IntheUnitedStates，30percentofthegrown—uppopulationhasa“weight”problem.Tomanypeople，thecauseisclear：theyeattoomuch.Butscientificexperimentsdolittletosupportthisidea.GoingbacktotheA

　　IntheUnitedStates，30percentofthegrown—uppopulationhasa“weight”problem.Tomanypeople，thecauseisclear：theyeattoomuch.Butscientificexperimentsdolittletosupportthisidea.GoingbacktotheAmericaof1910wefindthatpeoplewerethinnerthantoday，yettheyatemorefood.Inthosedayspeopleworkedharderphysically，walkedmore，usedmachinesmuchless，anddidn’twatchtelevision.

　　Severalmodernstudies，besides，haveshownthatfatterpeopledonoteatmoreonaveragethanthinnerpeople.Infact，someresearchwork，suchasl970studyof3545LondonOfficeworkers，reportsthatfatpeopleeatlessthanthinnerpeopleontheaverage.

　　Studiesshowthatthinpeoplearemoreactivethanfatpeople.AstudybytheresearchgroupofSchoolofMedicineatStanfordUniversityfoundthefollowinginterestingfacts.Themoreamanran，thegreaterbodyfathelost.Themoreheran，thegreaterheneededforfood.Thus，thosewhoranthemostatethemost，yetlostthegreateramountofbodyfat.

　　1Whatkindofphysicalproblemdomanygrown-upAmericanshave?

　　A.Theyaretoothin.

　　B.Theyworktoohard.

　　C.Theyaretoofat.

　　D.Theylosetoomuchbodyfat.

　　2.Basedontheinformationgiveninthisarticle，supposethereare500Americans，abouthowmanyofthemwillhavea“weight”problem?

　　A.30 B.50 C.100 D.150

　　3.Whathavemodernmedicalandscientificresearchesreportedtous?

　　A.Fatpeopleeatlessfoodandarelessactive.

　　B.Fatpeopleeatmorefoodandaremoreactive.

　　C.Fatpeopleeatmorefoodbutlosegreateramountofbodyfat.

　　D.Thinpeoplerunlessbuteatmorefood.