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因式分解2x2-4x+2＝ ．
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因式分解x2+x=.
因式分解﹣2x2+4x﹣2
因式分解x2﹣4x+4=
因式分解2x2－4x＋2
因式分解x+2x+4+x2﹣4.
因式分解x2﹣2x=.
因式分解x2x﹣y+y﹣x
解下列方程①2x2－18＝0②9x2－12x－1＝0③3x2＋10x＋2＝0④25x－12＝25x－
①直接开平方法，②配方法，③公式法，④因式分解法
①直接开平方法，②公式法，③、④因式分解法
①因式分解法，②公式法，③配方法，④因式分解法
①直接开平方法，②、③公式法，④因式分解法
因式分解22－x－xx－2
因式分解x2﹣3x=
.因式分解-2x2+4x-2
因式分解x2﹣x=.
x﹣32=2x3﹣x因式分解法
因式分解x2－4x－1
x＋22＝3x＋2因式分解法
因式分解a2x﹣y﹣4x﹣y
因式分解a2x–y+b2y–x
因式分解x2x﹣2﹣16x﹣2=
下面是某同学对多项式x2－4x+2x2－4x+6+4进行因式分解的过程.解设x2－4x=y原式=y+
因式分解x－2x－4＋1
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某科研小组为探究干旱对大针茅草的影响进行了相关实验结果如表所示．回答下列问题 1与对照组相比在干旱条件下大针茅草的光合速率填“升高”“降低”或“不变”原因是． 2实验结果表明干旱时大针茅草通过提高缓解干旱对它的伤害增强抗旱能力但是严重干旱时细胞内水分亏缺会导致叶绿体超微结构破坏类囊体薄膜上的减少进而影响光反应． 3有研究表明钙CaCl2与脱落酸ABA都能够提高大针茅草抗旱能力并且混合使用效果更佳请简要写出证明该观点的实验设计思路．
小白鼠是研究生命活动调节的常用实验动物．回答下列有关问题 1研究人员将鼠笼中暗设的电极突然通电发现小白鼠迅速将踩住电极的前肢移开小白鼠躲避电击的过程主要是通过调节来完成的该过程中的效应器是指前肢的． 2研究人员发现小白鼠的肝细胞膜上存在着与胰高血糖素特异性结合的糖蛋白这说明激素调节的特点是． 3研究发现小白鼠的T细胞活性下降机体产生抗体的量会明显下降原因是．
MostpeopleknowthatMarieCuriewasthefirstwomantowintheNobelPrizeandthefirstpersontowinittwice.HoweverfewpeopleknowthatshewasalsothemotherofaNobelPrizewinner. BorninSeptember1897IreneCuriewasthefirstoftheCuries'twodaughters.AlongwithnineotherchildrenwhoseparentswerealsofamousscholarsIrenestudiedintheirownschoolandhermotherwasoneoftheteachers.ShefinishedherhighschooleducationattheCollegeofSévignéinParis. IreneenteredtheUniversityofParisin1914toprepareforadegreeinmathematicsandphysics.WhenWorldWarIbeganIrenewenttohelphermotherwhowasusingX﹣rayfacilities设备tohelpsavethelivesofwoundedsoldiers.IrenecontinuedtheworkbydevelopingX﹣rayfacilitiesinmilitaryhospitalsinFranceandBelgium.HerserviceswererecognisedintheformofaMilitary'sMedalbytheFrenchgovernment. In1918Irenebecamehermother'sassistantattheCurieInstitute.InDecember1924FredericJoliotjoinedtheInstituteandIrenetaughthimthetechniquesrequiredforhiswork.Theysoonfellinloveandweremarriedin1926.TheirdaughterHelenewasbornin1927andtheirsonPierrefiveyearslater. LikehermotherIrenecombinedfamilyandcareer.LikehermotherIrenewasawardedaNobelPrizealongwithherhusbandin1935.Unfortunatelyalsolikehermothershedevelopedleukemiabecauseofherworkwithradioactivity辐射能.IreneJoliot﹣CuriediedfromleukemiaonMarch171956. 1WhywasIreneCurieawardedaMilitaryMedal? A.Becauseshereceivedadegreeinmathematics. B.Becauseshecontributedtosavingthewounded. C.BecauseshewontheNobelPrizewithFrederic. D.Becausesheworkedasahelpertohermother. 2WheredidIreneCuriemeetherhusbandFredericJoliot? A.AttheCurieInstitute. B.AttheUniversityofParis. C.Atamilitaryhospital. D.AttheCollegeofSévigné. 3WhenwasthesecondchildofIreneCurieandFredericJoliotborn? A.In1932. B.In1927. C.In1897. D.In1926. 4InwhichofthefollowingaspectswasIreneCuriedifferentfromhermother? A.Ireneworkedwithradioactivity. B.Irenecombinedfamilyandcareer. C.IrenewontheNobelPrizeonce. D.Irenediedfromleukemia.
红细胞生成素EPO是体内促进红细胞生成的一种糖蛋白可用于治疗肾衰性贫血等疾病其制备过程如图所示 回答下列问题 1科研人员可以在基因文库中获得含人EPO基因的DNA片段理论上基因组文库含有的基因数量多于cDNA文库中的其原因是． 2步骤①中利用PCR技术扩增EPO基因时首先根据设计出两种引物．为便于后续的剪切和连接应在两种引物的一端分别加上和序列． 3将EPO基因导入到CHO之前要构建基因表达载体的目的是同时使目的基因能够表达并发挥作用． 4科研人员提取了经步骤③获得的重组CHO中的RNA后先通过获得DNA再进行PCR扩增最终未能检测出EPO基因其原因可能是至少答出两点． 5培养重组CHO时要定期更换培养液其目的是．
Grown﹣upsareoftensurprisedbyhowwelltheyremembersomethingtheylearnedaschildrenbuthaveneverpracticedeversince.Amanwhohasnothadachancetogoswimmingforyearscanstillswimaswellaseverwhenhegetsbackinthewater.Hecangetonabicycleaftermanyyearsandstillrideaway.Hecanplaycatchandhitaballaswellashisson.AmotherwhohasnotthoughtaboutthewordsforyearscanteachherdaughterthepoemthatbeginsTwinkletwinklelittlestarorrememberthestoryofCinderellaorGoldilocksandtheThreeBears. OneexplanationisthelawofoverlearningwhichcanbestatedasfollowsOncewehavelearnedsomethingadditional额外的learningtrialsincreasethelengthoftimewewillrememberit. Inchildhoodweusuallycontinuetopracticesuchskillsasswimmingbicycleridingandplayingbaseballlongafterwehavelearnedthem.WecontinuetolistentoandremindourselvesofwordssuchasTwinkletwinklelittlestarandchildhoodtalessuchasCinderellaandGoldilocks.Wenotonlylearnbutoverlearn. Themultiplicationtables乘法口诀表areanexception例外tothegeneralrulethatweforgetratherquicklythethingsthatwelearninschoolbecausetheyareanotherofthethingsweoverlearninchildhood. Thelawofoverlearningexplainswhycramming突击学习foranexaminationthoughitmayresultinapassinggradeisnotasatisfactorywaytolearnacollegecourse.Bycrammingastudentmaylearnthesubjectwellenoughtogetbyontheexaminationbutheislikelysoontoforgetalmosteverythinghelearned.Alittleoverlearningontheotherhandisreallynecessaryforone'sfuturedevelopment. 1WhatisthemainideaofParagraph1? A.Peoplerememberwellwhattheylearnedinchildhood. B.Childrenhaveabettermemorythangrown﹣ups. C.Poemreadingisagoodwaytolearnwords. D.Storiesforchildrenareeasytoremember. 2Theauthorexplainsthelawofoverlearningby. A.presentingresearchfindings B.settingdowngeneralrules C.makingacomparison D.usingexamples 3Accordingtotheauthorbeingabletousemultiplicationtablesis. A.aresultofoverlearning B.aspecialcaseofcramming C.askilltodealwithmathproblems D.abasicsteptowardsadvancedstudies 4Whatistheauthor'sopiniononcramming? A.Itleadstofailureincollegeexams. B.It'shelpfulonlyinalimitedway. C.It'spossibletoresultinpoormemory. D.Itincreasesstudents'learninginterest.
Somepeoplewilldojustaboutanythingtosavemoney.AndIamoneofthem.Takemyfamily'slastvacation.Itwasmysix﹣year﹣oldson'swinterbreakfromschoolandwewereheadinghomefromFortLauderdaleafteraweeklongtrip.TheflightwasoverbookedandDeltatheairlineofferedus400dollarsperpersonincreditstogiveupourseatsandleavethenextday.IhadmeetingsinNewYorksoIhadtogetback.Butthatdidn'tmeanmyhusbandandmysoncouldn'tstay.Itookmynine﹣month﹣oldandtookoffforhome. Thenextdaymyhusbandandsonwereofferedmorecreditstotakeanevenlaterflight.YesIencouraged﹣okayordered﹣themtowaititoutattheairporttoearnmoreDeltaDollars.Ourtotaltake1600.Notbadhuh? NowsomepeoplemaythinkI'mabadmotherandnotsuchagreatwifeeither.ButasabigtimebargainhunterIknowthevalueofadollar.Andthesedaysagooddealissomethingfewofuscanaffordtopassup. I'vemadealivinglookingforthebestdealsandexposing揭露theworsttricks.IhavebeentheconsumerreporterofNBC'sTodayshowforoveradecade.IhavewrittenacoupleofbooksincludingonetitledTricksoftheTradeAConsumerSurvivalGuide.AndIreallydowhatIbelievein. Itellyouthisbecausethereisnoshameingettingyourmoney'sworth.I'malsotightfistedwhenitcomestoshoesclothesformychildrenandexpensiverestaurants.ButIwouldn'thesitatetospendonagoodhaircut.Itkeepsitsshapelongerandit'sthefirstthingpeoplenotice.AndIwillalsospendonaclassicpieceoffurniture.Qualitylasts. 1WhydidDeltagivetheauthor'sfamilycredits? A.Theytookalaterflight. B.Theyhadearlybookings. C.Theirflighthadbeendelayed. D.Theirflighthadbeencancelled. 2Whatcanwelearnabouttheauthor? A.Sherarelymissesagooddeal. B.Sheseldommakesacompromise. C.Sheisverystrictwithherchildren. D.Sheisinterestedincheapproducts. 3Whatdoestheauthordo? A.She'sateacher. B.She'sahousewife. C.She'samediaperson. D.She'sabusinesswoman. 4Whatdoestheauthorwanttotellus? A.Howtoexposebadtricks. B.Howtoreserveairlineseats. C.Howtospendmoneywisely. D.Howtomakeabusinessdeal.
Formydaughter's19thbirthdaythisyearweboughtherticketstogotoseeLinkinParkastheywereplayinginourcity.Wecouldhardly1thembutweknewhowmuchthisband2toherforthisisherfavoriteband.Onthenightofthe3Iwasgladtoseehersoexcitedassheandherboyfriend4.WhentheyreturnedwithT﹣shirtsaprogramandlotsofpicturesofthebandtheir5toldusthatthe6hadbeenwellspent.Thiswouldbeamemoryshewouldnever7andnorwouldwe.Stillfullofexcitementfromthenightbeforethenextdaytheymadeuptheir8togototheshoppingcentreinthedowntownarea.Whentheyreturnedthey9myhusbandandmewithagifteachwiththewords'You'rethebestmum/dadintheworld'10onthem.Insurpriseweaskedherwhysheboughtusgifts.Her11wasthatshejustwantedtoshowussheappreciatedus.12lackingmoneywehadmadeit13forhertoseeherfavoritegroup.Thiswasn'tsomethingnewfromourdaughtershehad14givenusgiftswhenshewantedto15herfeelings.Touseachgiftwasan16ofjoy.Itcouldhavebeenanythingitwouldn'thavemattereditwasthe17itselfandthefeelingbehindit.Iwasalittleproud18IknewIdidsomethinggreatwhenI19mydaughteradaughterwhowantedtoshowyouhowmuchyouwerevaluedandloved.Itistruethattheysayitisbetterto20thantoreceive!Mydaughtertaughtmethatfromtheminuteshewasbornandstilldoestothisday.1A.attend B.listen C.visit D.afford2A.stuck B.agreed C.meant D.applied3A.party B.concert C.meeting D.lecture4A.setoff B.turnedup C.cameback D.wokeup5A.expression B.instruction C.expectation D.explanation6A.performance B.time C.effort D.money7A.remember B.forget C.lose D.remain8A.hearts B.heads C.minds D.senses9A.supplied B.presented C.provided D.equipped10A.drawn B.pressed C.written D.read11A.reply B.opinion C.intention D.problem12A.Exceptfor B.Inspiteof C.Insteadof D.Asaresultof13A.necessary B.difficult C.comfortable D.possible14A.always B.never C.occasionally D.seldom15A.hide B.explain C.express D.impress16A.prize B.surprise C.symbol D.award17A.gift B.value C.importance D.act18A.because B.though C.unless D.until19A.understood B.changed C.raised D.helped20A.accept B.give C.take D.borrow.
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Intoday'sworldofsmartphonesandlaptopsmostpeoplehaveatleastonetime﹣tellingthingwiththem.Sincethesedigitalproductsaresocommonistimerunningoutforthe500﹣year﹣oldwatch?Accordingtosomeconsumerstheanswerisyes.NewJerseyteenagerCharlieWollmansaysawatchisanextrapieceofequipmentwithnonecessaryfunction.Manyyoungadultsthinksoandusetheirsmartphonestotelltime.Itissaidthatfeweryoungpeoplewearwatchestodaythantenyearsago.Asaresultsomepeoplesaythatthewatchindustryisatacrossroads. Howeverwatchmakersoptimisticallysaythatwatchesredeempopularitywhenconsumersreachtheir20sand30s.Bythentheyarewillingtospendmoneyonaqualitywatchthatdoesn'tjustkeepgoodtime.Fiftyyearsagowatchmakerstookprideintheirproducts'accuracy.Butinrecentyearsthewatchindustryhaschangeditselfintoanaccessory配饰business.Andtodaytheimageawatchconveyshasbecomemoreimportantthanthetimeittells. Complications﹣featuresthatgobeyondsimpletimekeeping﹣areanimportantpartofawatch'simage.Today'swatchesofferlotsoffeaturesthatmeetalmostanypersonality.ThesefeaturesincludecompassesUSBdriversandevenotherfunctionsthatmeasuretheeffectivenessofgolfswings! Creativityalsoplaysakeyroleindesigningtoday'swatches.ForexampleJapanesewatchmakerTokyoflashmakeswatchesthatdon'tevenlooklikewatches.Thecompany'spopularShinshokumodelusesdifferentcolorlightstotelltime.Itlooksmorelikeafashionablebraceletthanawatch. Whetherawatchconveysfashionsensecreativetalentoraloveofsportsconsumerswanttheirwatchestostandout.Nowadayseveryonehasthesamekindofgadget小玩意intheirbagssopeoplewanttomakeastatementwithwhat'sontheirwrists.Willthisinterestinwristfashionlast?Onlytimewilltell! 1Whatcanweknowfromthefirstparagraph? A.Asmostpeopleseewatchesareoutoffashion. B.Somepeoplefeelthatwatcheshavebeenofnouse. C.Thewatchindustrywillclosedownsoonerorlater. D.Therearesomanychoicesofwatchesforteenagerstoday. 2Accordingtothepassagewhatimagedoesawatchconveynowadays? A.Itsimplytellstime. B.Itappealstomanyteenagers. C.Ithasmanycomplexfunctions. D.Ithasanimpactoncreativityandimagination. 3JapanesewatchmakerTokyoflashismentionedinParagraph4to. A.showwhyShinshokuwatchesarepopular B.advertiseShinshokuwatchesmadebyTokyoflash C.tellthattoday'swatchesneedmoreimagination D.makeacomparisonbetweenwatchesandbracelets 4Whatmaybethebesttitleforthepassage? A.WatchesTellMoreThanTime B.JapaneseWatchesStandOut C.WatchIndustryIsinaBadSituation D.WatchesAreBecomingLessPopular
Aprecious受人疼爱的littlegirlinNewYorkwithburns烧伤over75percentofherbodyhasonlywishforChristmasthisyearenoughChristmascardstofillheraunt'scardtree. TwoyearsagoSafyreTerrylostherfatherandthreeyoungersiblings娣妹inafiresomeonelitintheupstairsstairwell楼道leadingtoherfamily'sapartment.Safyrewasfoundnexttoherfatherwhousedhisbodytoshieldherfromtheflames火焰.Inadditionto除了sufferingfromsevereburnsSafyrelostherrighthandandleftfoot.Sheunderwent经历morethan50surgeries外科手术tograft种植skinoverherburns. Sincehermotherhadsignedovercustodialrights监护权tothestateLizDolderSafyre'sauntpetitioned请愿thecourts法院tobecomeherguardian监护人.Safyrelosteverything﹣﹣herfatherhermotherhersisterherbrothersherhomeherfavoritetoyherfavoriteoutfit﹣everythingthatwasfamiliartoherDoldertoldTODAY.Sheevenlosttheonethingwealltakeforgranted﹣herreflection.Butshewakeseverymorningwithasmileonherface.Sheisthetruedefinition定义ofhopefaithandlove. DoldertoldBuzzfeedsheboughtatreetohangChristmascardsonthisyearandSafyreinstantly立刻gotexcitedShesaid‘Ican'twaittofillitup'andmyresponsewas‘Honeythat'sprobablynotgoingtohappen.Wemaybeget10cardsayearandthecardtreeholds100. AfterDoldersharedaphotoofSafyrenexttothetreewithherFacebookcommunityasupporterofthefamilyKevinClarkaskedforpermissiontosharethephotoalongwithanaddresswherepeoplecouldmailcardsandfulfill完成Safyre'sChristmaswish.Therequesttookoffonsocialmedia该请求在社交媒体上反响强烈.Manycardshavealreadystartedtocomein. 1Whatistheprobablemeaningoftheunderlinedwordshieldinthesecondparagraph? A.present. B.prevent预防. C.protect. D.recover恢复. 2WhichwordcanbestdescribeSafyreTerry? A.Enthusiastic热情. B.Optimistic乐观. C.Pessimistic悲观. D.Realistic现实. 3Whichofthefollowingcanbethebesttitle最佳标题ofthetext? A.ALittleGirlLostHerFamilyinaFire. B.ALittleGirlGotBurntinaFire. C.ALittleGirlGotAdoptedbyHerAunt. D.ALittleGirlWishedtoFillHerAunt'sCardTree. 4WhydidDolderpetitionthecourtstobecomeSafyre'sguardian? A.BecauseSafyrepreferredtolivewithLizDolder. B.BecauseSafyrewashomelessandhadtolivewithher. C.BecauseSafyre'smothertransferredcustodialrightstothestate. D.BecausethegovernmentrefusedtotakecareofSafyre.
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假定你是高三学生李华从网上获悉一家国际青少年自愿者组织正在全球招募暑期志愿者. 请写一封电子邮件申请参加.主要内容如下 1.写信目的 2.自我介绍 3.希望获准. 注意 1.词数100左右 2.文章的开头和结尾已给出不计入总词数 3.可适当增加细节以使行文连贯. DearSirorMadam . Withallmybestregards. Yourssincerely LiHua.
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Third﹣CultureKidsDidyougrowupinonecultureyourparentscamefromanotherandyouarenowlivinginatotallydifferentcountry?Ifsothenyouareathird﹣culturekid!Theterm'third﹣culturekid'orTCKwasfirstusedinthe1960sbyDr.Ruth.ShefirstcameacrossthisphenomenonwhensheresearchedNorthAmericanchildrenlivinginIndia.Caughtbetweentwoculturestheyformtheirveryown.1.About90percentofthemhaveauniversitydegreewhile40percentpursueapostgraduateordoctordegree.Theyusuallybenefitfromtheirinterculturalexperiencewhichhelpsthemtogrowintosuccessfulacademicsandprofessionals.2.Infactmanyhardshipsmayarisefromthisphenomenon.Athird﹣culturekidmaynotbeabletoadaptthemselvescompletelytotheirnewsurroundingsasexpected.Insteadtheymayalwaysremainanoutsiderindifferenthostcultures.Maxforexampleexperiencedthisfeelingofstrangenessthroughouthislifeasathird﹣culturekid.3Whilethiscanbeawaytocreateanetworkoffriendsallaroundtheworlditcanbedifficultforathird﹣culturekidlikeMaxtomaintainclosefriendshipsandrelationships.Forathird﹣culturekiditisofteneasiertomovetoanewforeigncountrythantoreturntotheir'home'country.AfterlivinginAustraliaandSouthKoreaformanyyearsLouisfinallyreturnedtoTurkeyasateenager.Butshefeltoutofplacewhenshereturnedtothecountrywhereshewasborn.4.Shedidnotsharethesamevaluesasherfriends'evenyearsaftergoingbackhome.Whileathird﹣culturekidmustletgoofhis/heridentityasaforeignerwhenhe/shereturnsthehomecountrycanprovetobemoreforeignthananythinghe/shecameacrossbefore.Thepeergrouptheyfacedoesnotmatchtheidealized理想化的imagechildrenhaveof'home'.5.Asapartofthegrowing'culture'TCKsmayfinditagreatchallengeforthemtofeelathomeinmanyplaces.A.Thisoftenmakesithardforthemtoformtheirownidentity.B.Yetbeingathird﹣culturekidisnotalwayseasy.C.Ingeneraltheyoftenreachexcellentacademicresults.D.Howevertheirparentscanhelpthemseetheopportunitiesofamobilelifestyle.E.Theirexperienceabroadhelpsthemtounderstandculturaldifferencesbetter.F.Additionallymakingnewfriendsandsayinggoodbyetooldoneswillatsomepointbecomeroutineforathird﹣culturekid.G.Unlikeotherteensofherageshedidn'tknowanythingaboutcurrentTVshowsorfashiontrends.
Shakespeare'sBirthplaceandExhibitionofShakespeare'sWorld Welcometotheworld﹣famoushousewhereWilliamShakespearewasborninl564andwherehegrewup.Theproperty房产remainedintheownershipofShakespeare'sfamilyuntil1806.TheHousehaswelcomedvisitorstravelingfromallovertheworldforover250years. OPENINGTIMES 20Mar.to19Oct. Mon.toSat.900a.m.to500p.m. Sun930a.m.to500p.m. 20Oct.to19Mar Mon.toSat900a.m.to400p.m. Sun.1000a.m.to400p.m. ◆EnterthroughtheVisitors'Centreandseethehighly﹣praisedexhibitionShakespeare'sWorldalivelyandfullintroductiontothelifeandworkofShakespeare. ◆StandintheroomswhereShakespearegrewup. ◆DiscoverexamplesoffurnitureandneedleworkfromShakespeare'speriod. ◆Enjoythetraditional传统的Englishgardenplantedwithtreesandflowermentionedinthepoet'sworks. ◆TheBirthplaceiswithineasywalkingdistanceofallthecarparksshownonthemapnearestisWindsorStreet3minutes'Walk ◆TheHousemaypresentdifficultiesbuttheVisitors'Centreitsexhibitionandthegardenareaccessibletowheelchairusers. ◆TheShakespeareCoffeeHouseoppositetheBirthplace ADMISSION Adult￡4.90 Child￡2.20 Family￡12.00 2adults+upto3children 1Howmuchistheadmissionforafamilyoftwogrown﹣upsandtwochildren? A.￡9.80. B.￡12.00. C.￡14.20. D.￡16.40. 2WhereisthenearestparkingplacetoShakespeare'sBirthplace? A.Behindtheexhibitionhall. B.OppositetheVisitors'Centre. C.AtWindsorStreet. D.NeartheCoffeeHouse. 3Awheelchairusermayneedhelptoenter. A.theHouse B.thegarden C.theVisitors'Centre D.theexhibitionhall
Inyourdailylifetherearemanyexampleswhereyourparentscontrolhundreds1thingsforyouwhenyouareakidsuchastheclothesyouwearthefoodyoueatwhereyougoandhowyougetthere.Itisagoodthing.Kidsneedthiskindof2protectandhelpbecausetheyarenotoldenoughtotakecareof3andmakedecisions4correct.Butwithkidsgrowing5oldthepartofbeingateenisdevelopingyourownidentity﹣onethat6separatefromyourparents'.Differentattitudestowardseventslikepartyingmayleadtoargumentsbecauseyourparentswillalwayswanttoprotectyouandkeepyousafenomatterhowoldyouare.As7resultyourparentsfeelithardtogetusedtothenewsituationwith8increaseanxiety.Whatkidsshouldkeepinmindis9inmostcasesyourparentscanrelatetowhatyou'regoingthroughbecausethey10beteensonce.
Manypeoplebelievethatyoulosetheability能力tolearnnewlanguagesasyougetolder.Languageexperts专家howeverwilltellyouthatyou'renevertoooldtolearnanewlanguage.Asyougetolderitcanbemoredifficulttolearnanewlanguagethough. Childrenandadultslearnnewlanguagesindifferentways.Forchildrenlanguageistheirlife.Theystudyforthousandsofhourseveryyearbecausetheyneedtolearnlanguagetobecomepartoftheircommunities.Adultsontheotherhandarealreadypartofalanguagecommunity.Learninganewlanguagemeansbecomingpartofanotherlanguagecommunityandadultsrarelygetthechancetopracticeasmuchasyoungchildrendo. Moreoverchildrenlearninganewlanguageareexpected预料tomakemistakes.Thisgivesthemfreedomwhenlearningtobedaringandconfident勇敢自信.Adultshoweveroftenfeelpressuredtobeperfect完美whenlearninganewlanguage.Thiscanintimidate使害怕manypeopleandmakeitevenhardertolearnanewlanguage. Researchhasshownthatchildrenwholearnanewlanguagewhentheyareveryyoungarenotlikelytohaveaforeignaccent口音whenspeakingadifferentlanguage.Somescientistsalsobelievethatitcantakeupto10000hoursofstudytomaster掌握anewlanguage.Thiscanbedifficultforadultstoachievebutyoungchildrencanaccumulate积累thosehoursoverseveralyearsastheygrowup. Whenyoungchildrenlearnanewlanguagetheycometoseemultiplelanguagesasanormalpartofsociety.Thismindset思维模式helpsthemembrace接纳learninganewlanguagewithoutfeelinglikethey'redoingsomethingunusualortoohard. Soifyouwanttolearnanewlanguagegoforit!It'snevertoolatetolearnanewlanguage.Ifyou'reolderitmaytakemoreworkbutitcanbedone.Ifyou'reayoungchildthoughnowisthetimetostepoutandlearnanewlanguage! 1Bylanguageistheirlifetheauthormeansthatchildren. A.can'tlivewithoutlanguage B.uselanguagefromtimetotime C.practiceanewlanguagealot D.aregoodatspeakinglanguage 2Whatmaymakeithardfortheoldpeopletolearnanewlanguage? A.Theyusuallyhavetoomanyinterests. B.Theyareafraidofbeinglaughedat. C.Theythinkmakingmistakesisnatural. D.Theyalwaysmakeallkindsofmistakes. 3Accordingtotheauthoranewlanguage. A.canneverbelearnedbytheoldpeople B.canbegraspedbytheoldpeopleeasily C.canbelearnedbyboththeoldandtheyoung D.isanimportantskillfortheoldpeople 4Theauthordevelopsthispassageby. A.makingseveralcomparisons比较 B.presenting提供researchfindings C.offeringsometypical典型examples D.tellingsomeinterestingstories
某地经过开垦后荒山变为果林洼地成为鱼塘加快了地方经济的发展和人民脱贫致富奔小康的步伐．回答下列问题 1山顶和山脚种植了不同的果木这体现了群落的结构． 2调查该果林的能量流动过程发现上一营养级同化的能量不能100%的流入下一营养级原因是． 3若鱼塘的环境条件不变经过捕捞后某种鱼的环境容纳量会填“变大”或“变小”或“不变”原因是． 4鱼塘生态系统需要人工不断地添加饲料以维持其正常功能从能量流动和物质循环的角度说明其原因是．
某雌雄异株植物的性别决定方式为XY型花色有白色黄色红色三种由仅位于X染色体上的等位基因Aa和位于常染色体上的等位基因Bb共同控制相关色素的合成过程如图所示．回答下列问题 1该植物花瓣中色素的合成过程说明基因与性状关系是． 2两红花植株杂交子代出现了的黄花植株则子代中红花植株与白花植株的比例为． 3请从第2题杂交实验的子代中选择实验材料设计一次杂交实验以确定某白花雌株的基因型写出相关的实验思路并预期实验结果和结论．．
Childrendonotthinkthewayadultsdo.Formostof1firstyearoflifeifsomethingisoutofsightitisoutofmind.2youcoverababy'sfavoritetoywithapieceofcloththebabythinksthetoyhasdisappearedandstops3lookforit.A4﹣year﹣oldmayobjectthathis/hersisterhas4muchfruitjuicewhenitisonlytheshapesoftheglassesthatdiffernottheamountofjuice.Yetchildrenaresmart5theirownway.Likegoodlittlescientistschildrenarealwaystestingtheirchild﹣sizedtheoriesabout6thingswork.Whenyourchildthrowsherspoononthefloorforthesixthtimeasyoutrytofeedherandyousay'That'senough!Iwillnotpickupyourspoonagain!'thechildwill7immediatetestyourclaim.Areyouserious?Areyou8annoy?Whatwillhappenifshethrowsthespoonagain?Sheisnotdoingthistodriveyoucrazyrathershe9learnthatherdesiresandyourscandifferandthatsometimesthose10differareimportantandsometimestheyarenot.
Itisneverpossibletoleadalifewithoutanystress压力butitispossibletopreventstressaswellasreduceitseffectwhenitcan'tbeavoided.1.Tryphysicalactivity2.Runningwalkingplayingtennisandworkinginyourgardenarejustsomeoftheactivitiesyoumighttry.MaketimeforyourselfScheduletimeforbothworkandentertainment娱乐.Don'tforgetplaycanbejustasimportanttoyouroverallwell﹣beingaswork.3.Gowindow﹣shoppingorworkonahobby.Allowyourselfatleastahalfhoureachdaytodosomethingyouenjoy.Takecareofyourself4.Ifyoueasilygetangryandcan'tsleepwellenoughorifyou'renoteatingproperlyitwillbemorelikelythatyouwillfallintostressfulsituations.Ifstressrepeatedlykeepsyoufromsleepingyoushouldconsult咨询adoctor.5Stresscanresultfrom导致disorganizationandafeelingthat'there'ssomuchtodoandnotenoughtime'.Tryingtotakecareofeverythingatoncecanbetoomuchforyouandasaresultyoumaynotachieveanything.Insteadmakealistofeverythingyouhavetodoandthendoonethingatatimecheckingoffeachtaskasitiscompleted.Setouttodothemostimportanttaskfirst.A.Youshouldmakeeveryefforttoeatwellandgetenoughrest.B.Dowhateveryoulikeandwanttodo.C.Thefollowingaresuggestionsforwaystodealwithstress.D.Youneedabreakfromyourdailyroutinetojustrelaxandhavefun.E.Whenyouarenervousangryorupsettryreleasingthepressurethroughexerciseorphysicalactivity.F.Youcouldsmiletoyourselfinfrontofamirroreveryday.G.Makealistofthingstodo.
Myparentshavean安排meetingwiththeteacheronMonday.
SigningupforadigitalTVserviceprovidesyouwithaccesstoover200channelsfromallovertheglobe.Howevertelevisiontodayisdominatedbyadultlanguagemakingithardforconcernedfamiliestofindchannelssuitableforyoungeyes.ThereforemostmoviechannelsareautomaticallyremovedformthelistofTVchannelsforanentirefamily.Thefollowingaresomegoodonesbasedonpopularityonaglobalscale. DiscoveryChannel Discoveryanditsmanychannelscanbeconsideredasthefoundingfatherofinformativechannelsontelevision.WhatNationalGeographicdoesinascholastic学术的mannerDiscoverytriestodoinanentertainingmanner﹣educatingthemassesaboutanythingandeverything. FoxFamily FindingamoviechannelthatbroadcastspicturessuitableforteenagersandkidsalikeisverydifficultunlessyourserviceoperatoroffersyouFoxfamilymovies.Thischannelscreensmostmoviesbeforeitbroadcaststhemensuringthatnomovieshowsunacceptablematerialforyoungeyes. Nickelodeon AchannelverysimilartoCartoonNetworkitmostlyshowsUSprograms.Howevertheirshowsaresometimesabitmorematureforyoungerkidsandbettersuitedtokidsaged5andup. ABCFamily ABCstartedtheABCfamilychannelinanattempttointroducefamily﹣centeredshowsandserialstothepublicintheUSA.TheneedforthischannelwasfeltafterABCobservedthelackofproperfamilytypeUSchannels. Living IftravellingisafamilyhobbyandbetterlivingisthemottothenthereisnobetterchannelthanLiving.Kidscanseenever﹣seen﹣beforesightslearningaboutnewplaceswhileadultscanpracticetheircookingandlearnamazingthingsaboutmotorbikes. 1AccordingtothetextmostchannelsofferedbyadigitalTVservice. A.cankeeppeopleawayfromTVviolence B.arewelcomedbyfamilieswithsmallchildren C.areconcernedabouttheproperuseoflanguage D.areunsuitableforthewholefamilytowatchtogether 2WhichofthefollowingcanbestdescribeDiscoveryChannel? A.Relaxing. B.Touching. C.Commercial. D.Professional. 3Ifpeoplewanttoknowaboutwhatatraditionalfamilyisliketheycanchoose. A.FoxFamily B.Nickelodeon C.ABCFamily D.Living
假设你是李明你的新西兰笔友Tom将于八月来四川旅游特来信询问有关旅游景点的情况.请根据下表所提供的要点写一封回信并表示盼望他的到来. 注意1.词数100左右信的格式及开头已为你写好不计入总词数. 2.可根据内容要点适当增加细节以使行文连贯. 3.参考词汇省份﹣province都江堰水利工程﹣DujiangyanIrrigationProject九寨沟﹣Jiuzhaigou DearTom I'mgladtohearthatyou'recomingtoSichuaninAugust. Yourssincerely LiMing.
下列有关内环境稳态及调节的叙述错误的是
Morepeoplewouldbe吸引tocyclingifconditionswererightincities.
Theruralenvironmenthasa积极的effectonthechildren'shealth.
Thepoliceputthe责备fortheaccidentonthedriver.
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∧并在其下面写出该加的词. 删除把多余的词用斜线﹨划掉. 修改在错词下面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. Myhometownisasmallvillagesurroundingwithhills群山环绕.Smallasitisbutit'sverybeautiful. IcanstillrememberthedayswhenIspentwithmyfellowboysthereonmychildhood.Inspringweoftenflykitesmadebyourselvesonthetopofthehills.Thekiteswentveryhigh.Insummerthetreesweregreenandtheflowerwerebrightonthehills.Besidesthewildapplestastednicely.Inautumncorns玉米atfootofthehillswereripe成熟.Inwinterwhenitsnowedsomethingwascoveredwithsnow.Weplaywithsnowmainlymakingsnowmenandfightingbattles打仗withsnow. Todayinmyhometowntherearestillblueskyfreshairsweetwaterandkindpeople.Ilovemyhometown.
种群增长率是指单位时间内新增加的个体数占种群个体总数的比率可表示为×100%．调查某种群一段时间内某些特征的变化得到如图AB两条曲线以下分析正确的是
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