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如图，上、下都与大气相通的直立圆筒竖直放置，中间用横截面积S＝0.01m2、质量不计的两个活塞A、B封闭着一定质量的理想气体，活塞B与一劲度系数k＝1000N/m的弹簧相连，平衡时两活塞相距l0＝0...
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高三下学期物理《》真题及答案
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如图2所示用一细绳将横截面积为S的气缸开口向下竖直悬挂.金属圆板活塞A的质量为M上表面水平下表面倾斜
如图所示一个上下都与大气相通的直圆筒内部横截面积为S=0.01m2中间用两个活塞A.和B.封住一定质
如图所示一个上下都与大气相通的直圆筒内部横截面积为S=0.01m2中间用两个活塞A.和B.封住一定质
如图A-5所示一个横截面积为S的圆筒形容器竖直放置金属圆板A的上表面是水平的下表面是倾斜的下表面与水
一端封闭的圆筒由两个截面积相同的活塞A和B隔成两部分空间各封闭着一定量的气体活塞A和B跟圆筒紧密接触
如图所示一个水平放置的固定直圆筒左右都与大气相通内部横截面积为S＝0.0lm2．中间用两个活塞A和B
如下图所示一个上下都与大气相通的直圆筒内部横截面的面积S.=0.01m2中间用两个活塞A.与B.封住
如图所示一个横截面积为S的圆筒形容器竖直放置金属圆板A的上表面是水平的下表面是倾斜的下表面与水平面的
如下图所示一个上下都与大气相通的直圆筒内部横截面的面积S.=0.01m2中间用两个活塞A.与B.封住
如图一固定的竖直气缸由一大一小两个同轴圆筒组成两圆筒中各有一个活塞已知大活塞的质量为m1=2.50k
如图所示一个上下都与大气相通的直圆筒内部横截面的面积S.＝0.01m2中间用两个活塞A.与B.封住一
如图所示一个上下都与大气相通的直圆筒内部横截面的面积0.01m2中间用A与B两活塞封闭一定质量理想气
一定质量的理想气体被活塞封闭在圆筒形的金属气缸内如题102图所示活塞的质量为m=30Kg横截面积为S
如图在大气中有一水平放置的固定圆筒它由ab和c三个粗细不同的部分连接而成各部分的横截面积分别为2S.
如图所示一个水平放置的固定直圆筒左右都与大气相通内部横截面积为S＝0.0lm2．中间用两个活塞A和
如图上端开口的竖直气缸由大小两个同轴圆筒组成两圆筒中各有一个活塞两活塞用刚性轻杆连接两活塞间充有氧气
如图所示一个横截面积为S.的圆筒形容器竖直放置金属圆板
的上表面是水平的，下表面是倾斜的，下表面与水平面的夹角为θ，圆板的质量为M.。不计圆板与容器内壁之间的摩擦.若大气压强为p
0
，则被圆板封闭在容器中的气体的压强p等于
A.
如图所示一个上下都与大气相通的导热直圆筒中间用两个活塞A与B封住一定质量的理想气体AB都可沿圆筒无摩
一个上下都与大气相通的直圆筒内部横截面积为S=0.01m2中间用两个活塞A.和B.封住一定质量的气体
如图在大气中有一水平放置的固定圆筒它由ab和c三个粗细不同的部分连接而成各部分的横截面积分别为2SS
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为研究低温对某种热带植物叶绿体结构和代谢的影响科研人员选用长势一致的两个品种的幼苗分别在28℃和0℃条件下处理一段时间后测定幼苗叶片离体叶绿体的放氧量和叶绿体中MDA含量MDA是膜脂质分子过氧化产物其含量反映叶绿体膜的受损程度结果如图．请回答 1测定离体叶绿体放氧量实验中需要控制的无关变量有至少两项． 2离体叶绿体中放氧的场所是与氧气同时产生的物质将进入直接参与过程． 3根据实验结果分析叶绿体中MDA含量与膜受损程度呈填“正”或“负”相关．低温胁迫引起放氧量下降的原因是使叶绿体中色素含量． 4本研究表明两个品种中较耐低温的是．
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处错误每句中最多有两处每处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:在错的词下面画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. Idon'tknowwhattoexpressmysincereapologytoJimbecauseIlostthebookhelentittome.Iwasverygratefulwhenheputabookonmydesk.InordertogiveitbacktohersoonIspentthreedaysreadit.ThenextdayItookthebooktoJim'sclassroomtoreturnit.LuckilyIcouldn'tfinditanywherewhenIarrivedathisclassroom.TherewasobviousthatIcouldn'tgiveitbacktohimasIpromisedbefore.WhatshouldIdonow?Idecidetobuyanewonetohimandwritealetterofapologytohim.ThelessonformeisthatIshouldtakegoodcareofwhatbelongtome.
Doyouwantyourparentstobeproudofyou?Doyouwantthemtotrustyouthemostandbelievethattheycancountonyou?Doyouwanttobetherolemodelofgoodbehavior?Beingresponsibleistheanswer.Thenhowtoberesponsible? 1. Parentslovetoseecleanroomsorganizedclosetsandfloorsthatdon'thavepilesofthingsonthem.Doalittlebitofcleaningeachdaysoitisneveroverwhelming. Trysettingasideatimetodofiveminutesofcleaningsuchasaftersuppereachevening. Dresswellandtakegoodcareofyourbody. Findyourownpersonalstyle:cutepreppygirlyboyishseriousorwhimsical.Whateveryourstyleyourclothesshouldbeneat.Brushyourhairandteethstaycleanand2.Thiswillhelpyoulookandfeellikeanangelchild. Stayontopofyourresponsibilities. Doyourhomeworkassoonasyoucomehomewhichwillpleaseyourparentsandgiveyoutherestofthedayfree.Puteffortintoyourschoolworkandgetthebestgradesyoucan. Ifyouneedhelpaskforit!Thiswon'tbotheryourparents﹣3 Getplentyofsleepeatwellandspendtimeoutdoors.Thisshowsyourparentsthattheytaughtyouwell. Acknowledgeyourmistakes. Blamingotherpeopleisimmatureandparentscanusuallytellwhenyou'redoingit.InsteadgotoyourparentsandsayItwasmyfaultandIamsorry.Evenifthey'reunhappyaboutyourmistake4Butdon'tbackanswertheycansurelygetangryandwouldalwayspointoutyourmistakesthenexttime.Socontrolyourselfandstaycalmeveninthetimeofworstsituations. Keepyourpromises. Ifyouofferedtohelpdowhatyousaidyou'ddo.5andthey'lltrustyouwhenitcomestotheimportantthings.Ifyouaren'tsurewhetheryoucandosomethingdon'tpromisetodoit.InsteadsayIthinkIcanorI'lltry. A.Dowhattheyaskyoutodowithouttalkingback. B.Eatfruitsandvegetable. C.Yourparentswilllovetoseeyoubeingkind. D.Itshowsthemthatyoucare. E.Theywillbeproudofyouforowninguptoit. F.Parentsappreciatereliability. G.Stayneatandorganized
把下列数据用科学记数法表示出来全世界人口约为61亿
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科研人员利用图1所示固定化乳糖酶反应装置降解牛奶中的乳糖并研究了乳糖酶凝胶珠颗粒大小对降解效果的影响．实验时将3种不同大小的凝胶珠分别放在反应柱中打开活栓然后以相同的速度向每个反应柱中加入等量的牛奶测定收集的牛奶中葡萄糖的浓度结果如图2．请回答 1乳糖酶催化乳糖降解为葡萄糖和． 2制备固定化乳糖酶凝胶珠时溶解海藻酸钠宜采用的方法．应用溶液浸泡凝胶珠使其形成稳定结构． 3与固定化细胞相比固定化酶时使用的海藻酸钠浓度应适当这样可以减少． 4本实验结果表明直径为mm的乳糖酶凝胶珠降解乳糖的效果较好分析其原因是． 5在凝胶珠颗粒直径一定时控制牛奶流经反应柱的速度测定不同流速下收集的牛奶中葡萄糖浓度．请在相应位置的坐标中绘制收集的牛奶中葡萄糖浓度相对值与流速之间的关系曲线．
阅读下面短文根据所给情节进行续写使之构成一个完整的故事. Iwasdoingabigclean﹣uprecentlyandmykidswerehelpingwhenmysonFreddocameacrossaknottedhandkerchiefwithanolddarkbrowncoininside.MumcanIhavethis?CanIplaywiththiscoinheasked.Itookonelookandwasimmediatelytransportedtoanothertime. In1991therewasatimewhenmyfriendandIworkedinabackwardAfricancountryNigerhitbysandstormsandburningheat.ThereweremanythingsIfounddifficultaboutthisplace﹣﹣theclimateandbeggarsweremybiggestheadaches.SoafterfinishingfivemonthsofnursingworktherewemovedontoworkatahealthclinicinneighbouringcountryBurkinaFaso.It'smuchgreenerinBurkina.EventheCoketastesbetterthelocalsassuredus. Yetthefactwasquitetheopposite.ArrivingbytaxiatourdestinationinBurkinawebegantounload.Iwasreachingformylargerpieceofluggagewhenoutofthedarknessamotorbikewithtwomenapproachedslowly.Withoutwarningoneofthemengrabbedmydaypackasthemotorbikesweptcloseby.Withinsecondsthepairwereoutofsightswallowedupbythenight. Withmypassportmoneytraveller'schequesallinthebagIwasindeeptrouble.Howfrustrating!AllIwantedwastoleavethishellhole!ThenwalkingthroughBurkina'sstreetsonedayIwasstoppedbyanoldwomanwhothrustherhandinmyface.Cadeau'gift'inFrench!Cadeau!shecried.I'dhadenough!Iwasextremelytiredofthecountry:itspovertyitsthievestheheatthedustand…everything!ItoldherangrilyandfirmlyinFrenchIhaveno'Cadeau'.Ihavenomoney.AthiefstoleallmymoneytwoweeksagoandnowIcan'tgetoutofyourcountry.Icannotgiveyouanything.NOTHING!'Thebeggarwomanlistenedattentively.Tomygreatsurpriseafterhearingmywordsshegaveabroadsmile. 注意:1.所续写的短文的词数应为150词左右; 2.应使用5个以上短文中标有下划线的关键词语; 3.续写部分分为两段每段的开头语已为你写好; 4.续写完成后请用下划线标出你所使用的关键词语. Shereachedintothepocketofherdress. Therewasaslighttouchonmyhand;lookingdownIsawmysonlookingatmecurious.
Whatcouldhomesofthefuturebelike?Nooneknowsexactly.Butpreparationsaremadefortheworld'sfirstfreeform3D﹣printedhouse. ExpertswillbuildahousecalledCurveAppealwhichwillbe3D﹣printedoff﹣sitebeforebeingputtogetheron﹣sitetocreatetwooutsidewallsaroofandaninsidepart.Thesefourmainpartswillthenbejoinedtogether. Although3D﹣printedbuildingshavebeenmadebeforethishome﹣﹣﹣tobebuiltinChattanoogaTennesseelaterthisyear﹣﹣﹣willbethefirstofitskindasitwillcontainnoregularshapesorangles.ThehouseisthecreationofthedesigncompanyWATGbasedinLondonandCalifornia.ThedesignforCurveAppealdrawsinspirationfromtheCaseStudyHouseprogram. Thearchitects建筑师leadingtheprogramwerefamousfortryingtocreateopen﹣planspacethataddsnaturallight.InawrittenstatementaspokesmanforWATGsaidUsingmanyofthesamemoderndesignprinciplesCurveAppealisthenextdevelopingstep.It'simportantthatthebuildingsandtheenvironmentworktogetherharmoniously.ThechosensiteforCurveAppealisstepsawayfromtheTennesseeRiverinabeautifulwoodedsunlitarea. WATGwasawardedthefirstprizeintheFreeformHouseDesignChallengein2016andgivenprizemoneyof﹩8000tomakeitsplansareality.Thecompetitionwasdesignedforarchitectsdesignersengineersandartists. Competitorswerechallengedtodesigna600to800﹣﹩qftsingle﹣familyhomethatrethinkstraditionalaesthetics美学constructionbuildingsystemsandstructure. OverthelastyearWATG'sChicagoofficehasbeendevelopingtheirdesignwithBranchTechnology.Thisprojectwillbecompletedlaterthisyear.OncecompletedtheCurveAppealhomewillhaveopenandlight﹣filledinsidelivingspace. 1WhatcanweknowaboutCurveAppealfromthepassage? A.Itwillbedifferentfromanordinaryhouse. B.Itisthefirst3D﹣printedbuilding. C.Ithasvisiblewallsbutnoroof. D.Itwaseverbuiltintheworld. 2Whereisthefreeform3D﹣printedhouselocatedaccordingtoParagraph4? A.FarawayfromtheTennesseeRiver. B.InthewoodsneartheTennesseeRiver. C.NearWATG'sChicagooffice. D.Nexttosomemodernbuildings. 3WhatdoestheFreeformHouseDesignChallengedo? A.Itinspirespeopletodesignwhattheylike. B.Itonlyacceptsdesignsintraditionalways. C.Itofferscompetitorsinspirationwhennecessary. D.Ithelpsputcreativeideasintopractice. 4What'sthepassagemainlyabout? A.Thedesignofhomesinfuture. B.TheFreeformHouseDesignChallenge. C.Theworld'sfirstfreeform3D﹣printedhouse. D.Thedevelopmentof3D'sprintinginarchitecture.
Twoladieslivinginoppositeapartmentssayhellowhentheymeeteachotherinthecorridor.OneofthemsaysImovedherefiveyearsago1Inevermetyoubefore.CouldIaskyournameplease?TheothersaysI2behereforsixyears.HowshouldIcallyou? Itseemsveryridiculous3peoplelivingsoneardon'tknoweachotherforsuchalongtime.HoweverYoucanfindthiskindofstory4performeverywhere.Itistheexact5reflectofinterpersonalrelationshipsinthemodernworld.Inthemodernworldmostpeopleliveinapartments.Theyclosetheirdoorsandnevergooutassoonastheygethomefromwork.Iftheylivealonetheywillkilltheir6watchingTVorreadingmagazines.Theydon'thaveanyconnectionsevenwiththeir7closeneighborswhoseemnodifferentfrompeopletheymeeteverydayin8street. Thisphenomenonisnogoodtousnortooursociety.Peoplewillfeelmoreandmorelonely.Theworldbecomessoindifferent.It'stimethatwe9takesomemeasurestoimproveit.Peoplelivinginthesameplacecan10organizetohavesomeactivities.Weshouldcallonpeopletobefriendlytoeachother.
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BooksforKids ●LesserSpottedAnimalsbyMartinBrown ImageSource:Scholastic Haveyoueverheardofanumbat食蚁兽ordzorilla非洲艾鼬?Noneitherhadwe.Thankstothisunusualpicturebookbothyouandyourlittleanimalloverscanlearnaboutawholegroupofnewcreatures.Beware:Youmaystartaskingforforeignpetsafterturningthesepages. AvailablefromAmazon＄14.47 ●HowtoAvoidExtinctionbyPaulPaulAcampora ImageSource:Scholastic YourmiddleschoolerwillcertainlyenjoyjumpingintoanoldBuickalongwithLeohis16﹣year﹣oldcousinandalovelydognamedKermitonacross﹣countryroadtrip.Thisfuncomedicbookfilledwithfoodfamilyandfossilswillteachkidsaboutlifeinawaytheycangrasp.Ifyou'relookingforagoodreadforyourkidsthisisit. AvailablefromAmazon＄8.95 ●What'sOutThere?byLynnWilson ImageSource:PenguinRandomHouse DoyouhaveaCuriousAstronaut﹣wannabeonyourhands?ThisclassicReadingRailroadbookwillteachyourchildwhatthesunismadeofwhatcausesthemoontochangeshapeandallabouttheplanetsinjustafewpages.Thisbookissimplyoutofthisworld. AvailablefromAmazon＄3.99 ●ScienceStunts:Fun.FeatsofPhysicsbyJordanD.Brown ImageSource:PenguinRandomHouse Doesyourlittlescientistalsolovemagic?We'vefoundtheperfectbookforthem!They'llbeshockedbythewaythesesimplemagictrickscancometogetherwiththehelpofabitofscience.Thisisonebookthatwillhaveyousmilingfromeartoear. AvailablefromAmazon＄12.59 1Peterwhoisananimalfanmaylikeread. A.LesserSpottedAnimals B.HowtoAvoidExtinction C.What'sOutThere? D.ScienceStunts:Fun.FeatsofPhysics 2WhatcanchildrenlearnfromthebookWhat'sOutThere? A.Funofscience. B.Extinctionofspecies. C.Knowledgeoftheuniverse. D.Experienceofaforeigntour. 3Whichbookmaymakechildrenburstintolaughter? A.What'sOutThere? B.LesserSpottedAnimals C.HowtoAvoidExtinction D.ScienceStunts:Fun.FeatsofPhysics
LONDON﹣BritainpreparesforavoteThursdaythatwilldecidewhetheritleavestheEuropeanUnion.Thedebatehascenteredonimmigrationandeconomicsecurity.Bothsideshaveloweredthetoneoftheirargumentsafterathree﹣daysuspension暂停ofcampaigningthatfollowedthemurderofananti﹣Brexitlawmakeranincidentthatpolls民意调查suggesthasshockedmanypreviouslyundecidedvoterswhonowsaytheywillvotetoremain. TheseareuncertaintimesinanationwhoseeconomyisthesecondlargestintheEuropeanUnion.Therisksarehuge.Therearewarningsthatleavingthe28﹣membergroupmaycausetheBritishpoundtolose15percentofitsvalueandbringtheresignation辞职ofDavidCameronthecountry'sprimeminister;hisstayornotdependsonwhetherBritainlistenstohimandvotestoremain. FormonthstheLeavecampaignhasbeenhittingthestreets.Itsargumentsarebasedlargelyon immigrationandthebeliefthatBritainhashandedcontrolofitsborders边界toaEuropeansuperstate:TheU.K.haslostcontrolovermigration.WehavetoacceptanyoneintothiscountryiftheyhaveanEUpassportnomatteriftheyhaveacriminalrecordornot.Wearenotallowedtosay'no'topeopleandthatisdamagingforthesecurityoftheU.K.butitisalsoputtingpressureonjobsandopportunitiesforyoungpeoplesaidTomHarwoodaBrexitcampaigner. ThemurderofJoCoxananti﹣Brexitpro﹣immigrantlawmakerbyafarrightextremist极端分子withahistoryofmentalproblemshadaseriouseffectonbothcampaignsandonvoters. PollssincetheJune16thmurdershowedtheLeavecamplosinggroundbutwithbothsidesstillverycloseonareferendum全民投票thatmanybelievecouldchangethecourseofEuropeanhistory. 1WhatdoestheunderlinedwordBrexitinparagraph3mean?. A.BreakthelawoftheEuropeanUnion. B.BreakawayfromtheEuropeanUnion. C.BuildtheexittotheEuropeanUnion. D.BantheimmigrationintoBritain. 2Whatisimpliedfromthepassage? A.TheimmigrationhascausedgreatconcerninBritain. B.BrexitwillbegoodforBritisheconomy. C.Bothcampshavebeencampaigninganddebatingonthestreetsformonths. D.ThemurderofJoCoxmademanyvotersdeterminedtovotefortheexit. 3Whichofthefollowingstatementistrue? A.BritainwillleavetheEuropeanUnionafterthevote. B.AnyonewithapassportcanchoosetostayandworkinBritain. C.WhetherCameronwillresigndependsontheresultofthereferendum. D.JoCoxwasmurderedbyaBrexitcampaignerinJune16m. 4What'stheattitudeofthereporttotheeventofBrexit? A.Positive B.Negative C.Indifferent漠不关心的 D.Concerned
下列关于人体神经递质的叙述正确的是
Myfirstlessonwasatameeting.AswesettledaroundthetableIheardMegwhowas1arecentoperationtalkingtoJudiththemanagerofourprojectThankyousomuchfor2mydaughterstotheirdancelessonlastweek.Don'tmentionitJudithsaidItwasnothing. Knowinghow3JudithwaswithherworkkidsandagingparentsIfoundherdrivingMeg'schildrentodancelessonsunbelievably4. IwasabouttosaymoreaboutthiswhenDonnaanothercolleagueenteredtheroom5. Sheapologizedforbeinglatesayingshejusthadhostedalunchforherfriendswhowereoverseventy.ThatwassoniceofyouIsaid6howshedidn'tliketocookorclean.Ohshesaidwavingher7Itwasnothing.SomehowIcouldstilltellthe8inhervoice.Shegainedasenseofsatisfactionfromtheentertainment款待offeredtoherfriends. Seeingtheir9tohelpothersselflesslyIstartedthinkingabouttheconceptofnothingthispeacefulandgenerouswayofliving﹣﹣﹣wasitreallynothingorweretheysimplysayingthat?Isuddenly10thatonceIspentawholeafternoonafterworkhelpingafriend11aspeechshewasgoingtodeliver.I12hertorearrange重新安排theorderofthestoriesinthelecturetomakeitsoundmore13.Afterthefifthtryshefinally14it.Shehuggedmewith15sayingthankstome.Ismiledandsaiditwasnothing. SuddenlyIrealizedthathelpingsomeonewasreallysomethingtome.Ilearntthatgivingfromtheheartdoesn't16meanhardwork.The17isfindingsomethingwelovetodoandfindingsomeonewho18thatsomething.Ourgenerositycan19othersaswellasourselves.Onceyouhaveagood20ofitit'snothing.Andit'sreallysomething. 1A.recoveringfrom B.adaptingto C.goingthrough D.joiningin 2A.guiding B.fetching C.driving D.dragging 3A.common B.busy C.strange D.practical 4A.frightened B.sincere C.gifted D.generous 5A.hurriedly B.disappointedly C.angrily D.unexpectedly 6A.ignoring B.knowing C.forgetting D.predicting 7A.eyes B.feet C.leg D.hand 8A.pleasure B.sadness C.surprise D.regret 9A.progress B.adventure C.promise D.willingness 10A.referred B.refused C.remembered D.respected 11A.preparefor B.putup C.giveaway D.takeapart 12A.begged B.invited C.advised D.permitted 13A.unbelievable B.reasonable C.sensitive D.puzzling 14A.got B.meant C.caught D.made 15A.concern B.worry C.gratitude D.apology 16A.normally B.accidentally C.necessarily D.possibly 17A.treat B.trick C.belief D.plan 18A.needs B.admires C.loves D.defends 19A.defeat B.benefit C.win D.regard 20A.order B.balance C.impression D.command
杜氏肌营养不良症一般在3～5岁时开始发病20～30岁因呼吸衰竭而死亡受一对等位基因Dd控制．亨廷顿舞蹈症一般在中年发病受另一对等位基因Hh控制．如图是某家族两种遗传病系谱图其中Ⅰ3不携带致病基因．请回答 1利用DNA分子杂交技术鉴定Ⅰ3是否携带致病基因的原理是． 2该家族中杜氏肌营养不良症和亨廷顿舞蹈症的遗传方式分别是． 3Ⅰ4的基因型是．Ⅱ3产生同时含有两种致病基因卵细胞的概率是． 4Ⅲ3患杜氏肌营养不良症的概率是． 5若Ⅲ2与一正常男性婚配生一男孩该男孩正常的概率是．
利用科学记数法表示的数原来各是什么数-5.002×104＝
Fishingisapopularactivityandeveryfishermanknowstherule:Keepthebigonesthrowthesmalleronesback.Theideabehinditissimple﹣thelargerfishareprobablyolder.Ifyoukeepthesmalleronestheywon'tbeabletoreproduceandthefishpopulationwillbeindanger. Butfishingoutthelargestfishfromapopulationhasanunwantedeffect:Overtimefeweradultfishgetreallybig.Ifonlythesmallerfishreproducethenfuturegenerationswillbecomesmaller.Thisisanexampleofevolution进化inaction. OnescientistDr.DavidConoverhasspentthelastdecadestudyingtheeffectsofthekeepthebigonesruleandiftheycanbechanged. TosetuphisexperimentConoverandhisteamcaughthundredsofsilversidefishanddividedthemintosixgroups.FortwogroupsConoverfollowedtheukeepthelargeonesruleandtookoutthebiggestfish.Fortwoothergroupsheremovedonlythesmallfish.Forthelasttwogroupsheremovedfishatrandom随意的. Afterfiveyearshemeasuredthefishineachgroup.Inthetwogroupswherethelargestfishwereregularlyremovedtheaveragefishsizewassmallerthantheaveragesizeintheothergroups.Herewastheevolutioninaction:Ifonlysmallfishsurvivetoreproducethenfuturegenerationsoffishwillalsotendtobesmall. ForthesecondfiveyearsofhisexperimentConoverchangedtherulesandtookfishrandomlyfromeachgroup.Attheendoftheexperimenthefoundthatthefishthatwereinthekeepthelargeonesgroupforthefirstfiveyearshadstartedtogetlargeragainalthoughhecalculateditwouldtakeatleast12yearsforthefishinthatgrouptoreturntotheiroriginalsize. Inotherwordsittakeslesstimetoshrinkthanitdoestorecover. 1What'sthetraditionalruleinfishing? A.Keepbothbigandsmallones. B.Keepbigonesandfreesmallones. C.Keepsmallonesandthrowbigonesback. D.Keeptheonesthatcanreproduce. 2DavidConoverdidexperimentonfishinginorderto. A.findpracticalrulesinfishing B.provethetraditionalfishingrulewasreasonable C.seekforgoodfishestoreproduce D.findgoodmethodinraisingsilversidefish 3WhatdidDavidConoversexperimentprove? A.Fishermanshouldfishatcertaintime. B.Fishermanshouldkeepbigonesandfreesmallone. C.Fishermanshouldkeepsmallonesandthrowbigonesback. D.Fishermanshouldkeepfishatrandom. 4Whatdoestheunderlinedwordshrinkmeaninthelastparagraph? A.Becomesmaller. B.Becomeill. C.Becomeweaker. D.Becomeless.
ThefirstMondayinSeptemberisLaborDayintheUnitedStates.Thenationalholidaybeganmorethan100yearsago1honorlow﹣paidfactoryworkers. LaborDayalso2informalmarkstheendofsummer.ManystudentsreturntoschoolafterLaborDay.Thehotdaysofsummerturn3cool.ManyAmericanscelebratetheholiday4anoutdoorfamilybarbecue. ButLaborDaystartedwithastruggle.OnMay1st1889workersdemonstrated游行onthestreetsofParisFrance.InternationalLaborDaywasborn.Mostindustrialized5countryintheworld﹣excepttheUnited StatesandCanada﹣﹣celebrateLaborDayonthefirstofMay. ThefirstAmericanLaborDaycelebration6holdonSeptember5th1882inNewYorkCity.About10000workersmarchedthroughthestreetstoshowthe7strongoflabororganizations. FormanyyearsafterthatAmericanworkersusedthefirstMondayinSeptembertodemandbetterworkingconditionsandpay.Musicwasapartofmanyofthosemarchesandmanylaborsongstraditionallytellstoriesofconflictandhopesfor8betterlife.HereareWeShallNotBeMoved.WhichSideAreYouOn?BreadandRoses. EventhoughLaborDaydemonstrationsarenot9commonastheyareintheU.S.thesongremindsustocelebratetheeffortandlovethatmanypeoplegiveto10theywork.
Youmayfinditexcitingtogetapart﹣timejobduringthesummervacation.1Whenyougetaninvitationtoajobinterviewyouarehalfwaytowardsyourgoal﹣﹣ajoboffer.Hereareafewthingsyoushoulddoafterwards. Respondtotheinvitationtotheinterview.Thankthesenderfortheirtimeandfortheopportunitytoorganizetheinterviewconfirmingthatyouwillbeavailableatthedeterminedtime.2. 3Youneedtodosomeresearchonthecompanyandlearnasmuchaboutthecompanyaspossiblebeforetheinterview.Usethecompany'swebsiteandnewspaperarticlestogatherasmuchinformationaspossible.Youshouldalsobereadytotalkindepthaboutthecompanyandthepositionyouareapplyingfor. 4It'sbesttoprepareforawidevarietyofquestionsbythinkingaboutyourowncareergoalsandsoon.Wheredoyouseeyourselfinfiveyears?isacommonquestion.Workingdiligentlyforyouofcourse!Butunlessyouareactuallytryingtogetajobinyourchosencareerthisprobablyisn'tagoodanswer. Practicewithafriend.5Notonlywillthisgiveyouawaytostructureyourpreparationbutitwillalsohelpyougetcomfortablewithgivinganswers.Practicegivingconcisecompleteanswersandmaintainingeyecontactwiththeinterviewerswhileyougivethem. A.Askpeoplearoundyouforhelp. B.Ifyouhaveafriendwhoisalsopreparingforaninterviewconsiderpreparingtogether. C.Ifyouneedmoreinformationabouttheinterviewthisisthetimetoask. D.Butdoyouknowhowtoprepareforajobinterview? E.Thinkaboutquestionstheinterviewerislikelytoask. F.Whatarethechancesforprofessionalgrowthinthisjobopportunity. G.Doyourhomework.
利用科学记数法表示的数原来各是什么数2×105=
科学家构建了含有大洋鳕鱼抗冻蛋白基因启动子和大鳞鲑鱼生长激素基因的表达载体并将其导入了大西洋鲑的细胞中获得了生长速度加快的转基因大西洋鲑．相关叙述正确的是
把下列数据用科学记数法表法出来地球上煤的储量估计为15万亿吨以上．
Ittakesabigbrain﹣ahumanbrain﹣todomath.Orsoyoumightthink.Butscientistshavefoundthatotheranimalssuchaschimpanzeesmonkeysandevenpigeonscandosomeadditionandsubtraction减法.Nownewresearchshowsthathoneybees﹣withbrainsthesizeofsesameseeds﹣candobasicmath. Researchersputhoneybeesthrough100trialstotrainthemtoaddandsubtract.TheyfirstputthebeesinaY﹣shapedmaze迷宫andpresentedthemwithacertainnumberofeitheryelloworblueshapes.Yellowshowedthebeesshouldsubtractwhilebluemeanttheyshouldadd. Thebeesthenenteredthedecisionroomwheretheywerepresentedwithacorrectanswerononesideandanincorrectanswerontheotherside.Iftheypickedtherightanswertheywererewardedwithasugarydrink.Ifnottheygotbitterwater.Theresearchersalsoputthebeesthroughanothertesttrialwithoutarewardorpunishmenttomakesurethereweren'tanysmellmarksinfluencingthebees'choices. Atfirstthebeespickedanswersrandomly随意地.Youseethattheabilityofthebeestodoitstartsataboutchancelevel50%showingusthebeesarejustchoosingatrandom.Overtimetheirabilitycomesuptoabout80%sotheyactuallystarttoperformquitewell. ScarlettHowardoneofthestudyauthorsandaresearcheratPaulSabatierUniversityinFrancesaysthebeeswereevenabletoaddandsubtractcorrectlywhenpresentedwithanumbertheyhadneverseenbefore.ThestudyisinthejournalScienceAdvances.Thingslikethisletusknowthere'realotofmysteriestobeexploredthereandtheirbrainsmightnotbeassimplisticasweoncethought.Howardadded. 1thetesttrialonhoneybeeswithoutarewardorpunishmentwasdone. A.tohelpimprovetheircalculatingskills B.toavoidsmells'influenceontheirchoices C.toshowtheimportanceofarewardtothem D.toincreasethechanceleveloftheircorrectanswers 2Whatcanbelearnedfromthelastparagraph? A.Honeybeescanonlyworkoutnumberstaughtbefore. B.Alotofmysteriesabouthoneybeeshavebeensolved. C.Thebrainsizeofhoneybeesdeterminestheircalculatingability. D.Thepowerofhoneybeesbrainsmaygobeyondourexpectations. 3Whatistheauthor'spurposeinwritingthetext? A.Topresenthoneybees'abilitytoperformbasicmath. B.Topersuadepeopletoexploremoreabouthoneybees. C.Todiscusshowhoneybeesrecognizeunfamiliarnumbers. D.Toexplainwhyhoneybeesaresmarterthanotheranimals.
假定你是李华你在某贴吧上看到美国孔子学院ConfuciusInstitute的学生Henry发帖希望通过网络视频互动学习中国诗词.请你给他写封邮件内容包括: 1.表示愿意帮助他; 2.说明你想帮助他的原因. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
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