2015届高考英语第一轮阅读理解复习学案33

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1、安徽省安庆市第一中学2015高考英语阅读理解一轮巩固训练（5）答案阅读理解---科普常识类阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。Belowisaselectionfromapopularsciencebook.Ifbloodisred，whyareveins(静脉)blue?Actually，veinsarenotblueatall.Theyaremoreofaclear，yellowishcolour.Althoughbloodlooksredwhenit'soutsidethebody，whenit'ssittingina

2、veinnearthesurfaceoftheskin，it'smoreofadarkreddishpurplecolour.Attherightdepth，thesebloodfilledveinsreflectlessredlightthanthesurroundingskin，makingthemlookbluebycomparison.Whichworksharder，yourheartoryourbrain?Thatkindofdependsonwhetheryou'rebusythinkingorbusyexercising.Yourheartwor

3、ksuptothreetimesharderduringexercise，andshiftsenoughbloodoveralifetimetofillasupertanker.But，inthelongrun，yourbrainprobablytipsit，becauseevenwhenyou'resittingstillyourbrainisusingtwiceasmuchenergyasyourheart，andittakesfourtofivetimesasmuchbloodtofeedit.Whydoteethfallout，andwhydon'tth

4、eygrowbackingrownups?Baby(or“milk”)teethdonotlastlong；theyfallouttomakeroomforbigger，strongeradultteethlateron.Adultteethfalloutwhentheybecomedamaged，decayedandinfectedbybacteria.Oncethissecondsetofteethhasgrownin，you'redone.Whenthey'regone，they'regone.Thisisbecausenaturefiguresyou'r

5、esetforlife，andwhatcontrolsregrowthofyourteethswitchesoff.Dooldpeopleshrinkastheyage?Yesandno.Manypeopledogetshorterastheyage.But，whentheydo，itisn'tbecausethey'reshrinkingallover.Theysimplyloseheightastheirspine(脊柱)becomesshorterandmorecurvedduetodisuseandtheeffectsofgravity(重力)．Many

6、(butnotall)menandwomendoloseheightastheygetolder.Menloseanaverageof34cminheightastheyage，whilewomenmaylose5cmormore.Ifyoulivetobe200yearsold，wouldyoukeepshrinkingtillyouwere，like60cmtall，likealittleboyagain？No，becauseoldpeopledon'treallyshrink！Itisnotthattheyaregrowingbackwards—their

7、legs，armsandbackbonesgettingshorter.Whentheydogetshorter，it'sbecausethespinehasshortenedalittle.Or，moreoften，becomemorebentandcurved.Whydoesspinningmakeyoudizzy(眩晕的)?Becauseyourbraingetsconfusedbetweenwhatyou'reseeingandwhatyou'refeeling.Thebrainsensesthatyou'respinningusingspecialgr

8、avityandmoti