PALOAITOCalifornia—“Switchingoffthetelevisionmayhelppreventchildrenfromgettingfatter—eveniftheydonotchangetheirdietorincreasetheamounttheyexercise”USresearcherssaidlastweek.
Astudyof192thirdandfourthgradesgenerallyagedeightandninefoundthatchildrenwhocutthenumberofhoursspentwatchingtelevisiongainednearlytwopounds(0.91kg)lessoveraone-yearperiodthanthosewhodidnotchangetheirtelevisiondiet.
“Thefindingsareimportantbecausetheyshowthatweightlosscanonlybetheresultofareductionintelevisionviewingandnotanyotheractivity”saidThomasRobinsonapediatrician(儿科专家)atStanfordUniversity.
“Americanchildrenspendanaverageofmorethanfourhoursperdaywatchingtelevisionandvideosorplayinggamesandratesofchildhoodbeingveryfathavedoubledoverthepast20years”Robinsonsaid.
InthestudypresentedthisweektothePediatricAcademicSocieties’annualmeetinginSanFranciscotheresearcherspersuadedabout100ofthestudentstoreducetheirtelevisionviewingbyone-quartertoone-third.
Childrenwatchingfewerhoursoftelevisionshowedasignificantlysmallerincreaseinwaistsizeandhadlessbodyfatthanotherstudentswhocontinuetheirnormaltelevisionviewingeventhoughneithergroupateaspecialdietnortookpartinanyextraexercise.
“Oneexplanationfortheweightlosscouldbethechildrenunstucktothetelevisionmaysimplyhavebeenmovingaroundandburningoffcalories”Robinsonsaid.
“Anotherreasonmightbeduetoeatingfewermealsinfrontofthetelevision.SomestudieshavesuggestedthateatinginfrontoftheTVencouragespeopletoeatmore”Robinsonadded.
56.Thepurposeofthefirsttwoparagraphsis______.
A.toreportthetimechildrenspendwatchingTV
B.toshowthatmoreTVtimeleadstogettingfatter
C.totellusthebestwaytoreduceweight
D.tointroducethebackgroundoftheresearch
57.AccordingtothepassagethetimeAmericanchildrenusuallyspendonwatchingTV____.
A.ismorethanfourhoursaday B.islessthanfourhoursaday
C.doubledinthelasttwentyyears D.ismorethanonanyotheractivities