2021年高考英語(yǔ)拉分題專項(xiàng)訓(xùn)練(選修六)-專題28-A-healthy-life(練習(xí)部分)

Ahealthylife閱讀理解Belowisaselectionfromapopularsciencebook.Ifbloodisred,whyareveins(靜脈)blue?Actually,veinsarenotblueatall.Theyaremoreofaclear,yellowishcolor.Althoughbloodlooksredwhenit'soutsidethebody,whenit'ssittinginaveinnearthesurfaceoftheskin,it'smoreofadarkreddishpurplecolor.Attherightdepth,theseblood-filledveinsreflectlessredlightthanthesurroundingskin,makingthemlookbluebycomparison.Whichworksharder,yourheartoryourbrain?Thatkindofdependsonwhetheryouarebusythinkingorbusyexercising.Yourheartworksuptothreetimesharderduringexercise,andshiftsenoughbloodoveralifetimetofillasupertanker.But,inthelongrun,yourbrainprobablytipsit,becauseevenwhenyou’resittingstillyourbrainisusingtwiceasmuchenergyasyourheart,andittakesfourtofivetunesasmuchbloodtofeedit.Whydoteethfallout,andwhydon'ttheygrowbackingrown-ups?Baby(or"milk")teethdonotlastlong;theyfallouttomakeroomforbigger,strongeradultteethlateron.Adultteethfalloutwhentheybecomedamaged,decayedandinfectedbybacteria.Oncethissecondsetofteethhasgrownin,you'redone.Whenthey'regone,they’regone.Thisisbecausenaturefiguresyou'resetforlife,andwhatcontrolsregrowthofyourteethswitchesoff.Dooldpeopleshrinkastheyage?Yesanddo.Manypeopledogetshorterastheyage.But,whentheydo,itisn'tbecausethey'reshrinkingallover.Theysimplyloseheightastheirspine(脊柱)becomesshorterandmorecurvedduetodisuseandtheeffects,ofgravity(重力).Many(butnotall)menandwomendoloseheightastheygetolder.Menloseanaverageof3-4cminheightastheyage,whilewomenmaylose5cmormore.Ifyoulivetobe200yearsold,wouldyoukeepshrinkingtillyouwere,like60cmtall,likealittleboyagain?No,becauseoldpeopledon'treallyshrink!Itisnotthattheyaregrowingbackwards一theirlegs,armsandbackbonesgettingshorter.Whentheydogetshorter,it'sbecausethespinehasshortenedalittle.Or,moreoften,becomemorebaitandcurved.Whydoesspinningmakeyoudizzy(眩暈的)?Becauseyourbraingetsconfusedbetweenwhatyou'reseeingandwhatyou'refeeling.Thebrainsensesthatyou’respinningusingspecialgravity-and-motion-sensingorgansinyourinnerear,whichworktogetherwithyoureyestokeepyourvisionandbalancestable.Butwhenyousuddenlystopspinningthesystemgoesoutofcontrol,andyourbrainthinksyou'removingwhileyou'reDot!Wheredofeelingsandemotionscomefrom?Mostlyfromanancientpartofthebraincalledthelimbicsystem.Allmammalshavethisbrainarea—frommicetodogs,cats,andhumans.Soallmammalsfeelbasicemotionslikefear,painandpleasure.Butsincehumanfeelingsalsoinvolveother,newerbitsofthebrain,wefeelmorecomplexemotionsthananyotheranimalontheplanet.Ifexercisewearsyouout,howcanitbegoodforyou?Becauseourbodiesadapttoeverythingwedotothem.Andasfarasyourbodyisconcerned,it’s"useit,orlostit”!It'snotthatexercisemakesyouhealthy;it'smorethatalackofexerciseleavesyourbodyweakandeasilyaffectedbydisease.46.Whatisthecolorofbloodinaveinnearthesurfaceoftheskin?A.Blue. B.Lightyellow.C.Red. D.Darkreddishpurple.47.Whydosomeoldpeoplelookalittleshrunkenastheyage?A.Becausetheirspineisinactiveuse.B.Becausetheyaremoreeasilyaffectedbygravity.C.Becausetheykeepgrowingbackwards.D.Becausetheirspinebecomesmorebent.48.Whichofthefollowingstatementsaboutourbrainistrue?A.Inthelongrun,ourbrainprobablyworksharderthanourheart.B.Whenourbrainsensesthespinning,wewillfelldizzy.C.Thebrainsoftheothermammalsareascomplexasthoseofhumans.D.Ourfeelingsandemotionscomefromthemostdevelopedareainourbrain.49.Whatisthemainpurposeoftheselection?A.Togiveadviceonhowtostayhealthy.B.Toprovideinformationaboutourbody.C.Tochallengenewfindingsinmedicalresearch.D.Toreportthelatestdiscoveriesinmedicalscience.完形填空ALeap（跳動(dòng)）toHonorLeapingonanarrowbalancebeam（平衡木）isnoteasy.ButLolaWalter,a13-year-oldgymnast,isanexpertatit.Toperfectherskills,Lola36forfourhoursaday,fivedaysaweek.AtthestatechampionshipsinMarch,shefinishedseventhoutof16girls.That’sespeciallyimpressive.37sheislegallyblind,bornwitharareconditionthatcauseshereyestoshiftconstantly.Sheoftenseesdoubleandcan’t38howfarawaythingsare.Whenshewaslittle,hermom39thateventhoughshecouldn’tsee40,shewasfearless.Sohermomsignedherupforgymnasticswhenshewasthree.Shelovedthe41rightawayandgymnasticsbecameherfavorite.Thoughlearninggymnasticshasbeenmore42forherthanforsomeofhertournaments,shehasneverquit.Shedoesn’tlether43stopherfromdoinganythingthatshewantsto.Shelikesthedeterminationittakestodothesport.Herbiggest44isthebalancebeam.Becauseshehasdoublevision,sheoftenseestobeams.Shemustusehersenseoftouchtohelpherduringherroutine.Sometimessheevencloseshereyes.“Youhaveto45yourmindthatit’lltakeyouwhereyouwanttogo.”saysLola.Tobeatop-levelgymnast,onemustbebrave.Thebeamisprobablythemost46foranyonebecauseit’sfourincheswide.Atthestatecompetition,Loladidn’tfall47thebeam.Infact,shegotan8.1outof10----herhighestscoreyet.Loladoesn’twanttobe48differentlyfromtheothergirlsonherteam.Atthecompetitions,thejudgesdon’tknowabouthervision49.Shedoesn’ttellthem,becauseshedoesn’tthinktheyneedtoknow.Hermomisamazedbyher50attitude.Lolaneverthinksabout51.Sheispresentlyatlevel7whilethehighestislevel10ingymnastics.Her52istoreachlevel9.Shesaysshewantstobeagymnasticscoachtopassdownwhatshe’slearnedtootherkids53shegrewup.Lolais54ofallherhardworkandsuccess.Shesaysithelpedherovercomeproblemsinherlifeoutsidegymnastics,too.Her55forothersis“justbelieveyourself”.36.A.runs B.teaches C.trains D.dances37.A.since B.unless C.after D.though38.A.tell B.guess C.assume D.predict39.A.suspected Bremembered C.imagined D.noticed40.A.deeply B.well C.ahead D.closely41.A.task B.sport C.event D.show42.A.boring B.enjoyable C.different D.unsatisfactory43.A.talent B.quality C.nature D.condition44.A.doubt B.advantage C.challenge D.program45.A.examine B.express C.open D.trust46.A.fearful B.harmful C.unfair D.inconvenient47.A.to B.on C.off D.against48.A.greeted B.treated C.served D.paid49.A.pains B.stresses C.injuries D.problems50.A