D

IntheUnitedStates,30percentoftheadult(成年人)populationhasa“weightproblem”.Tomanypeople,thecaseisclear:weeattoomuch.Butscientificevidence(证据)doeslittletosupporttheidea.GoingbacktotheAmericaof1910,wefindthatpeoplewerethinnerthantoday.Yettheyatemorefood.Inthosedays,peopleworkedharderphysically,

walkedmore,usedmachinesmuchless,anddidn’twatchTV.

Severalmodernstudies,moreover,haveshownthatfatpeopledonoteatmoreonaverage(平均)thanthinnerpeople.Infact,someinvestigations(调查),suchasa1990studyof3,545Londonofficeworkers,showthatfatterpeopleeatlessthanslimmerpeople.

Studiesshowthatslimpeoplearemoreactivethanfatpeople.AstudybyaresearchgroupofStanfordUniversitySchoolofMedicinefoundthefollowinginterestingfacts:

Themorethemenran,themorefattheylost.

Themoretheyran,themoretheyate.

Thus,thosewhoranthemostatethemost,yetlostthegreatestamountofbodyfat.

53.WhatkindofphysicalproblemdomanyadultAmericanshave?

A.Theyaretoothin. B.Theyworktoohard.

C.Theyaretoofat. D.Theylosetoomuchfat.

54.Whichofthefollowingwordscantaketheplaceoftheword“slim”inthispassage?

A.poor B.thin C.healthy D.rich

55.ComparedwiththeadultAmericanpopulationtoday,theAmericansof1910______.

A.atemorefoodandhadmoreactivitiesB.atelessfoodbuthadmoreactivities

C.atelessfoodandhadlessphysicalactivitiesD.hadmoreweightproblems

56.Whathavemodernmedicalandscientificresearchesreportedtous?

A.Fatpeopleeatlessfoodandarelessactive.

B.Fatpeopleeatmorefoodthanslimpeoplebutarelessactive.

C.Fatpeopleeatmorefoodthanslimpeoplebutaremoreactive.

D.Thinpeoplerunless,buthavegreaterincreaseinfoodintake.