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如图，校园内一株树与地面垂直，两次测量它在地面的影长，第一次为太阳光线与地面成60°角时，第二次为太阳光线与地面成30°角时，两次影长差8米，则树高 米（结果保留根号）
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小明想测量一棵树的高度他发现树的影子恰好落在地面和一斜坡上如图此时测得地面上的影长为8米坡面上的影长
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HowtoStrengthenTeethNaturally1.Youcanworkonstrengtheningyourteethbygettingtherightvitaminsandmineralsinyourdiet.Youcanalsoprotectyourteeththroughhealthyhabits.Inadditionavoidingcertainfoodsandhabitscanhelpstrengthenyourteeth.◆Gettherightnutrients营养Makesureyou'regetting1000to1200mgofcalcium钙aday.Youprobablyknowcalciumhelpskeepyourbonesstrong.2Eatingcertainamountofcalciuminyourdieteverydaywillhelpincreasethestrengthofyourteeth.◆3.Aimtoeatawidevarietyoffruitsandvegetablesinyourweeklydiet.Tryselectingavarietyofcolorswhenchoosingyourproduceasthatensuresyou'llbegettingawidevarietyofvitamins.Fillyourplateuphalfwaywithfruitsandvegetablesateverymealthenfilltherestofyourplatewithsomeproteinandwholegrains.◆BrushyourteethtwiceadayTobrushwellholdyourtoothbrushata45℃angletoyourteeth.Brushallthesurfacesofyourteethgentlyandtrytobrushforatleast2minutes.4.◆VisityourdentistregularlyVisityourdentistatleastonceayearforx﹣raysandcleaning.5Ifyoustarttogetabuildupofplaque牙菌斑whichcanweakenteeththedentistcanremoveitforyouintime.◆QuitsmokingYouprobablyareawarethatsmokingcauseslungcancerandotherhealthproblems.Inadditionitcanalsoweakenbonetissueincludingyourteeth.Ifyou'vebeenthinkingaboutquittingnowmaybethetime.A.Thesevisitshelpfindproblemsbeforetheybegin.B.Thesefoodsnaturallycleanyourteethhelpingtokeepthemstrong.C.EatabalanceddietD.Thesameistrueforyourteeth.E.Setatimertohelpyoubrushlonger!F.VitaminDhelpsyourbodyabsorbcalciumproperly.G.Strongteethareimportantforahealthymouth!
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阅读下列短文根据所给情节进行续写使之构成一个完整的故事. Desireea4﹣year﹣oldgirlwassobbingquietlyoverherfatherKenwhohaddiedninemonthsearlier.Shewashuggingaphotographofherfatherwithherfingersrunningaroundhisface.DaddyshesaidsoftlyWhywon'tyoucomeback? Insteadofgraduallyadjustingtoherfather'sdeathDesireerefusedtoacceptit.Daddywillbehomesoonshe'dtellhermother.He'satwork.Whensheplayedwithhertoytelephoneshepretendedshewaschattingwithherfather.ImissyouDaddyshe'dsayWhenwillyoucomeback?Desiree'ssituationmadehermotherworried. DayslateritwasKen'sbirthday.HowwillIsendhimacard?Desireeaskedhermother.Howaboutifwetiealettertoaballoonhermothersaidandsendituptoheaven?Desiree'seyesimmediatelylitup. HermothertookhertoastoreandDesireepickedoutaballoonwithHAPPYBIRTHDAYaboveadrawingofTheLittleMermaid美人鱼.Desireeandherfatherhadoftenwatchedit.Thechild'seyesshoneastheywereonthewaytoKen'sgrave.ThenDesireedictatedalettertoherdad.Tellhim‘HappybirthdayIloveyouandmissyou'sherattledoff快速说.‘IhopeyougetthisandcanwritetomeonmybirthdayinJanuary.' Hermotherwrotethemessageandtheiraddressonasmallpieceofpaperwhichwasthenwrappedinplasticandtiedtotheendofthestringontheballoon.FinallyDesireereleasedtheballoon.Foralmostanhourtheywatchedtheshiningspotofsilvergrowsmallerandsmallertilldisappear.NowDad'sgoingtowritebacktomeDesireedeclaredconfidently. Everydaysincethey'dreleasedtheballoonDesireehadaskedhermotherDoyouthinkDaddyhasmyballoonyet?Severalweekspassedandshestoppedasking. 注意 1.所续写短文的词数应为150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. Paragraph1 Oneday3000milesawayWadewasonaduckhuntwhensuddenlysomethinginthebushcaughthiseyes.﹣﹣﹣﹣ Paragraph2 Desiree'sfifthbirthdaycameandlaterontheafternoonapackagearrived.﹣﹣﹣﹣
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高二某班4名同学期末考完试后商量购买一些学习参考书准备在高三时使用大家约定每个人通过掷一枚质地均匀的骰子决定自己去哪购买掷出点数大于或等于5的人去图书批发市场购买掷出点数小于5的人去网上购买且参加者必领从图书批发市场和网上选择一家购买． Ⅰ求这4人中至多有1人去图书批发市场购买的概率 Ⅱ用ξη分别表示这4人中去图书批发市场和网上购买的人数记X＝ξ•η求随机变量X的分布列和数学期望EX．
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马的毛色由两对同源染色体上的等位基因控制其中一对同源染色体的相同基因位点在种群中有AtAa三种基因称为复等位基因相关表现型与基因组成的关系如表．如图是某育种场繁育马的系谱图请回答 1Ⅰ1Ⅰ2的基因型分别为． 2复等位基因AtA和a之间的显隐性关系是At对显性A对显性． 3Ⅱ1与Ⅱ3杂交后代中骝色马出现的几率为． 4如果要鉴定Ⅱ2的基因型可以让其与系谱中的杂交若杂交后代出现骝色马则Ⅱ2的基因型是若杂交后代出现褐骝色马则Ⅱ2的基因型是．
ToooftenalearnerofEnglishwhohasreadoneortwoclassicstriestoimitate模仿theirstyle.Thefacthoweveristhatstylecannotbeimitated.Differentauthorshavedifferentstyles.Theydonottrytowritethewaytheywrite.Sotheimitationofanystyleoftenresultsinaffectation矫揉造作. Andtheresultwillbetillworseifthestyleimitatedisthatofaworkwrittenahundredyearsagoormore.Weareofthe21stcenturyandweshouldnotwritetheEnglishofthelastcentury. Iwouldadviseyounottoaimataspecialstyle.TakecaretowritecorrectsimpleidiomaticandclearEnglishthat'sall. Butimitationisnotalwaysbad.Veryoftenitisimportanttoimitatesomething.Wherepersonalstyleisoutofplaceimitationistheonlymeansbywhichcorrectnessmaybesecured.Inwritinganadvertisementaboutsomethingforexampleyouhavetoimitatesomesuchadvertisementthatyouhaveread.Youcannotpossiblywriteagoodoneifyouhaveneverreadanythoughyoumayhavereadverywidelyingeneralliterature. Youwilldowelltocollectanumberofshortadvertisementsformalinvitationsannouncementsandbusinesscontractsetc.Whenyouhaveoccasiontowriteoneofsuchyouhavesimplytodoalittleimitatingandadapting.Thefollowingisanordinaryformalinvitation Mr.andMrs.M.S.AdamsrequestthepleasureofMr.andMrs.L.J.Williams'scompanyatdinneronSaturdayeveningMaytheseventeenthatseveno'clock86StarStreet. ThisinvitationisfromMr.andMrs.M.S.AdamstoMr.andMrs.L.J.Williams.Surelywiththispiecebeforeyouyoucanwriteanewone.Youhavesimplytochangethenamesthedaythedatethetimeandtheaddress. 1Whyisitespeciallywrongtoimitatethestylecenturiesago? A.Becausethelanguageisoutofdate. B.Becausethewritershavepassedaway. C.Becausethestyleisdifficulttofollow. D.Becausethecontentsarebehindthetimes. 2What'stheauthor'sattitudetowardsimitation? A.Englishlearnersshouldneverimitateothers'writingstyle. B.ImitationisthefirststepforEnglishlearnerstowritearticles. C.Englishlearnersshouldimitateformalwritingstyleslikeadvertisements. D.Itisalwayscorrectforlearnerstoimitatetheclassicwritingstyles. 3Whatdoesthewritermostprobablydo? A.Heisaprofessorinuniversity. B.HeisanEnglishteacher. C.HeisanEnglishnovelist. D.Heisaclassictranslator.
若图1图2图3是某同学做有丝分裂实验时在光学显微镜下观察到的图象下列有关说法正确的是
中国科学家成功突破了克隆猴这个世界生物学前沿的难题率先建立起可有效模拟人类疾病的动物模型实现了我国在非人灵长类研究领域由国际“并跑”到“领跑”的转变．据此冋答下列问题 1克隆猴的诞生体现了动物细胞的具有全能性．相对于植物组织培养而言动物尤其 是高等动物的克隆比较困难的原因最．克隆过程中一般利用未受精的去核卵细胞作为受体细胞原因是． 2克隆猴培养过程中需要用葡处理使细胞从瓶壁上分离下来．为了提高动物细胞克隆形成率可以选择适宜的培养基添加等天然成分以滋养细胞支持生长．培养箱中通常要维持一定的CO2浓度CO2的作用是．克隆猴除了用到动物细胞工程的相关生物技术手段外还必须用到答出两种技术．
UniversityStudentLifeinNorthAmericaFormanywesternersgoingtouniversityisaveryexcitingtimeinlife.1Otherstudentschoosetoliveawayhomeeveniftheygotoauniversitythatisclosetotheparents'house.Thisisusuallythefirsttimethatyoungpeopleliveawayfromtheirparentsandbegintheiradultlives.2Theybelieveitgivesthestudentanopportunitytofacemanynewexperienceswithoutthehelpoftheirparents.Mostwesternershavetheopinionthatagooduniversityeducationneedsabalanceofhardstudyingdoingextra﹣curricularactivitiesanddoingsomefunsocialthingssuchasgoingdancingwithfriends.Oftenstudentsfindaromanticlove.Itiscommontoseetwolovershandinhandastheywalkdownthestreet.3Generallyuniversitiesalsodonotmindifstudentsdate.Inthefirstyearofuniversitystudentsusuallyliveinresidencewheretheymeetpeople.Mostresidenceroomsaredoubleroomswheretwostudentsshareoneroom.Sometimesstudentscangetsingleroomsiftheyarelucky.4Inthesehouseseachstudenthastheirownbedroombutusuallysharesabathroomkitchenandlivingroomwithotherstudents.Itisgettingmoreandmorecommontohavegirlsandboyslivinginthesamehouse.Inthewestuniversitieshavemanyextra﹣curricularactivitiesthatstudentscanchoosefrom.5Iftheyarenotyourthingthenyoucandophotographyartdramaormanyotherthings.Inshortstudentsinwesternuniversitieshavealotoffunfreedomandinterestingexperiences.Workingoutisbecomingamoreandmorepopularactivity.A.Studentscanplaymanydifferentsports.B.Studentsliketogotothegymtoworkout.C.Mostpeoplechoosetogotoauniversitythatisfarawayfromhome.D.Itiscommonforastudenttomoveintoastudent'shousewithfriends.E.Parentsinthewestusuallydonotmindiftheirchildhasfoundalove.F.Manywesternershavefuntryingtostayhealthyandexercisetheirbodies.G.Mostparentsconsidertheirchildleavinghomeforuniversitytobeagoodthing.
关于生物变异的叙述正确的是
5名间排成一排照相其中同学甲站在中间則不同的排法种数为用数字作答
Alistofthetopsevennaturalwondersisrecognizedbymostorganizations.Twoofthemostcommonlylistednaturalwonders1findbelowsealevel.OneofthesewondersistheGreatBarrierReefs.TheotherisBrazil'sHarborofRioDeJanerio.Itisnotonlythebiggestbay2baseontheamountofwaterinitbutalsobecauseofthesurroundingmountainsandrockformations.Twomoreoftheworld'swondersarerelatedtorivers.Bothwondersarenottheriversthemselves3whatiscreatedbyeachriver.OneistheGrandCanyon4iscutthroughthelandscapeofthesouthernUnitedStatesbytheColoradoRiver.Anotheroftheworld'swonderisVictoriaFalls.Itistheworld's5largewaterfallrankedbytheamountofwater6flowoverit.Thenexttwowondersofthenaturalworld7bemountains.ParicutinisavolcanoinMexico.Thereasonwhythisvolcanohasbeenvotedisthatpeopleactuallywatcheditsbirthand8growinthe1940s.ThenOfcoursetheworld'stallestmountainMt.Qomolangmashouldbeadded9thelistofnaturalwonders.Unliketheothersixnaturalwonders10seventhnaturalwonderAuroraBorealiscannotbeseenallthetimeasitcomesandgoesfromdaytoday.
排乳是指哺乳或挤乳时反射性地引起贮存在腺泡和乳腺导管系统内的乳汁迅速排出体外的过程．如图表示排乳的部分调节过程．回答下列问题 1排乳过程的调节方式是．下丘脑细胞合成的催产素能运至垂体并暂时贮存暂时贮存的生理意义是． 2在排乳过程中泌乳素与催产素之间具有作用．泌乳素能作用于乳腺腺泡细胞是由于其细胞膜上分布有． 3催乳师通过按摩能解决产妇无乳乳少等问题据图分析其原因是．
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. Mymomonlyhadoneeye.Ihatedher.Shewassuchanembarrassment. Sheranasmallshopatafleamarketandcollectedoldclothesandsomeotherthingstosellforthemoneyweneeded.Onceduringelementaryschoolitwasfielddayandmymomcame.Iwassoembarrassedandwonderedhowcouldshedothistome?Ithrewherahatefullookandranout.ThenextdayatschoolmyschoolmatesaskedmeYourmomonlyhasoneeye?andlaughedatme. Iwassoangrywithmymomandwishedthatshewouldjustdisappearfromthisworld.SoIsaidtomymomWhydon'tyouhavetheothereye?You'reonlygonnamakemeajoke!MymomtrembledwithshockandsaidinanapologetictoneI'msosorrythatIonlyhaveoneeyeandIwasanembarrassmentforyou.ButIwassoproudofmysontoseeawholenewworldformewiththateye.Iwillleaverightnow.Sorry!Mymomturnedaroundandstaggeredaway. ForthewordsIhadsaidtoherearliertherewassomethingbitingatmeinthecornerofmyheart.EvensoIhatedmyone﹣eyedmomandourdesperatepoverty.Maybebecausemymomhadn'tpunishedmeIdidn'tthinkIhadhurtherfeelingsverybadly. ItoldmyselfthatIwouldbecomesuccessfulinthenearfuturesoIstudiedveryhard.LaterIgotacceptedbytheSeoulUniversity.IleftmymotherandcametoSeoultostudy.Ineverwentbacktovisitmymom. ThenIgotmarriedthere.Iboughtahouseofmyown.ThenIhadkidstoo.NowIamlivinghappilyasasuccessfulman.IenjoythelifeinSeoulbecauseit'saplacethatdoesn'tremindmeofmymomandmypast.Thiskindofhappinesswasgettingbiggerandbiggeruntilonedaysomeoneknockedatmydoor. 注意 1.所续写短文的词数应为150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. Para1Itwasmymom!Andstillwithheroneeye! Para2HoldingtheletterIcriedforthepersonwhoonlylivedforme.
Weallputoffthingsinonewayoranotherfinishingafinalpaperhoursbeforethedeadlineorputtingoffthattriptothesupermarketuntiltherefrigeratorshelvesarecompletelyempty.Psychologistscallthatprocrastinationwhichistodelaydoingsomethingthatyoushoulddousuallybecauseyoudon'twanttodoit. Inrecentyearspsychologistsaroundtheworldhavebeenaskingwhatelseistherebehindprocrastination?ProcrastinationisbasedonourgeneticssaysSharadPaulMDauthorofTheGeneticsofHealth.Ifyouliketoputthingsofforsurftheinternetinsteadofgettingworkdoneyoumightbeabletoblameyourancestors. Whileprocrastinationseemslikeacharacterweaknessitdevelopedforareason.Thegenesprogresseddowngenerationsbecausethesepeoplewerestillhiddenincavesfearfulofanimalsthatfedon meat.Theywerealwayssaying‘Mytoolsarenotsharpenough.I'dbetterspendmoretimeperfectingthisspear.'saysSharadPaul.Thesepeoplesurvivedmorebecausetheyavoidedconflictsandthesegeneswerehandeddowntofuturegenerations. Whileit'shighlyattractivetosimplyblameyourparentsthebuckstopswithyou.PaulsaysPeoplethinkthatgenesdeterminetheirfate.Thisisonlytrueiftheiractionsleadinthatdirection. AnythingcanbechangedorimprovedincludingourgeneexpressionssaysPaulwholikestorefertothe10000﹣hourstheoryMalcomGladwellsharesinhisbookTheOutlierssuggestingthattalentismadewithpracticeandcommitmentnotaborncharacter.Thebestthingtoovercomeprocrastinationistogetmoving.Startslowandkeepbuildingupperseverancelevels.Therearemanydifferentformsofperseveranceexerciseandmanyinvolvelegmovements.Pickonethatyoulike.Anaverageofjust30minutesadayhasbeenshowntobebeneficial. PaulsaysIfyouhavetherightgenesthiscouldbeperhapsabitfasterbutnotbymuch.Thereforethereishopeforusall. 1Whydoestheauthoruseexamplesinthefirstparagraph? A.Tomakereadersfamiliarwiththemselves. B.Tointroducethetopicofprocrastination. C.Toshowourbadbehavioursofprocrastination. D.Toexplainwhywehavethehabitofprocrastination. 2Theunderlinedsentenceinparagraph4probablymeans. A.Genesfromyourparentsaretoblame. B.Youractionsmakeyouhighlyattractive. C.Youshouldtaketheresponsibilityforyourself. D.Youshouldstopthrowingbucksatyourparents. 3What'sbesttitleofthepassage? A.GenesWeaknessorHope? B.GenesPreventionorCure? C.ProcrastinationReasonandSolution. D.ProcrastinationExampleandHistory.
将一枚均匀的硬币投掷6次则正面出现的次数比反面出现的次数多的概率为．
下列关于实验的叙述正确的是
已知+5的展开式中含的项的系数为30则a＝
的展开式中的有理项共有．
在4次独立试验中事件A出现的概率相同若事件A至少发生1次的概率是则事件A在一次试验中出现的概率是
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