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目前世界上有近20亿的人患有缺铁性贫血．这里的“铁”是指（ ）
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国际互联网上报道目前世界上有近20亿人患有缺铁性贫血这里的铁是指
铁单质
四氧化三铁
铁元素
三氧化二铁
目前世界上有近20亿的人患有缺铁性贫血这里的铁是指
铁元素
铁单质
氧化铁
铁合金
3.00分国际互联网上报道目前世界上有近20亿人患有缺铁性贫血．这里的铁是指
铁单质
铁元素
四氧化三铁
硫酸铁
据报道目前世界上有近20亿人患有缺铁性贫血这里的铁是指
铁元素
四氧化三铁
铁单质
氧化铁
互联网上报道目前世界上有近20亿人患有缺铁性贫血影响着人的身体健康和智力对孕妇和儿童危害尤其严重我国
铁元素
铁单质
氧化铁
四氧化三铁
国际互联网上报道目前世界上有近20亿人患有缺铁性贫血．这里的铁是指
铁单质
铁元素
四氧化三铁
硫酸铁
国际互联网上报道目前世界上约有20亿人患有缺铁性贫血这里的铁是指
四氧化三铁
铁单质
氧化铁
铁元素
国际互联网上报道目前世界上有近20亿人患有缺铁性贫血这里的铁是指
铁单质
铁元素
四氧化三铁
硫酸铁
国际互联网上报道目前世界上有近20亿人患有缺铁性贫血这里指的铁是
铁单质
铁元素
四氧化三铁
三氧化二铁
国际互联网上报道目前世界上有近20亿人患有缺铁性贫血．这里的铁是指
铁单质
铁元素
四氧化三铁
铁原子
国际互联网上报道目前世界上有近20亿人患有缺铁性贫血我国政府现已启动酱油补铁工程这里的铁指的是【】
铁元素
铁单质
四氧化三铁
硫酸铁
国际互联网上报道目前世界上约有20亿人患有缺铁性贫血这里的铁是指
四氧化三铁
铁单质
氧化铁
铁元素
国际互联网上报道目前世界上有近20亿的人患有缺铁性贫血这里铁指
铁单质
铁元素
四氧化三铁
三氧化二铁
国际互联网上报道目前世界上有近20亿人患有缺铁性贫血这里的铁指的是
铁元素
铁单质
四氧化三铁
三氧化二铁
互联网上报道目前世界上有近20亿人患有缺铁性贫血影响着人的身体健康和智力对孕妇和儿童危害尤其严重我国
氧化铁
四氧化三铁
铁单质
铁元素
.互联网上报道目前世界上有近20亿人患有缺铁性贫血这里的铁是指
铁单质
铁元素
铁离子
铁的化合物
国际互联网上报道目前世界上将近有20亿人患有缺铁性贫血这里的铁是指
铁元素
铁分子
铁原子
铁单质
国际互联网上报道目前世界上约有20亿人患有缺铁性贫血这里的铁是指
四氧化三铁
铁单质
氧化铁
铁元素
国际互联网上报道目前世界上有近20亿人患有缺铁性贫血.这里的铁是指
铁单质
铁元素
四氧化三铁
三氧化二铁
国际互联网上报道目前世界上近20亿人患有缺铁性贫血这里的铁是指
铁单质
铁元素
四氧化三铁
三氧化二铁
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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．
宇航员的航天服内充有气体若出舱前航天服内气体压强为p体积为V到达太空后气体体积变为2V温度不变此时航天服内的气体压强为．1965年3月18日苏联航天员列昂诺夫在返回飞船时遇到了意想不到的困难他的航天服有些向外膨胀很难从密封舱的接口处钻回舱内他启动了应急装置减小航天服的体积安全地回到密封舱内．你认为该应急装置可以如何减小航天服体积．
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
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．
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．
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．
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