2019高考英语一轮题型练 Unit 1 Lifestyles（含解析）北师大版必修1

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1、Unit1Lifestyles一、阅读理解AIfyouwanttoslowaging,youmightwanttoeatless.Thisfindingisgoodnews---ifyouwereamouse.Theresearchersstudiedmice,notpeople.JohnPriceandotherresearchersstudiedtwogroupsofmice.Onegroupwasabletoeatasmuchasitwanted.Theresearcherslimitedwhatthe

2、miceintheothergroupate.Theirdiethad35percentfewercaloriesthanthefirstgroupofmice.Pricesaysthemicewiththedietrestrictionswere“moreenergeticandsufferedfewerdisease.”Theywerenotjustlivinglongerbutseemedtostayyoungerforalongerperiodoftime.Theresearchersfoundtha

3、tfewercaloriesslowdownanaturalmechanismincellscalledribosomes.Priceexplainsthatribosomesareresponsibleformakingimportantproteinsinthecells.Butwithfewercalories,theyslowdown.Thisgivesthecellsmoretimetorepairthemselves.Theresearcherssayribosomesusefrom10to20p

4、ercentofthecell’senergytomakethoseproteins.Pricewrotethat“becauseofthis,itisimpracticaltodestroyanentireribosome”whenitstartstobreakdown.However,“repairingindividualpartsoftheribosomeonaregularbasisenablesribosomestocontinueproducinghighqualityproteinsforlo

5、ngerthantheywouldotherwise.Thistopqualityproduction,inturn,keepscellsandtheentirebodyfunctioningwell.”Pricesaid,“ribosomeisaveryplexmachine,likeacar.”Theyneed“maintenancetoreplacethepartsthatwearoutthefastest.Whentireswearout,”heexplained,“youdon’tthrowthew

6、holecarawayandbuyanewone.Itcostslesstoreplacetheoldtires.”“Food,”hesaid,“isn’tjustmaterialtobeburned---it’sasignalthattellsourbodyandcellshowtorespond.”Pricesaidthefindingshelptoexplainhowexactlyourbodiesage.Andthismay“helpusmakemoreeducateddecisionsaboutwh

7、atweeat.”1.Whatcanweknowaboutthemicewithlimitedcaloriesfromthestudy?A.TheycankeephealthyeasilyB.TheyneedmoreenergytobeactiveC.TheycanlookyoungerthantheyareD.Theywilllivealongerlifelikehumans2.Whatwillhappentoribosomesiftherearefewercalories?A.Theywillpletel

8、ybreakdownB.TheymakeproteinsinthecellsslowlyC.TheywillproducehighqualityproteinsmoreD.Theymayneedmoretimetorepairthemselves3.Priceexplainedtheribosomes’roleofrepairingthemselvesby_________.A.tellingast