2019高考英语一轮达标Unit2Cloning练题含解析新人教版选修8(含解析)117

2019高考英语一轮达标Unit2Cloning练题含解析新人教版选修8(含解析)117

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时间:2019-10-27

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1、【人教版】2019高考英语一轮达标试卷Unit2Cloning一、阅读理解.Ifyou'remakingdeterminationforahealthiernewyear,consideragutmakeover(肠道清理).Changingyourmicrobecommunity(微生物群),however,maynotbeeasy,andnobodyknowshowlongitmighttake.That'sbecausetheecosystemalreadyestablishedinyourgutdetermineshowitabsorbsandprocesse

2、snutrients.Soifthemicrobecommunityinyourguthasbeenshapedbyadailydietofhamburgersandpizza,forexample,itwon'trespondasquicklytoahealthydietasagutshapedbyvegetablesandfruitsthathasamorevariedmicrobecommunity.“Thenutritionalvalueoffoodisinfluencedinpartbythemicrobecommunitythatencounterstha

3、tfood,”saidDrJeffreyGordon,theseniorauthorofthenewpaperanddirectoroftheCenterforGenomeScienceandSystemsBiologyattheWashingtonUniversitySchoolofMedicineinSt.Louis.“Nutritionalcomponentsofahealthydiethavetobeviewedfromtheinsideout,”hesaid,“notjusttheoutsidein.”Oneofthequestionsthestudyset

4、outtoanswerwashowindividualswithdifferentdietsrespondwhentheytrytoimprovetheireatinghabits.Thescientistsharvestedgutbacteriafromhumans,transplantedthemintomicebredunder【人教版】2019届高考英语一轮达标卷:全一册练题【人教版】2019高考英语一轮达标试卷germfreeconditions,andthenfedthemiceeitherAmericanstyleorplantbaseddiets.Th

5、escientiststhenanalyzedchangesinthemice'smicrobecommunities.Ofinterest,thescientistsharvestedthegutbacteriafrompeoplewhofollowedsharplydifferentdiets.OnegroupateafairlytypicalAmericandiet,consumingabout3000caloriesaday,highinanimalproteinswithfewfruitsandvegetables.Someoftheirfavoritefo

6、odswereprocessedcheeseandlunchmeat.Theothergroupconsistedofpeoplewhowerecalorierestricted.Theyatelessthan1800caloriesadayandhadcarefullytrackedwhattheyateforatleasttwoyears,stickingtoamostlyplantbaseddietandconsumingfarlessanimalproteinthantheothergroup,athirdfewercarbohydrates(碳水化合物)an

7、donlyhalfthefat.Thiscalorierestrictedgroup,theresearchersfound,hadafarricherandmorediversemicrobecommunityinthegutthanthoseeatingatypicalAmericandiet.Theyalsocarriedseveralkindsof“good”bacteria,knowntopromotehealth,thatareuniquetotheirplantbaseddiet.“Perhapsthebestwaytoshapeahe

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