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时间:2019-10-27
《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》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、【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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