阅读理解.Sciencecan'texplainthepowerofpets,butmanystudieshaveshownthatthecompanyofpetscanhelplowerbloodpressure(血压)andraisechancesofrecoveringfromaheartattack,reducelonelinessandspreadall-roundgood

　　阅读理解. Sciencecan'texplainthepowerofpets,butmanystudieshaveshownthatthecompanyofpetscanhelp

　　lowerbloodpressure(血压)andraisechancesofrecoveringfromaheartattack,reducelonelinessandspread

　　all-roundgoodcheer.

　　Anyownerwilltallyouhowmuchjoyapetbrings.Forsome,ananimalprovidesmorecomfortthana

　　husband/wife.A2002studybyKarenAllenoftheStateUniversityofNewYorkmeasuredstress(紧张)levels

　　andbloodpressureinpeople-halfofthempetowners-whiletheyperformed5minutesofmentalarithmetic(算

　　术)orheldahandinicewater.Subjectscompletedthetasksalone,withahusband/wife,aclosefriendorwith

　　apet.Peoplewithpetsdiditbest.Thosetestedwiththeiranimalfriendshadsmallerchangeinbloodpressure

　　andreturnedmostquicklytobaselineheartrates.Withpetsintheroom,peoplealsomadefewermathmistakes

　　thanwhendoinginfrontofothercompanions.Itseemspeoplefeelmorerelaxed(放松)aroundpets,saysAllen,whothinksitmaybebecausepetsdon'tjudge.

　　Astudyreportedlastfallsuggeststhathavingapetdognotonlyraisesyourspiritsbutmayalsohavean

　　effectonyoureatinghabits.ResearchersatNorthwesternMemorialHospitalspentayearstudying36fatpeople

　　andtheirequallyfatdogsondiet-and-exerciseprograms;aseparategroupof56peoplewithoutpetswereput

　　onadietprogram.Onaverage,peoplelostaboutI1pounds,or5%oftheirbodyweight.Theirdogsdideven

　　better,losinganaverageof12pounds,morethan15%oftheirbodyweight.Dogownersdidn'tloseanymore

　　weightthanthosewithoutdogsbut,sayresearchers,gotmoreexerciseoverall-mostlywiththeirdogs-and

　　founditworthdoing.1.Whatdoesthetextmainlydiscuss?[ ]A.Whatpetsbringtotheirowners.

　　B.Howpetshelppeoplecalmdown.

　　C.People'sopinionsofkeepingpets.

　　D.Pet'svalueinmedicalresearch.2.Welearnfromthetextthatapersonwithheartdiseasehasabetterchanceofgettingwellif_____.[