题目内容：
根据以下材料，回答题
TheDrinkYourBodyNeedsMost
1.Ourbodiesareestimatedtobeabout60%to70%water.Bloodismostlywaterandourmuscles,lungs,andbrainallcontainalotofwater.Waterisneededtoregulatebodytemperatureandtoprovidethemeansfornutrients(滋养物)totraveltoallourorgans.Wateralsotransportsoxygentoourcells,removeswaste,andprotectsourjointsandorgans.
2.Welosewaterthroughurination(排尿),respiration(呼吸),andbysweating.Ifyouareveryactive,youlosemorewaterthanifyoudonottakemuchexercise.Symptomsofmilddehydration(脱水)includechronicpainsinjointsandmuscles,lowerbackpain,headaches,andconstipation(便秘).Astrongsmelltoyoururine,alongwithayellowcolorindicatesthatyouarenotgettingenoughwater.Thirstisallobvioussignofdehydrationandinfact,youneedwaterlongbeforeyoufeelthirsty.
3.Agoodruleofthumb(好的做法)istotakeyourbodyweightinpoundsanddividethatnumberinhalf.Thatgivesyouthenumberofounces(盎司)ofwaterperdaythatyouneed.
Forexample,ifyouweigh160pounds,youshoulddrinkatleast80ouncesofwaterperday.
Ifyouexerciseyoushoulddrinkanother8-ounceglassofwaterforevery20minutesyouareactive.Ifyoudrinkcoffeeoralcohol,youshouldaddatleastanequalamountofwater.Whenyouaretravelingonanairplane,itisgoodtohave8ouncesofwaterforeveryhouryouareonboardtheplane.
4.Itmaybedifficulttodrinkenoughwateronabusyday.Besureyouhavewaterhandyatalltimesbykeepingabottleforwaterwithyouwhenyouareworking,traveling,orexercising.Ifyougetboredwithplainwater,addabitoflemonforatouchofflavor.Therearesomebrandsofflavoredwateravailable,butsomeofthemhavesugarorartificialsweetenersthatyoudon'tneed.
Paragraph1__________ A．Ouncesofwaterneededperday
B．Importanceofwater
C．Compositionofwater
D．Signsofdehydration
E．Supplyofwater
F．Necessityforbringingabottleforwater
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