湖北黄冈市2016高考英语 阅读理解二轮精练3 含解析.doc

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1、湖北黄冈市2016高考英语阅读理解精练（3）及（解析）答案阅读下列四篇短文，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'ssittinginaveinnearthesurfaceofth

2、eskin，it'smoreofadarkreddishpurplecolour.Attherightdepth，thesebloodfilledveinsreflectlessredlightthanthesurroundingskin，makingthemlookbluebycomparison.Whichworksharder，yourheartoryourbrain?Thatkindofdependsonwhetheryou'rebusythinkingorbusyexercising.Yourheartworksuptothreetimesharderduring

3、exercise，andshiftsenoughbloodoveralifetimetofillasupertanker.But，inthelongrun，yourbrainprobablytipsit，becauseevenwhenyou'resittingstillyourbrainisusingtwiceasmuchenergyasyourheart，andittakesfourtofivetimesasmuchbloodtofeedit.Whydoteethfallout，andwhydon'ttheygrowbackingrownups?Baby(or“milk”

4、)teethdonotlastlong；theyfallouttomakeroomforbigger，strongeradultteethlateron.Adultteethfalloutwhentheybecomedamaged，decayedandinfectedbybacteria.Oncethissecondsetofteethhasgrownin，you'redone.Whenthey'regone，they'regone.Thisisbecausenaturefiguresyou'resetforlife，andwhatcontrolsregrowthofyou

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

6、er.Menloseanaverageof34cminheightastheyage，whilewomenmaylose5cmormore.Ifyoulivetobe200yearsold，wouldyoukeepshrinkingtillyouwere，like60cmtall，likealittleboyagain？No，becauseoldpeopledon'treallyshrink！Itisnotthattheyaregrowingbackwards—theirlegs，armsandbackbonesgettingshorter.Whentheydogetsho

7、rter，it'sbecausethespinehasshortenedalittle.Or，moreoften，becomemorebentandcurved.Whydoesspinningmakeyoudizzy(眩晕的)?Becauseyourbraingetsconfusedbetweenwhatyou'reseeingandwhatyou'refeeling.Thebrainsensesthatyou'respinningusingspecialgravityandmotionsensingorgansi