首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
某小组5名同学在一周内参加家务劳动的时间如表所示,关于“劳动时间”的这组数据,以下说法正确的是( )
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
为了了解学生参加家务劳动的情况某中学随机抽取部分学生统计他们双休日两天家务劳动的时间将统计的劳动时间
某小组同学在一周内参加家务劳动时间与人数情况如表所示下列关于劳动时间这组数据叙述正确的是A.中位数是
语文综合能力校团委请你对中学生参加家务劳动情况进行一次专题调查了解中学生参加家务劳动的情况请从不同角
为了了解某班学生每周家务劳动的时间某综合实践活动小组对该班9名学生进行了调查有关数据如下表.则这9名
3,2.5
1,2
3,3
2,2
孩子上中学后学习负担重了家长的正确做法是
不让孩子参加家务劳动,以免影响学习
让孩子参加一定的家务劳动,养成积极的生活态度
愿干就干,对孩子不做要求
某校九1班对全班50名学生进行了一周按7天计算做家务劳动所用时间单位h的统计其频率分布如下表该班学生
某班25名同学在一周内做家务劳动时间如图所示则做家务劳动时间的众数和中位数分别是
2和1.5
1.5和1.5
2和2.5
1.75和2
某小组5名同学在一周内参加家务劳动的时间如表所示关于劳动时间的这组数据以下说法正确的是
中位数是4,平均数是3.75
众数是4,平均数是3.75
中位数是4,平均数是3.8
众数是2,平均数是3.8
如图是21名同学最近一周做家务劳动次数的条形统计图.他们这周一共做家务劳动56次平均每人这周做家务劳
为了解七年级学生参与家务劳动的时间李老师随机调查了七年级8名学生一周内参与家务劳动的时间单位小时分
2.5
3
3.375
5
某小组7名同学在一周内参加家务劳动的时间如下表所示关于劳动时间的这组数据以下说法正确的是
中位数是4,众数是4
中位数是3.5,众数是4
平均数是3.5,众数是4
平均数是4,众数是3.5
某小组5名同学在一周内参加家务劳动的时间如下表所示关于劳动时间的这组数据以下说法正确的是21·cn·
中位数是4,平均数是3.75
众数是4,平均数是3.75
中位数是4,平均数是3.8
众数是2,平均数是3.8
某小组5名同学在一周内参加家务劳动的时间如表所示关于劳动时间的这组数据以下说法正确的是
中位数是4,平均数是3.75
众数是4,平均数是3.75
中位数是4,平均数是3.8
众数是2,平均数是3.8
材料一德国法律明文规定6~10岁的孩子要偶尔帮父母洗碗扫地买东西10~14岁的孩子要割草坪洗碗扫地给
某校调查了20名男生某一周参加篮球运动的次数调查结果如表所示那么这20名男生该周参加篮球运动次数的平
3次
3.5次
4次
4.5次
某小组5名同学在一周内参加家务劳动的时间如表所示关于劳动时间的这组数据以下说法正确的是
中位数是4,平均数是3.75
众数是4,平均数是3.75
中位数是4,平均数是3.8
众数是2,平均数是3.8
家务劳动时间缩短的主要途径包括
减少家务劳动
增加闲暇时间
增加工作时间
家务劳动机械化
家务劳动社会化
某小组5名同学在一周内参加家务劳动的时间如表所示关于劳动时间的这组数据以下说法正确的是
中位数是4,平均数是3.75
众数是4,平均数是3.75
中位数是4,平均数是3.8
众数是2,平均数是3.8
某小组5名同学在一周内参加家务劳动的时间如下表所示关于劳动时间的这组数据以下说法正确的是
中位数是4,平均数是3.75
众数是4,平均数是3.75
中位数是4,平均数是3.8
众数是2,平均数是3.8
为了了解学生参加家务劳动的情况某中学随机抽取部分学生统计他们双休日两天家务劳动的时间将统计的劳动时间
热门试题
更多
TheNationalStorytellingYouthOlympicsisaneventwherethousandsofkidsfromgrades6to12competeagainsteachotherbytellingstories.ItissponsoredbytheMaster'sDegreePrograminReadingandStorytellingatEastTennesseeStateUniversity.Thesolepurposeofthiseventistopromoteandencourageboththeartandscienceofstorytellingamongmiddleschoolandhighschoolstudents.Althoughthiseventiscompetitiveitsunderlying内在的intentandgoalistoprovidestudentsacrossthenationwithareasontopractisenumerousnoncompetitiveskills. Thoseskillsincludeskillfulsportsmanshipresponsiblebehaviorandanattitudeofrespectforothersandthestorytellingstyle.TheeventualgoaloftheNationalStorytellingYouthOlympicsistoencourageeveryclassroominAmericatodiscoverorrediscoverthebeautyofstorytellingandstoryperformance.TheNationalStorytellingYouthOlympicstakesplaceusuallyaroundthefirstweekendinMarch.StudentsfromalloverthecountryarrivebybusplaneorautomobileinJohnsonCityTennessee.TheyusuallyarriveonThursdayorFriday.ThosethatarriveonThursdaymakeuseoftheirearlyarrivalbytellingstoriesatlocalschools.OnFridayaneveningmealispreparedforallcontestantscoachesandparents.Gamesareplayedstoriesaretoldandlifetimefriendshipsbegin.Saturdayisthedayofthebigevent.Aluncheon午餐会isheldintheafternoonsocontestantscanfamiliarizethemselveswiththesurroundingsanddoasoundcheck. Theeventisdividedintothreecategoriesseparatedbygrades.Contestantsarejudgednotonlybytheirstorytellingperformancebutalsobytheattitudeandbehaviortheydisplayduringtheentireweekend.AwinnerispickedfromeachofthethreecategorieshoweverthereisanoverallwinnerwhoisawardedthenameofGrandTorchBearer.Thispersonisselectednotonlybythejudgesbutalsobythecontestants.Afterthewinnershavebeenannouncedthecontestantsretreatbacktotheirhotelwhereacelebratoryicecreampartyisheldandbelieveitornottheytellmorestories!ThisiswhattheNationalStorytellingYouthOlympicsisallaboutdevelopingalovefortheartofstorytelling. 1WhywouldsomeoneMOSTLIKELYchoosetoattendtheNationalStorytellingYouthOlympics? A.Toimprovestorytellingskillswhilemeetingnewfriends. B.Tocompetefiercelywiththebeststorytellersinthecountry. C.Toearnmoneyandfame. D.Todevelopone'spersonalskillinlectureonly. 2Whenisdinnerpreparedforallcontestantscoachesandparents? A.Wednesday. B.Friday. C.Thursday. D.Saturday 3WhichofthefollowingsetsofwordsbestdescribestheGrandTorchBearer? A.competitiveambitioustalented B.respectfulresponsibleskilled C.athleticdeterminedcreative D.imaginativeindividualisticpessimistic 4Whatistheauthor'sattitudetowardstheactivity? A.Critical B.Positive C.Neutral D.Indifferent
下列具有细胞壁但成分不含纤维素的是A.乳酸菌 B.洋葱根尖细胞 C.噬菌体 D.马蛔虫受精卵
Traditionallyweusuallygetageneralimpressionof1strangersstrangerbythewaytheyshakehandstalkorwalk.Howeverintheageofsocialnetworkingfirstimpressionsaresometimesmade2bylookingattheirprofilephotosonsocialplatformslikeTwitterorWeChat. Thesesocialimagessayalotaboutourpersonalityaccordingtoarecentstudyin3whichresearchersusedasoftwaretoanalyzetheprofilephotostofindoutwhethertherewasaconnectionbetweenaperson'spersonalityandhisprofilephoto. Theresultrevealsthatopen﹣mindedpeoplearemorelikely4toposeposewithanobjectintheirprofilephotos.Their5excitedexcitefacescantellhowmuchtheyenjoytheirexperiences.Meanwhileneurotic神经质的peopletendtochoosephotosofobjectsratherthanselfiestoavoid6lookinglooktoomiserablebecauseofthestrongsocialpracticeagainstasadorangry7appearanceappearinprofilephotos. Apartfromtheobjectsinprofilephotosthecolorsusedinthemalsoshow8howoutgoingtheowneris.Forexampleextroverts性格外向者9arefoundfindtohavethemostcolorfulprofileimagesastheywanttoemphasizetheirpersonality. Nexttimechoosingaprofilephotomaybeweshouldask10ourselveswefirstwhatkindofimagewe'dliketoconvey.Afterallapictureisworthathousandwords.
下列是表示①②③④四个框图内所包括生物的共同特征的叙述正确的是 A.框图①内都是原核生物都有成形的细胞核B.框图②内的生物都不含叶绿素都是异养型C.框图③内的生物都具有细胞结构且都有细胞壁D.框图④内都是自养生物且都含有核糖体
AFloridswomanwalkedintoaPublicsupermarketlastweek.Sheaskedan1questionatthebakerycounterArethereanyfirst﹣birthdaycakesscheduledfor2overtheweekend NickDeClementewhoworksatthestorewasinitially3bytherequest.Hethenaskedifthewomanhadany4personinmind.Tohissurpriseshedidn't. ThewomansaidNoIwanttopayforoneanonymously匿名 Minuteslatershestartedtoburstinto5.Shethenexplainedtohimthatherbabywasborn6oneyearagoandshewantedto7hismemoiybypayingforanother1﹣year﹣old'sbirthdaycake. Iwasalittlelostforwordsjustbecauseofthedeep8IdevelopedforherDeClementerecalled.He9apileofcakeordersandpickedoutanorderforabirthdaycakefora1﹣year﹣oldboynamedDavid.Thebuttercreamtoppedsheetcakewhich10atleast20peoplecost$32.99.Thewoman11agreedtopay. ShetoldmeThankyouand12thatIletherdothisDeClementesaidIhopethatthisladyfinds13throughthisgiftandthatthecustomerreceivingthisgiftwillpayit14Itoldherhowmuchitmademy15especiallybecauseIhavealittleboyonthewayandwishedhermany16DeClementesaidexplaininghewasstandingbythestoreysfrontdoorasshewas17. Thedad﹣to﹣besaidhenevergothernamenordidhegeta18toexplaintothecustomerwhosecakewaspaidforthestorybehindthe19gesture﹣buthehopestheirpaths20gain. 1A.common B.unusual C.personal D.difficult 2A.pick﹣up B・decoration C.discount D.giveaway 3A.amused B.struck C.confused D.disturbed 4A.proud B.specific C・missing D.famous 5A.sobs B.laughter C.cheers D.applause 6A.deaf B・blind C.lamb D.dead 7A.erase B・collect C.store D.honor 8A.mourning B.respect C.anxiety D.worry 9A.wentthrough B.cameto C.lookedfor D.gotby 10A.feeds B.attracts C.serves D.fills 11A.quietly B.regretflly C.proudly D.gladly 12A.expected B.appreciated C.announced D.accepted 13A.relief B.peace C.health D.satisfaction 14A.back B.off C.forward D.up 15A.day B.business C.success D.way 16A.achievements B.fortunes C.blessings D.romances 17A.leaving B.working C.buying D.wishing 18A.right B.desire C.chance D.courage 19A.smart B.sweet C.heroic D.polite 20A.stop B.lead C.wind D.cross
ThefirstThursdayinMayisWorldPasswordDaybutdon'tbuyacakeorsendcards.ComputerchipmakerIntelcreatedtheeventasanannualreminder.1F. Thepurposeofapasswordistolimitaccesstoinformation.Havingaverycommonorsimpleonelikeabcdeforevennormalwordslikepasswordisbarelyanysecurityatall.2E.Hackers'passwordcrackingtoolstakeadvantageofthislackofcreativityandgetinouraccountseasily.Moreexperienceduserswouldchoosealesscommonpassword.Howevertheymightstillfallvictimtocrackingsoftware. 3CAsecurepasswordisallthatstandsbetweenusandacybercriminal.Itshouldbeuniqueandcomplexwhichahackercan'teasilyguessorcrack.Thebestpasswordsaresupposedtobeatleast15characterslongandfullofrandomnumbersandletters.Howeveralongpasswordmeansacomplicatedprocesstologintoawebsite.4G.Youmaywanttowriteitdownbutitisnotsuggestedduetorisk. Thenwhatshouldwedo5B.YoucanchooseaphrasesuchasIwanttogotoEngland.Nextconvertittoanabbreviation缩略语byusingthefirstlettersofeachwordandchangingthewordtoto2.Thenyougetfollowingpasswordphraseiw2g2e.Youcanmakeitevenmorecomplexbyaddingpunctuationspacesorsymbols%iw_2g2e!@.Itismucheasiertorememberandsafer. Can'twaittotryLet'ssaygoodbyeto666666andchangeyourpasswordrightnow. A.Whatdonetworksecurityexpertsdo B.Tryusingshortenedphrasesforpasswords C.Howcanweensurethesafetyofapassword D.Changingpasswordregularlyisaneffectiveway E.Thatislikeclosingadoorbutnotactuallylockingit F.Itisusedtosayfarewelltopopularpasswordslike123456 G.Anditisalsodifficultforustorememberalongirregularpassword
DearDurhammers Durhamhasbeenyourhomeinthepastthreeyears.Thisisanappropriatemomentintimetoinviteyouasagroupoftouristsinthisspecialexploration.WewouldalsoliketocongratulateyouonyourforthcomingtransitionfrombeingaDurhammertoamemberofsociety.Pleaseseeinformationbelowonoffersandactivitiestoassistwithplanningyourcomingcelebrations. ViewdetailsofspecialoffersforWinterAssemblyat http://www.dur.ac.uk/ceremonies/congregation/offers/ ●SignuptokeepintouchwithDurhamUniversityandgetagoodybagsponsoredbytheALUMNIteam. ●20%discountonpre﹣orderedDurhamUniversityMerchandisewiththeticketcodeWGRADUATE2019Oryouhavetopaythefullpriceattheshop. ●Pre﹣orderyourphotographsandreceiveadiscountedrate. ●FreeentrytotheexhibitionsatPalaceGreenLibraryforyouandyourguestswithtickets. ●Purchaseadiplomacontainertokeepyourdegreecertificatesafe.Pleasecheck https∥www.dur.ac.uk/student.registry/qualifications/order/ ●DetailsofcelebrationeventsbeingheldinDepartmentsandCollegesarepublishedat https∥www.dur.ac.uk/ceremonies/congregation/celebrations/ InformationonthehighlightofthecelebrationincludingbutnotlimitedtotheopportunitytogooutforBBQandcampingatBotanticGardenispublishedat https∥www.dur.ac.uk/campusperks/whatsnewon/ceremonies/ Wealsohopeverymuchthatyouwillcomeandmeetusandcolleaguesattheceremonywhichisatraditionalandmagnificentpublicpresentationofyourdiplomaandawardanditisalwaysmemorableandfun.Youwillhavealreadyreceivedaformalemailinvitationbutthisisjusttosaythatwehopetomeetyouthereandcongratulateyouinperson. Yourssincerely SirThomasAllen 1WhoistheletterintendedforB A.Visitorsexploringthecampus. B.GraduatesfromDurhamUniversity. C.ColleaguesinDurhamUniversity. D.OrganizersoftheALUMNIGroup. 2Wherecanyoucheckdetailsoftheoff﹣campuscelebrationeventsD A.www.dur.ac.uk/ceremonies/congregation/offers/ B.www.dur.ac.uk/student.registry/qualifications/order/ C.www.dur.ac.uk/ceremonies/congregation/celebrations/ D.www.dur.ac.uk/campusperks/whatsnewon/ceremonies/ 3WhichofthefollowingitemsarefreeofchargeA A.Goodybags. B.Diplomacontainers. C.Pre﹣orderedphotographs. D.Librarycards.
下列有关巴氏芽孢杆菌的叙述正确的是A.巴氏芽孢杆菌有核膜B.巴氏芽孢杆菌含有染色体C.巴氏芽孢杆菌含有DNAD.巴氏芽孢杆菌无细胞器但能完成复杂的生命活动
下图为HIV和T4噬菌体结构示意图请据图判断下列说法正确的是 A.两种病毒都含有蛋白质不含有水B.两种病毒的宿主细胞相同C.两种病毒都能在细胞外独立生存D.HIV的宿主细胞是上呼吸道细胞和肺泡细胞
Everyyearabout75000GreatWhitePelicansflyawayfromEasternEurope'scoldwintertoEastAfricawheretheyspendthesummer.It'salongjourneyandthemainstopisinIsrael. TheGreatWhitePelicanisahugebird.It'sthelargestbirdintheworldtomakesuchalongjourney.Itsdietismainlyfishanditeatsabout1.4kiloseachday. Thepelicanslovetogatherinlargenumbers.Untilrecentyearstherewereplentyofwatersupplies供给inIsrael.FrequentlythepelicansarriveinIsraeltired.Theycannotcontinuetheirlongjourneyuntiltheyhaverested.Howeverforavarietyofreasonsthesewatersupplieshavedriedupandthepelicanshavehadtofindotherfoodsources. FishfarminghasbecomebigbusinessinIsrael.Asyoumayimagineafishfarmissomethingpelicanscouldusuallyonlydreamof!InthesummermonthswhentheGreatWhitePelicanspassedthroughIsrael'sfishfarmersbegantolosetonsoffish.Somefarmswereevenforcedtoclosetheirbusiness.Somethinghadtobedone. TheIsraelMinistryofAgricultureconsideredtheproblemcarefully.Howcoulditstop75000hugepelicansfromarrivinginIsrael?Itdecidedthiswasnotpossible.Itchoseaplacewithaplentifulsupplyofwaterandprovidedmoneyforlocalfarmerstobuyfoodwhichtheyfedtothepelicans.Thepelicanssoonunderstoodthisandnowarriveattheplacetofeedandrest.Theynolongerhavetorelyonthefishfarmsforfood. It'sasolutionthatseemstohaveworked.AtonepointitlookedasiftheMinistrywouldstopthemoney.Onecriticism批评wasthatwithsomuchfoodthepelicanswouldneverleaveandwouldbecomeevenmoreexpensive.Howevertherewassuchoutcryfromenvironmentalistsandfarmersthatthemoneyremains. PerhapstheirlargenumbersinIsraelwillattractbirdwatchersfromallovertheworldtovisittheamazingsightandtourismcanbringnewincometothecountry. 1WhatcanwelearnaboutGreatWhitePelicans? A.Theyareloners. B.TheywinterinIsrael. C.Theyaregoodatlong﹣distanceflying. D.Theyreducetheirintakeduringtheirjourney. 2Whatproblemdidthefishfarmersface? A.Thepelicansdamagedthelocalenvironment. B.Theirfarmswereclosedbythegovernment. C.Thewatersupplieswerenotenough. D.Theysufferedaheavylossoffish. 3Whatmeasuresdidthegovernmenttake? A.TheypreventedthepelicansstoppinginIsrael. B.Theyencouragedfarmerstodeveloptourism. C.Theygavefarmersmoneytofarmmorefish. D.Theyfoundanewplaceforthepelicans. 4Whatistheauthor'sattitudetothepelicansinIsrael? A.Optimistic. B.Unclear. C.Doubtful. D.Unconcerned.
关于蓝藻的说法不正确的是
Evenforafirst﹣timevisitortoChinaitisimpossibletoignorethepopularityofQuick﹣ResponseQRcodes.Thesesquare﹣shapedblack﹣and﹣whitesymbolsinWeChatorAlipaywhereQRcodesarescannedtoaddnewfriendsormakepayments. TheQRCodesystemoriginatedinJapan.TheengineerMasahiroHarafeltthelimitationoftheone﹣dimensionbarcodeinuseandthusdevelopedtheQRcodeswhichcouldcarrydatahorizontallyandvertically.QRcodescouldholdmuchmoreinformationthanbarcodeduetotheirextradimension.InadditionQRcodeshavelargerdatacapacitysmallerprint﹣outsizeandhigherresistancetodirtanddamagewhichmakethemwidelyappliedinmanyotherapplications. ThoughthetechnologyofQRcodesiscomplicatedwecaneasilycreateourownQRcodeswiththehelpofQRcodegeneratorsmanyofwhichareavailableonlineforfree.UserscouldenterthedatatheywishtheQRcodetodisplayandthegeneratorturnsitintoasymbolthatcanbeprintedordisplayedinelectronicform.TheprocessofcreatingQRcodescouldbereallyfunwhenwecustomisethedesignofthecodesaccordingtoourspecificneeds.Forinstancewecanadjustthecoloraddalogoandcreatesocialoptionsetc.Moreoverdynamic动态的QRcodesarealsoavailable.TheyaremorevariousthanstandardQRcodesbecausetheyallowuserstoeditdataenteredpreviouslywhereasdatainstandardQRcodescannotbeeditedonceprinted.Plusdon'tlimityourQRcodetoonemobilescanner.Anyonecanscanyourcodewithanyreader.Alowerbarriertoentrymakessuccessmorelikelyforyouandtheuser. MeanwhilewemustalsorecognizethevulnerabilityofQRcodes.DuetoitseasyaccesscriminalscanstealsimplybyreplacingtheQRcodeswiththeirownroutingcashintotheirownbankaccounts.HenceweshouldallbecomemoreconscioustowardsvirtualmoneytransactionsthroughQRcodesandparticipateinadditionalsecuritymeasures. 1WhichofthefollowingisNOTafunctionofQRcodesB A.Datastorage. B.Scanningreader. C.Socialnetworking. D.Mobilepayment. 2Whyisbarcodementionedinparagraph2C A.Tointroducethemaintopic. B.Toshowtheauthor'sattitude. C.TohighlightthefeaturesofQRcodes. D.Toaddsomebackgroundknowledge. 3Whichofthefollowingbestexplainsvulnerabilityunderlinedinparagraph4B A.Threat. B.Weakness. C.Difficulty. D.Simplicity. 4WhichistrueaboutQRcodesaccordingtothetextD A.TheywerefirstusedinChina. B.Thegeneratorschargetheusersalot. C.DataeditingispossibleinprintedQRcodes. D.MorescanningdevicesareavailableinreadingQRcodes.
下列关于真核生物原核生物和病毒的叙述中有几项正确①乳酸菌青霉菌大肠杆菌都属于原核生物②乳酸菌酵母菌都含有核糖体和DNA③T2噬菌体一种病毒的繁殖只在宿主细胞中进行因为只有核糖体一种细胞器④细胞没有叶绿体就不能进行光合作用A.1项 B.2项 C.3项 D.4项
据新华网华盛顿2017年9月18日消息美国医学会杂质·内科学卷18日刊载的一项研究显示如果艾滋病病毒携带者在接受抗逆转录药物治疗时还吸烟那么他们死于肺癌的可能性比死于艾滋病的可能性会高出10倍左右.下列相关叙述正确的是A.艾滋病病毒在活细胞外能大量增殖B.艾滋病病毒仅含有核糖体这一种细胞器C.艾滋病病毒携带者在接受抗逆转录药物治疗时不需戒烟D.戒烟预防肺癌应成为护理艾滋病病毒携带者的重要措施
下列有关细胞的叙述正确的是A.病毒是一类具有细胞结构的生物B.蓝藻细胞具有细胞核且DNA分子呈环状C.人体所有细胞的形态结构相同D.最早的生命是具有细胞结构的单细胞生物
下列概念依次与图中abcd相对应的一组是 A.真核生物动物植物真菌 B.生物真核生物原核生物真菌C.系统生命系统生态系统群落 D.原核生物细菌蓝藻病毒
下列有关组成生物体化学元素的叙述正确的是A.碳元素在生物体中的含量一定是最多的B.动物和植物所含化学元素的种类和含量相同C.组成生物体的化学元素在自然界中很难找到D.CHON都是大量元素
请分析并回答问题1细菌细胞壁的主要成分是肽聚糖青霉素抑制肽聚糖的合成从而起到抑制细菌生长的作用.艾滋病病人能否通过注射青霉素抑制病毒的增殖为什么.2如图中表示在低倍显微镜视野中观察到的细胞请据图回答①图中将装片向方移动可将上图所示视野中细胞移到视野正中央.②用显微镜观察某标本时已知目镜的放大倍数为10×物镜的放大倍数为40×则物像的放大倍数为.A.长度宽度均放大400倍 B.面积放大了400倍C.长度或宽度放大40倍 D.标本的体积放大400倍
下列有关细胞学说说法正确的是A.德国科学家施莱登和施旺是发现了细胞并创立细胞学说B.细胞学说指出生物是由细胞及其产物构成并由细胞发育而来C.细胞通过分裂产生新细胞是对细胞学说的修正D.细胞学说揭示了细胞和生物体结构都具有统一性和多样性
下列关于系统的叙述正确的是A.病毒能够繁殖是最基本的生命系统B.系统是指彼此间相互作用相互依赖的组分有规律地结合而形成的整体C.生活在一定区域的所有生物构成生态系统D.生殖器官和营养器官构成植物的系统
Itisbecomingincreasinglyimportantforresearcherstocloselymonitorouroceanlife.HoweverobservingseacreaturesUpcloseisalmostimpossiblesincehumanpresencescaresthem.NowthankstoTheSoftRoboticFishalsoknownasSoFiresearchersmaybeabletokeepacloseeyeontheseacreatures. BuiltbyMITComputerScienceandArtificialIntelligenceLaboratoryCSAILthewhitere﹣mote﹣controlledrobotresemblestherealfishcompletewithatailthatwavesfromsidetoside.ThoughnotthefirstautonomousunderwatervehicleAUVcreatedtomonitortheoceanSoFiset﹣tlesmanyoftheproblemsthathaveblockedtheusefulnessofthepreviousrobotfish. PreviousAUVshavehadtobelinkedtoboatsbecauseradiofrequencycommunicationsdon'tworkwellunderwater.ToovercometheproblemDirectorofdieCSALLDanielaRusandherteamusedsoundwaves.ThetechnologycantravelgreaterdistancesallowingdiverstopilotSoFifromupto50feetaway. AlsolimitingtheusefulnessoftraditionalAUVsistheriskofcollision.Withtheoutsidemadeofsoftsilicone硅树脂rubberandflexibleplasticthatkeepsitsinbuiltelectronicsdrySoFiposesnosuchdanger.Collisionavoidanceoftenleadstounnecessarymovementsincetherobothastosettleforacollision﹣freepathsaysRus.Incontrastasoftrobotisnotonlymorelikelytosurviveacollisionbutalsocoulduseitasinformationtoformamoreworkablemovementplannexttimearound. DuringtestdivesSoFimovedalongsidetheoceanlifeatdepthsof50feetforupto40minutesatatimetakingphotosandmakingvideos.Theresearcherssaysometimesthefishwouldswima﹣longsidethestrange﹣lookingrobot﹣fishoutofcuriositywhileatothertimestheytooknonoticeofitsexistence. WhileSoFipresentlyonlyrecordsvideofutureversionswillincludesensors.Theresearchersalsohopetomakeitmoreautonomous.WeimaginesomedayitmighthelpusuncovermoresecretsfromtheamazingunderwaterworldthatweknowsolittleaboutsaysRus. 1WhatdoesthewaterthinkofSoFi? A.Itmakesoceancreaturedetectioneasier. B.ItisthefirstAUV. C.Itiscloselycontrolled. D.Itscaresseaanimalsaway. 2Accordingtopara3whichofthefollowingisture? A.Soundwavestravelfasterthanradio B.Soundwavesworkbetterthanradiounderwater. C.PreviousAUVsusesoundAvavestocommunicate. D.AboattravelsalongwithSoFionthewater. 3HowdoesSoFidealwithcollision? A.Itcanbenefitfaromitsinbuiltelectronics. B.Itcanavoidextramovement. C.Itcansmartlyadjustitsmovementplan. D.Itissetforacollision﹣freepath. 4WhatwillhappentoSoFiinthefuture? A.SoFicanrecordvideos. B.SoFiwillgoinvisible. C.SoFiwillbefreefromexternalcontroL D.SoFiwillbeequippedwithsmartdevices.
LiftEv'ryVoice LillianM.Whitlowwww.xlibris.com ﹩34.99hardcoverI﹩23.99softcoverI﹩3.99ebook LillianM.Whitlow'sLiftEv'ryVoiceisacollectionofshortbiographies传记ofseveralAfrican﹣AmericansinhistorywhohaveprovidedAmericawiththeirgreatgiftsinmusicsportsartliterary文学的workstheatreandotherfields. ItCamebyLoss BillMcCausland warm.xlibris.com ﹩34.99hardcoverI﹩23.99softcoverI﹩3.99ebook ItCamebyLossisastoryaboutPete.Gordonandhisstrugglesafterthedeathofhismotherthedisastrousdeathofhisfriendandhowhewasabletorisefromthesebadexperiences. TheMakingofaPhysician HarryL.GraberM.D.F.A.C.C. www.xlibriscom ﹩29.99hardcover﹩19.99softcoverI﹩3.99ebook Thisbookwaswrittentohelpreadersdevelopagreaterappreciationoftheirownenvironmentalexperiencesandconsiderthemasinfluencesinthedecision﹣makingoftheirlives.Ithasamessagetoencourageotherstopursue追求amedicalprofession职业. TheSpecialandtheOrdinaryDavidClapham www.iuniverse.com ﹩26.95hardcoverI﹩16.95softcoverI﹩3.99ebook TheSpecialandtheOrdinarysharestheunusualstoryoftwoyoungpeopleastheycomeofageandstepintothefutureeachwithadifferentideaonwhatitmeanstobetruetothemselves.iUniversegaveTheSpecialandtheOrdinarytheEditor'sChoiceaward. 1WhatcanwelearnaboutLiftEv'ryVoice? A.ItpresentsinfluentialAfrican﹣Americansinhistory. B.ItisaboutAmericancultureandsports. C.Itcentresonclassicalliterature. D.Itisamusician'sbiography. 2What'stheauthor'spurposeofwritingTheMakingofaPhysician? A.Toshowpeoplehowtomakerightdecisions. B.Tosharehisenvironmentalprotectionstories. C.Toencouragepeopletopracticemedicine. D.Todescribehislifeexperiences. 3WhichbookearnedtheEditor'sChoiceaward? A.LiftEv'ryVoice. B.ItCamebyLoss. C.TheMakingofaPhysician. D.TheSpecialandtheOrdinary.
IhavelearnedsomethingaboutmyselfsinceImovedfromLongIslandtoFloridathreeyearsago.EventhoughIownahomeinPortSt.LuciejustminutesfromtheoceananuncontrollableurgewellsuptoreturntoLongIslandevenasothersmaketheirwaysouth.IguessIamasnowbi俎stuckinreverse.InsteadofenjoyingFlorida'smildwintersIwillinglyendurethesevereweatheronLongIslandtheplaceIcalledhomefor65years. I'mlikeamigratorybirdthathaslostitssenseoftiminganddirectionmywingsflappingagainstseason. Sowhatmakesmeflyagainstthetideofsnowbirds?TheanswerhasalottodowithmyreluctancetogiveupthethingsthatdefinewhoIam.OnceIhearthatthetemperatureonLongIslandhasdippedintotherangeof40to50degreesIbegintolongforthesightandcracklingsoundofawoodfire.Ialsolongforthebrightdisplayo£colors﹣firstinthe£alltreesandtheninthelimitsaroundhomesandatRockefellerCenter.Floridiansdecoratetoobutcan'tcreatethespecialfeelofaNewEnglandwinter. IsupposethebiggestreasonwhyItelumistocelebratetheholidayswithpeopleIhaven'tseeninmonths.WhatcouldbebetterthansittingwithfamilyandfriendsforaThanksgivingturkeydinnerorwatchingneighbors'childrenexcitedlyopengiftsonChristmas?Eventhefirstsnowfallseemsspecial.Iespeciallyenjoyseeingabrightredbirdsettlingonasnow﹣coveredbranchMywifeandIspendwintersataretirementcommunityinRidgeandI'mgratefulthatIdon'thavetoshovel. WhilethesesimplepleasuresarenotuniquetoLongIslandtheyaresomeofthereasmiswhyIcomeback.Whosaysyoucan'tgohome? 1WhatdoestheunderlinedwordsnowbirdinParagraph1referto? A.Apersonspendingwinterinawarmerclimate. B.Abirdseenchieflyinwinter. C.Apersonpermanentlylivinginaforeigncountry. D.Abirdflyingtothesouthinwinter. 2What'sthedifferencebetweenFloridaandLongIsland? A.WintersinLongIslandaremilder. B.ThesnowbirdsinLongIslandarerarer. C.WeatherinLongIslandisseverer. D.LongIslandisnearertotheocean. 3WhatdidtheauthormissmostwhenhewasinFlorida? A.Thecoldtemporature. B.Thecolorfullightdisplay. C.Thefamilygathering. D.Thewinterlandscape. 4What'stheauthor'spurposeinwritingthetext? A.Topraisethebeautyandwarmthofhishometown. B.Todescribehisdreamtobeafreebird. C.Toexplainthereasonsformovingfromhishometown. D.Toexpresshisfeelingofmissinghishometown.
假定你是某国际学校的学生会__张强.为配合你校正在开展的体育运动周活动请你用英语写一封倡议书号召全校同学积极参加体育锻炼. 注意词数100左右开头和结尾己给出但不计入总词数. Dearschoolmates CouldIhaveyourattentionplease? Thanks.
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.每处错谋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. 删除把多余的词用斜线\划掉. 修改在错的词下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 YesterdaymyfnendMeyerandIwenttoacafeteriaclosetothatIlive.ItturnedouttobeoneofthemostunforgettableexperienceIhadeverhad. Smallalthoughitisthecafeteriaisverypopularinourarea.UponarrivingatthecrowdedcafeteriawespotalargesignhangingonthewallreadsWatchYourHatandOvercoat. Meyerdid.Hekeptturningalltimealmostchokingonhisfood.Ikeptoneatingwiththoughtofmyowncoatonthehook.FinalIcouldn'thelpbutsayYoustupidboystoptowatchingourcoats. I'monlywatchingminerepliedMeyer.Youhasbeengoneforoverhalfanhour.
Whatdoesitreallymeantobesuccessful? 1.Itisaboutbeingabletoliveahappylife. Ifyouwanttohaveasuccessfullifeherearethreethingsyouneedtofocuson. ©Believeinyourself Ifyoudon'tbelieveinyourselfhowdoyouexpectotherpeopleto?Whenyoubelieveinyourselfitfuels促进yourcreativityandyourmotivation动力todothings.AllsuccessfulpeoplefromGandhitoTeslabelievedinthemselves.2.Weallhavetotrustthatwehavetheabilitytoturntheimpossibleintothepossible. ©Knowyourintention 3itisimportanttohaveanunderstandingofyourintention.Ifyourintentionissimplyrootedinmoneyandfameyouarenevergoingtotrulyfeelsuccessful.Moneyandfameonlyservetheego自负anddon'tprovidetruefeelingsofsuccess.Foratrulysuccessfullifeyourintentionhastoberootedinyourpurposeandpassions热情.Whenyourintentionistoserveyourpurposemakeachangeintheworldandexpressyourtalentsyouwillfeeltruesuccessandsatisfaction. ©4 Successisallaroundyourightnow.Stoptotakeamomentandyou'llnoticetheamazingsuccessthatisalreadypresentinyourlife.5.Beingthankfulforthetiniestsuccessesinlifewillhelpyoutocreatemoreandmoresuccess. A.Realizeyouarealreadysuccessful B.Discoverthetruemeaningofsuccess C.Thisiswhatgavethemthedrivetosucceed D.Ifyouwanttocreateagoodlivingcondition E.Whenitcomestoachievinggreatnessinthislife F.Thatiswhenyouwillstarttofeeltrulysuccessful G.Successissomuchmorethanjustmoneyorfame
Foodwaterandshelter1bebasichumanneedsbutitisreportedthatthereare1.2billiononpeopleintheworldwithoutenoughhousing.Thismaychangethanks2arevolutionaryuseof3Dprinterstoconstructhouses. TechcompanyICONhasdevelopedamethodfor3createaone﹣floor60﹣square﹣meterhouseoutofcement水泥inadayfor﹩10000.Thisisasmallamountofboththetimeandcost4needtobuildasimilarconstructionusingtraditionalmethods.Thecompanyaim5bringthatcostdownto﹩4000perhouse.Atraditionalhousewouldbemuch6expensivethanthat.Theaffordabilityofthesehousesmakes7theymuchmoreaccessible可使用的tothosewholiveinpoorareas. ICONhasteamedupwithNewStoryanon﹣profit非营利的organization8focusesonfindinginternationalhousingsolutions.Togethertheywillstartbuildinghomesindevelopingcountries. Thistechnologyisan9amazesolutionforthosewhoareinneedofshelter.10isalsopossiblethat3D﹣printedhouseswillbecomecommoninrichercountriesinyearstocome.
假定你是李华你的朋友Daniel给你发邮件说他想在美国办个主题为'中国风'的摄影展他想来你的家乡收集素材.请给他回一封邮件内容包括1.表示欢迎2.提出建议3.安排接机.注意1.词数100左右2.可以适当增加细节以使行文连贯.
下列关于念珠藻的叙述中不正确的是A.不具有细胞壁 B.DNA分子呈环状C.没有核膜包被 D.其细胞质内只有核糖体一种细胞器
同一个装片在不同放大倍数的显微镜下观察效果不同下列相关叙述中不正确的是
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库