吉林省四平市2014高考英语阅读理解巩固全程训练（14）及答案阅读理解Areyoupreparingforabigtest?Ifso,youmaywanttogoplaysomebasketballinbetweenhittingthebooks.Doctorsarestartingtofindmoreandmoreinformationthatsuggestsaconnectionbetweenexerciseandbraindevelopment.JudyCameron,ascientistatOregonHealthandScienceUniversity,studiesbraindevelopment.Accordingtoherresearch,itseemsthatexercisecanmakebloodvessels(血管),includingthoseinthebrain,strongerandmorefullydeveloped.DoctorCameronissurethatthisallowspeoplewhoexercisetothinkbetter.Asshesays,“whilewealreadyknowthatexerciseisgoodfortheheart,exercisecanactuallycausephysicalchangesinthebrain.”Theeffectsofexerciseonbraindevelopmentcanevenbeseeninbabies.Babieswhodoactivitiesthatrequiresalotofmovementandphysicalactivityshowgreaterbraindevelopmentthanbabieswhoarelessphysicallyactive.Evenalittlemovementcanshowbigresults.MargaretBarnes,ascientist,alsobelievesintheimportanceofexercise.Shethinksthatmanylearningdisabilitiesthatchildrenhaveinprimaryschoolorhighschoolcanresultfromalackofmovementasbabies.“Babiesneedmovementthatencouragesandexcitestheirfivesenses.Theyneedtosetupaconnectionbetweenmotionandmemory.Inthisway,astheygetolder,childrenwillbegintoconnectphysicalactivitywithhigherlearning,”saysMargaret.Olderpeoplecandeveloptheirbrainsaswell.CornellUniversitystudiedagroupofseniorswhohaveashort—termmemoryincreaseofupto40percentafterexercisingjustthreehoursaweek.Theexercisedoesnothavetobeverydifficult,butitdoeshavetoincreasetheheartrate.Also,justlikethemotionforbabies,exerciseforolderpeopleshouldnotbetoosimple.Learningsomenewskillsoractions,suchaswithyogaortai-chihelpstoopenupmemorypathsinthebrainthatmaynothavebeenusedforalongtime.Formostpeople,anytypeofphysicalactivitythatincreasestheheartrateishelpful.Themainaimistoincreasethebrain’sflowofblood.Andyourbraincanbenefitfromaslittleastwotothreehoursofexerciseaweek.1.Whatisthemainideaofthispassage?A.Howexercisemakespeoplestrong.B.Howtogetgoodscoresonatest.C.Howexercisehelpsthebrain.D.Howthebraincanchange.答案解析：答案