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1、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,i
2、tcontainsingredients(成分)thatmayfavourweightloss__5__thanfatsynthesis,scientistsbelieve.__6__boostingcalorieintake,regularchocolateconsumptionwasrelatedtolowerBMIinthestudy,__7__ispublishedinArchivesofInternalMedicine.Thelinkremainedevenwhenotherfactors,likehow__8__exerciseindividualsdid,were
3、takeninto__9__.Anditappearsitishowoftenyoueatchocolatethatisimportant,ratherthanhowmuchofityoueat.The__10__foundnolinkwithquantityconsumed.__11__totheresearchers,thereisonlyonechanceinahundredthattheirfindingscouldbeexplainedbychancealone.LeadauthorDrBeatriceGolomb,fromtheUniversityofCalifor
4、niaatSanDiego,said:“Ourfindingsappeartoaddtoabodyofinformationsuggestingthatthecompositionofcalories,notjustthenumberofthem,mattersfordeterminingtheirultimateimpactonweight.”Thisisnotthefirsttimescientists__12__thatchocolatemaybehealthyforus.Otherstudieshaveclaimedchocolatemaybegoodforthehea
5、rt.Consumptionofcertaintypesofchocolatehasbeenlinkedtosomefavourablechangesinbloodpressure,insulin(胰岛素)sensitivityandcholesterol(胆固醇)level.Andchocolate,__13__darkchocolate,doescontainantioxidants(抗氧化剂)whichcanhelptomopupharmfulfreeradicals—unstablechemicalsthatcandamageourcells.DrGolombandhe
6、rteambelievethatantioxidantcompounds,calledcatechins(儿茶素),canimproveleanmusclemassandreduceweight—__14__studiesinrodentswouldsuggestthismightbeso.Mice__15__for15dayswithepicatechin(presentindarkchocolate)hadimprovedexerciseperformanceandobservablechangestotheirmusclecomposition.Theysayclinic
7、altrialsarenowneededinhumanstosee__16__thisisthecase.Butbeforeyoureach__17__achocolatebar,therearestilllotsofunansweredquestions.Andintheabsenceofconclusiveevidence,expertsadvisecaution.Whilethere'snoharminallowingyourselfatreatlike__18__nowandagai
