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高三英语试题：宁波市高三英语试卷阅读理解五
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Ifyou’retrainingforamarathon,aproperplanforwaterintake（摄入）isimportant．Ofcourse,there’stheriskofdehydration（脱水）．Butathletesnowknowtheycanalsogetintotroublebydrinkingtoomuch．Toomuchwaterintakecanlowerlevelsofsodium（钠）intheblood．Thedeathofa28-year-oldwomanfollowingtheBostonMarathoncaughttheattentionofmanyrunnersandledtonewresearch.
Expertsadviselongdistancerunnerstoreplacetheliquidstheysweatout．Theirgoalistotrytokeepsomeonefromnotgettingdehydratedbymorethan2percentoftheirbodyweight.
Onetechniquefordecidinghowmuchwateryouneedistogettheexactnumbers.Runnershavetoweighthemselvesbeforeandafteraruntodeterminehowmuchwaterthey’velost．Iftheirweightdropsbymorethan2percent,theyhavenotdrunkenoughwater.
Hyponatremiaoccurswhenrunnersdrinksomuchwaterthatbloodsaltlevelsdropoff．Astudypublishedlastyeartested488runnerswhocompletedtheBostonMarathonandfound13percentofthemhaddangerouslylowbloodsaltlevels．Thefirstsignthatrunnersmaynoticeisslightlyswellinginthehands．Theycan’tgettheirringsoff,andthentheymightfeelsick．Theymaynotrememberwheretheyare．Infact,mostrunnersgetenoughsalttogetbacktonormallevelsbyeatingjustonemealafterarun．Contrarytotheoldadvicethatrunnersshoulddrinkasmuchastheycantopreventdehydration,thenewresearchhasshownthatthebodyisaremarkablemachinethatactuallytellsyouviathirstwhenyouneedwater.
57.Theauthorofthispassageisprimarilyconcernedwith.
A.thesignsandtreatmentfordehydration
B.thelongdistancerunnerswhoneedhelp
C.howtomanagewaterintakeduringamarathon
D.a28-year-oldwomanwhodiedafteraBostonMarathon
58.Whydorunnershavetoweighthemselvesbeforeandafterarun?
A.Theycanimprovetheirperformanceinarun.
B.Theycanlearnhowmuchsaltthereisintheblood.
C.Theycanknowthequantityofwaterthey’velostduringarun.
D.Theycandecidewhatkindofwatertheyshouldtakeduringarun.
59.Whatconclusioncanwedrawfromthepassage?
A.Takingmuchsaltduringaruncanavoidswellinginthebody.
B.Eithertoomuchortoolittleofwaterintakeisharmful.
C.Arichmealishelpfultoourperformanceinarun.
D.Weshouldtakeenoughsaltduringarun.
60.Accordingthepassage,whichofthefollowingstatementsiscorrect?
A.Toomuchwaterintake→bloodsodiumlevelsfalls→dehydration.
B.Toomuchwaterintake→bloodsaltlevelsfalls→hyponatremia.
C.Nowaterintake→bloodsodiumlevelsrise→hyponatremia.
D.Nowaterintake→bloodsaltlevelsfalls→hyponatrenmia.
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