdayslastJuly.Wetested378childrenand100adults.Wefoundthreeadultswithadifferentkindofdiabetescalledtype2.Wealsofoundonelittlegirlwithdangerouslylowbloodsugar.Shecriedwhenwetoldher.Shehadbeenfeelingdizzyanddidn'tknowwhy.ItwaslikereplayingwhathappenedtomewhenIwaslittle.Italkedthroughatranslatorbuteveryoneunderstoodhugs.IgavemorehugsthanI'veevergiven. Havingtype1diabetesishard.ButIhaveaccepteditreadily.Ithashelpedmemeetamazingpeople.Ithasmademeresponsibleandindependent.Ithasalsoshownmethepoweroftakingaction.I'mgoingbacktoGuatemalathissummertotestmorekids.IwanttohelpasmanykidsasIcan.Butmygreatestwishisforacure.Type1diabeteschangesyourlife.Ifnootherchildeverhastohaveitthatwouldbeamazing. 1Whydidtheauthor'sparentshaveherbloodsugartested? A.Theyfoundthatshewaspale. B.Theynoticedthatshewasthirsty. C.Theydoubtedifshewasill. D.Theywonderedifshewastired. 2Whatdoweknowabouttheauthor? A.HerTypeIDiabeteswascured. B.Shelostheartaftertheexamination C.Shesufferedalotfromthedisease. D.Sherefusedinsulinshotsforfearofpain 3WhydidtheauthorgotoGuatemala? A.Hermotherrequestedherto. B.Shehopedtohelppeoplethere. C.HerGirlScoutleadermadeamedicalteam. D.Shewantedtostartherround﹣the﹣worldtrip. 4Whatisthemainideaofthepassage? A.SheliveswithTypeIDiabetes. B.ShehaswonderfulexperiencesinGuatemala. C.Unexpectedtripmakeshermoreconfident. D.Shelivesamazinglydespitethediabetes.
如图所示一足够长的固定斜面的倾角为θ=37°质量m=1kg的物体受到平行于斜面的力F作用由静止开始运动.力F随时间t变化规律如右图所示以平行于斜面向上为正方向g=10m/s2sin37°=0.6cos37°=0.8物体与斜面间的滑动摩擦因数为0.25求 1第1s内物体运动的加速度大小a1 2第2s内物体运动的加速度大小a2 3第1s末物体的动能的大小EK1 4请描述物体在第4s内的受力情况或画出受力分析图并说明理由.
8分Sharpshootersrefertothosewhoareskilledatfiringagunandaccuratelyhittingwhattheyareaimingat.Howeversomefisharealsocalledamazingsharpshooters.Peoplewonderhowtheyhittheirtargetswithoutusingtools?Byspitting!Thefishshootsoaccuratelythattheyrarelymisstheirtarget. Theseamazingfisharearcherfish印度射水鱼.ThereareseveraldifferenttypesofarcherfishlivinginSoutheastAsia.Theyspitattheirdinnertocatchit.Tocatchdinnerafishfirstsetsitselfinacertainplaceforexamplejustbelowthesurfaceofthewater.Itputsthetipofitsmouthsoitbarelybreaksthroughthewater.Thenthefishwaitsforanunsuspectinginsecttolandonaleaforbranchhangingoverthewater. Whenanunsuspectingorunknowinginsectlandsthefishattacks.Thefishsqueezesitsgill腮coversveryrapidlywhichforceswaterintothefish'smouth.Intheroofofitsmouththefishhasagroove槽.Thefishformsthesmallgrooveanditstongueintoanarrowtubebypressingitstongueupagainstitsgroove.Thewaterforcedintothefish'smouthisforcefullypushedoutofthefish'smoulhthroughthetube.Archerfishhavebeenknowntosendastreamupto5meters16feet.Howeverarcherfishcanonlyshootinsectsupto1﹣2meters3﹣6feetawayduetotheirlimitedaccuracy. Whentheunsuspectinginsectishitwithasuddenstreamofwateritisknockedintoorfallsintothewater.Onceinthewatertheinsectbecomesdinner.Archerfishlearnhowtospitwhentheyareyoung.Theygetmoreaccuratewithpractice.Adultarcherfishrarelymiss. Withinameterarcherfishwilloftenspringoutofthewaterandgrabaninsectintheirmouths. 1Paragraph1flinctionsasan. A.background. B.comment. C.explanation. D.introduction. 2Whichofthefollowingistherightstepsofarcherfish'shuntingforaninsect? a.Ithasitstonguepressedagainsttheroofofitsmouth. b.Itgatherswaterintoitsmouthbysqueezingitsgillcoversquickly. c.Itshootsastreamofwaterattheinsectabovewater. d.Itstaysunderwaterforaninsecttolandnearby. A.adcb B.dbac C.dbca D.adbc 3Ifaninsectis3feetawayanarcherfishwilloftentocatchit. A.jumpoutofthewater B.spitakindofoilyliquid C.shootastreamofwateratit D.pushitstongueoutofitsmouth 4Archerfishcan'thitinsects5metersawayforthereasonthat. A.theireyesightislimited B.theycan'thitfarawayinsectsprecisely C.theirmouthsareunderthesurfaceofwater D.thelongestdistancetheycanhitisatmost5meters
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