专题限时训练(二十六)[说明文型完形填空](限时：30分钟)(一)Thefindingscomefromastudyofnearly1,000USpeoplethatlookedatdiet,calorieintakeandbodymassindex(BMI)—ameasureofobesity.__1__isfoundthatthosewhoatechocolateafewtimesaweekwere,on__2__，slimmerthanthose__3__ateitoccasionally.Even__4__chocolateisloadedwithcalories,itcontainsingredients(成分)thatmayfavourweightloss__5__thanfatsynthesis,scientistsbelieve.__6__boostingcalorieintake,regularchocolateconsumptionwasrelatedtolowerBMIinthestudy,__7__ispublishedinArchivesofInternalMedicine.Thelinkremainedevenwhenotherfactors,likehow__8__exerciseindividualsdid,weretakeninto__9__.Anditappearsitishowoftenyoueatchocolatethatisimportant,ratherthanhowmuchofityoueat.The__10__foundnolinkwithquantityconsumed.__11__totheresearchers,thereisonlyonechanceinahundredthattheirfindingscouldbeexplainedbychancealone.LeadauthorDrBeatriceGolomb,fromtheUniversityofCaliforniaatSanDiego,said:“Ourfindingsappeartoaddtoabodyofinformationsuggestingthatthecompositionofcalories,notjustthenumberofthem,mattersfordeterminingtheirultimateimpactonweight.”Thisisnotthefirsttimescientists__12__thatchocolatemaybehealthyforus.Otherstudieshaveclaimedchocolatemaybegoodfortheheart.Consumptionofcertaintypesofchocolatehasbeenlinkedtosomefavourablechangesinbloodpressure,insulin(胰岛素)sensitivityandcholesterol(胆固醇)level.Andchocolate,__13__darkchocolate,doescontainantioxidants(抗氧化剂)whichcanhelptomopupharmfulfreeradicals—unstablechemicalsthatcandamageourcells.DrGolombandherteambelievethatantioxidantcompounds,calledcatechins(儿茶素),canimproveleanmusclemassandreduceweight—__14__studiesinrodentswouldsuggestthismightbeso.Mice__15__for15dayswithepicatechin(presentindarkchocolate)hadimprovedexerciseperformanceandobservablechangestotheirmusclecomposition.Theysayclinicaltrialsarenowneededinhumanstosee__16__thisisthecase.Butbeforeyoureach__17__achocolatebar,therearestilllotsofunansweredquestions.Andintheabsenceofconclusiveevidence,expertsadvisecaution.Whilethere'snoharminallowingyourselfatreatlike__18__nowandagain,eatingtoomuchmightbeharmfulbecauseitoften__19__alotofsugarandfattoo.Andifyouarelookingtochangeyourdiet,youare__20__tobenefitmostfromeatingmorefreshfruitsandvegetables.1．A.AsB．ItC．WhichD．What2．A.wholeB．averageC．generalD．short3．A.whoB．thatC．whichD．why4．A.thoughB．soC．butD．or5．A.otherB．ratherC．lessD．more6．A.ThoughB．EvenifC．WhenD．Despite7．A.thatB．whichC．whereD．when8．A.muchB．oftenC．longD．many9．A.thoughtB．mindC．accountD．effect10．A.newsB．reportC．studyD．book11．A.AccordingB．BasedC．ReplyD．Response12．A.hadsuggestedB．suggestedC．havesuggestedD．suggest13．A.speciallyB．particularlyC．luckilyD．unfortunately14．A.atleastB．atmostC．infactD．byaccident15．A.feedingB．fedC．tofeedD．feed16．A.ifB．whatC．whyD．that17．A.outB．forC．withD．into18．A.noodlesB．chocolateC．riceD．nuts19．A.includesB．takesC．absorbsD．contains20．A.probableB．possibleC．likelyD．about(二)AsurveydonebytheUniversityofMichiganshowsabigdropinthenumberofteenagerswhosaytheysmokecigarettes.Inthe__1__，over44,000studentsingrades8,10and12，from424schoolsacrossthe__2__wereaskedabouttheirsmoking__3__.Theresultsshowthatsmokingamong8thgraders__4__from21percentin2002，to12percentin2007.Inthesame__5__，smokingdroppedfrom30%to21%among10thgradersandfrom37%to30%among12thgr...
