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1、重庆高考英语阅读、短文改错训练（1）答案（四月）阅读理解。WhylaughtermattersAlthoughmostpeoplebelievethatlaughterisoneofthenature'sgreattreatmentsforawholerangeofmentalandphysicaldiseases,itisstillaseriousscientificsubjectthatresearchersaretryingtofigureout.“Laughteraboveallelseisasocialthing,"saysBaltimoreneuroscient
2、ist,RobertProvine,whohasstudiedlaughterfordecades・“Alllaughtergroupslaugh'hahaha'basicallythesameway.WhetheryouspeakMandarin,FrenchorEnglish,everyonewillunderstandlaughter.Thereisapatterngenerator（发生器）inourbrainthatproducesthissound."Laughingisourfirstwayofcommunicating.Babieslaughlongbefo
3、retheyspeak.Nooneteachesthemhowtolaugh.Theyjustdo.Peoplemaylaughataprank（恶作屏）onAprilFools*Day.Butsurprisingly,only10to15percentoflaughteristheresultofsomeonemakingajoke・Laughterismostlyaboutsocialresponsesratherthantoajoke・Deafpeoplelaughwithouthearingandpeopleoncellphoneslaughwithoutseein
4、g,showingthatlaughterisn'tdependentonsinglesensebutonsocialinteractions.Andlaughterisnotjustathingofpeople.Chimpstickle（挠痒）eachotherandevenlaughwhenanotherchimppretendstoticklethem.JaakPanksepp,aBowlingGreenUniversityPsychologyprofessor,studiesratsthatlaughwhenheticklesthem.Itturnsoutratsl
5、ovetobetickled—theyreturnagainandagaintothehandsofresearchersticklingthem.Bystudyingrats,scientistscanfigureoutwhafsgoingoninthebrainduringlaughter.NorthwesternUniversitybiomedicalengineeringprofessor,JeffreyBurgdorfhasfoundthatlaughterinratsproducesachemicalthatactsasanantidepressant（抗抑有E
6、药）・Hethinksthesamethingprobablyhappensinhumans,too.Thiswouldgivedoctorsanewchemicaltargettodevelopdrugsthatcanfightdepression.Evenso,laughteritselfhasnotbeenprovedtobethebestmedicine,expertssay.MargaretStuber,aprofessoratUniversityofCalifornia,studiedwhetherlaugherhelpedpatients.Shefoundth
7、atdistraction（分心、）andmoodimprovementhelped,butshecouldnotfindabenefitoflaughteralone・“Nostudyhasshownthatlaughterproducesadirecthealthbenefit,"Provinesaid,largelybecauseifshardtoseparatelaughterfromjustfeelinggood.Buthethinksitdoesn'treallymatter,“Isn'tthefact
