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2022北京重点校初二（下）期中英语汇编
阅读单选CD篇
一、阅读单选
（2022春·北京东城·八年级汇文中学校考期中）
Thetruthbehindsportsdrinks
Inthesummerof1965,theUniversityofFloridafootballcoachwasworriedaboutthestateofhisteam.After
atoughgame,hisplayershadlostalotofweightandhardlyneededtourinate(排尿).Hewantedtoknowwhy.
Dr.JamesRobertCade,akidney(肾脏)expertattheUniversity,steppedintohelpfindouttheanswer.With
toomuchexerciseathightemperatures,theplayersweresweatingsomuchthattheydidn’thaveenoughfluidsleft
intheirbodies.Theirbloodsugarandelectrolyte(电解质)levelsturnedouttobeverylow.
Dr.Cade’steamdecidedtomakeadrinktosolvethisproblem.Thescientistsstartedwithwater.Torestore
carbohydrates(碳水化合物),theyaddedsugar.Tobalanceelectrolytes,theyaddedsalt.However,thedrinktasted
sobadthatplayerskeptspittingitout.DrCade’swiferecommendedaddinglemonjuice.Thefootballteamstarted
drinkingitandwonallofitsfollowinggames.
Assportsdrinkshavebecomeanincreasinglypopulartypeofbeverage,“Areyougettingenough
electrolytes?”hassimilarlybecomeahotquestion.Electrolytesarenaturallyfoundinmanyfruitsandvegetables.
Throughabalanceddiet,thebodykeepselectrolytelevelsrightwheretheyshouldbe.Butsometimesthebody
losesalotoffluidsreallyquickly.Whenthathappens,musclecramps(痉挛),tirednessandotherunpleasant
feelingsmayfollow.Thenanincreaseofelectrolytescanhelpthebodygetbacktonormal.
Manypeoplethinkthatsportsdrinkswingamesandmakeushealthyinasecond.Butthefactismostofusare
notprofessionalplayerstraininginextremeheat.Wedon’tlose10poundsofsweatinonegame.Mostpeople,even
thosewhoplaysports,donotusuallyhaveelectrolyte
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