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时间:2019-11-15
《2019年高考英语一轮优练题 Unit 3 A healthy life(含解析)新人教版选修6》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Unit3Ahealthylife一、阅读理解。Ifyouwanttoslowaging,youmightwanttoeatless.Thisfindingisgoodnews---ifyouwereamouse.Theresearchersstudiedmice,notpeople.JohnPriceandotherresearchersstudiedtwogroupsofmice.Onegroupwasabletoeatasmuchasitwanted.Theresearcherslimitedwha
2、tthemiceintheothergroupate.Theirdiethad35percentfewercaloriesthanthefirstgroupofmice.Pricesaysthemicewiththedietrestrictionswere“moreenergeticandsufferedfewerdisease.”Theywerenotjustlivinglongerbutseemedtostayyoungerforalongerperiodoftime.Theresearchersfo
3、undthatfewercaloriesslowdownanaturalmechanismincellscalledribosomes.Priceexplainsthatribosomesareresponsibleformakingimportantproteinsinthecells.Butwithfewercalories,theyslowdown.Thisgivesthecellsmoretimetorepairthemselves.Theresearcherssayribosomesusefro
4、m10to20percentofthecell’senergytomakethoseproteins.Pricewrotethat“becauseofthis,itisimpracticaltodestroyanentireribosome”whenitstartstobreakdown.However,“repairingindividualpartsoftheribosomeonaregularbasisenablesribosomestocontinueproducinghighqualitypro
5、teinsforlongerthantheywouldotherwise.Thistopqualityproduction,inturn,keepscellsandtheentirebodyfunctioningwell.”Pricesaid,“ribosomeisaveryplexmachine,likeacar.”Theyneed“maintenancetoreplacethepartsthatwearoutthefastest.Whentireswearout,”heexplained,“youdo
6、n’tthrowthewholecarawayandbuyanewone.Itcostslesstoreplacetheoldtires.”“Food,”hesaid,“isn’tjustmaterialtobeburned---it’sasignalthattellsourbodyandcellshowtorespond.”Pricesaidthefindingshelptoexplainhowexactlyourbodiesage.Andthismay“helpusmakemoreeducatedde
7、cisionsaboutwhatweeat.”1.Whatcanweknowaboutthemicewithlimitedcaloriesfromthestudy?A.TheycankeephealthyeasilyB.TheyneedmoreenergytobeactiveC.TheycanlookyoungerthantheyareD.Theywilllivealongerlifelikehumans2.Whatwillhappentoribosomesiftherearefewercalories?
8、A.TheywillpletelybreakdownB.TheymakeproteinsinthecellsslowlyC.TheywillproducehighqualityproteinsmoreD.Theymayneedmoretimetorepairthemselves3.Priceexplainedtheribosomes’roleofrepairingthemselvesby_________.A.tellinga
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