会的帮我下英语Nexttoair,wateristheelementmostnecessaryforsurvival.Anormaladultis60-70percentwater.Wecangowithoutfoodforalmosttwomonths,butwithoutwateronlyafewdays.Yetmostpeoplehavenoideahowmuchwatertheys

会的帮我下英语

Nexttoair,wateristheelementmostnecessaryforsurvival.Anormaladultis60-70percentwater.Wecangowithoutfoodforalmosttwomonths,butwithoutwateronlyafewdays.Yetmostpeoplehavenoideahowmuchwatertheyshoulddrink.Infact,manyliveinadehydrated(缺水的)state.

Withoutwater,we'dbepoisonedtodeathbyourownwasteproducts.Whenthekidneysremoveourbodywaste,thesemustbedissolvedinwater.Ifthereisn'tenoughwater,wastesarenotremovedaseffectivelyandmaybuildupaskidneystones.Wateralsoisvitalforchemicalreactionsindigestionandmetabolism(新陈代谢).Itcarriesnutrientsandoxygentothecellsthroughthebloodandhelpstocoolthebodythroughsweating.

Weevenneedwatertobreathe:ourlungsmustbemoisttotakeinoxygenandsendoutcarbondioxide.Itispossibletoloseapintofliquideachdaywhenwebreathe.

Soifyoudon'tdrinksufficientwater,youcanharmeveryaspectofyourphysiology(生理).Bynotdrinkingenoughwater,manypeoplehaveexcessbodyfat,poormuscletoneandsize,decreaseddigestiveefficiencyandorganfunction,increasedpoisonousstateinthebodyandmusclesoreness.

Toprotectyoufromtheseproblems,youaresupposedtofollowthefollowingformulafordailywaterintake:1/2ounceperpoundofbodyweightifyou'renotactive(that'steneight-ounceglassesifyouweigh160pounds),and2/3ounceperpoundifyou'reathletic(13to14glassesaday,atthesameweight).Yourwaterintakeshouldbespreadthroughoutthedayandevening.

26.Whatisthemostimportantthingforpeople'ssurvival?

A)Air.B)Water.C)FoodD)Medicine.

27.Waterisimportantindigestionbecause_____.

A)itdecreasesthepoisonoussubstancesinthebody

B)itdissolvesthewastesandcarriesalongthenutrients

C)itstrengthensourkidneyandstomach

D)itmakesthekidneymoist

28.Waterisimportantinbreathingbecause_____.

A)itcoolsthebodythroughsweatingB)itmoistensourlungs

C)itbringsintoourbodytheoxygenD)itcarriesthenutrientstoourlungs

29.Whichisnotmentionedasadamagecausedbynotdrinkingenoughwater?

A)Excessbodyfat.B)Paininmuscle.