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1、2014高考英语完形填空巩固练习精品题（7）及答案【北京市2013高考模拟】DWhyLaughterMattersAlthoughmostpeoplebelievethatlaughterisoneofthenature’sgreattreatmentsforawholerangeofmentalandphysicaldiseases,itisstillaseriousscientificsubjectthatresearchersaretryingtofigureout.“Laughteraboveallelseisasocialthin
2、g,”saysBaltimoreneuroscientist,RobertProvine,whohasstudiedlaughterfordecades.“Alllaughtergroupslaugh‘ha-ha-ha’basicallythesameway.WhetheryouspeakMandarin,FrenchorEnglish,everyonewillunderstandlaughter.Thereisapatterngenerator(发生器)inourbrainthatproducesthissound.”Laughingis
3、ourfirstwayofcommunicating.Babieslaughlongbeforetheyspeak.Nooneteachesthemhowtolaugh.Theyjustdo.Peoplemaylaughataprank(恶作剧)onAprilFools’day.Butsurprisingly,only10to15percentoflaughteristheresultofsomeonemakingajoke.Laughterismostlyaboutsocialresponsesrathertoajoke.Deafpeop
4、lelaughwithouthearingandpeopleoncellphoneslaughwithoutseeing,showingthatlaughterisn’tdependentonsinglesensebutonsocialinteractions.Andlaughterisnotjustapeoplething.Chimpstickle(挠痒)eachotherandevenlaughwhenanotherchimppretendstoticklethem.JaakPanksepp,aBowlingGreenUniversit
5、yPsychologyprofessor,studiesratsthatlaughwhenheticklesthem.Itturnsoutratslovetobetickled—theyreturnagainandagaintothehandsofresearchersticklingthem.Bystudyingrats,scientistscanfigureoutwhat’sgoingoninthebrainduringlaughter.NorthwesternUniversitybiomedicalengineeringprofess
6、or,JeffreyBurgdorfhasfoundthatlaughterinratsproducesachemicalthatactsasanantidepressant(抗抑郁药).Hethinksthesamethingprobablyhappensinhumans,too.Thiswouldgivedoctorsanewchemicaltargettodevelopdrugsthatcanfightdepression.Evenso,laughteritselfhasnotbeenprovedtobethebestmedicine
7、,expertssaid.MargaretStuber,aprofessoratUniversityofCalifornia,studiedwhetheryearsmortgagehousing;4.mortgageregistrationformalitiesarecompleted.(D)pledge1.borrower(includingthepledgor)between18-65yearsofage,withfullcivilcapacity;2.collateral-9-laugherhelpedpatients.Shefoun
8、dthatdistraction(分心)andmoodimprovementhelped,butshecouldnotfindabenefitoflaughteralone.“N
