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1、第一部分选修六Unit3I.阅读理解
2、导学号01831088（2015-山东省威海市二模）Run,swim,liftweights,doyoga一dosomething,becauseifsgoodforyou.Manystudiestellusthatregularexercisenotonlyhelpsourbodiesbutimprovesmemory,andeasesanxiety.Butwhatishappeningtothemindduringworkouttocreateallthesebenefits?AnewstudyfromSwe
3、densuggeststhataspecificproteinfoundintrainedmusclesmightcontributetoexercise'smentalbenefits.Thisprotein,theresearchersfound,mighthelpourbodiesprocessmoleculesthat,ifoutofbalance,canstressusandcontributetodepression（萎靡不振）・ThefindingswerepublishedinthejournalCell.Totestthis,the
4、researcherskeptattackingsomemicewithflashinglights,loudnoisesandinterruptingtheirsleepforweeks・Predictably,thistreatmentmakesthemiceshowsignsandbiochemicalmarkersofdepression・Butnotallthemiceshowedthosesigns・Onegroup,speciallyraisedtohavehighlevelsofaproteincalledPGC-1alpha!（th
5、eoneintrainedmuscles）,didnotshowthosedepressionsigns.PGC-1alpha1increasesproductionofanenzymethatbreaksdownachemicalcalledkynurenine.Kynureninehelpsthebodyrespondtoanactivatedimmunesystem（活性免疫系统），butitalsoplaysaroleindepression."Ouroriginalresearchassumptionwasthattrainedmuscle
6、wouldproduceasubstanee（物质）withbeneficialeffectsonthebrain,”JorgeRuasoftheKarolinskaInstitutetoldForbes.com・"Weactuallyfoundtheopposite:well-trainedmuscleproducesanenzymethatremovesharmfulsubstancesawayfromthebody.”Thisstudywasinmice,butitlinesupnicelywithalltheotherlinesofevide
7、ncethatexerciseisgoodformentalhealth・文章大意：体育锻炼有益身心健康，但是我们的大脑在锻炼过程中发生了什么变化从而有益于我们的身心的呢？本文给出了答案：锻炼的肌肉中产生了一种enzyme物质，它带走了我们身体里的有害物质。1・Accordingtothestudy,whichofthefollowingisbadforyourmentalhealth?A.Protein.B・Molecule.C.Enzyme・D.Kynurenine.答案：D细节理解题。由第四段最后一句话t4...butitalsoplaysar
8、oleindepression.^^可矢n,Kynurenine会造成我们心情萎靡不振。该题易误选B项，由第二段倒数第二句话"moleculesthat,讦outofbalance,canstressusandcontributetodepression（萎靡不振）”可知，该物质本身无害，只有当它在身体内失衡时才有害，所以不选。2.Whatconclusionhavetheresearchersdrawnfromthestudy?A.Unbalancedexerciseleadsyoutodepression.B.Well-fedmicesurviv
9、ebetterthoughbeingill-treated.C.Trainedmuscleproducesa
