阅读理解:
IntheUnitedStates30percentoftheadult(成年人)populationhasa“weightproblem”.Tomanypeoplethecauseisclear:weeattoomuch.Butscientificevidence(证据)doeslittletosupportthisidea.GoingbacktotheAmericaof1910wefindthatpeoplewerethinnerthantoday.Yettheyatemorefood.Inthosedayspeopleworkedharderphysicallywalkedmoreusedmachinesmuchlessanddidn'twatchTV.
Severalmodernstudiesmoreoverhaveshownthatfatterpeopledonoteatmoreonaverage(平均地)thanthinnerpeople.Infactsomeinvestigations(调查)suchasa1979studyof3545Londonofficeworkersreportsthatfatpeopleeatlessthanslimmerpeople.
Studiesshowthatslimpeoplearemoreactivethanfatpeople.AstudybyaresearchgroupatStandfordUniversitySchoolofMedicinefoundthefollowinginterestingfacts:
Themorethemenranthemorefattheylost.Themoretheyranthemoretheyate.Thusthosewhoranthemostatethemostyetlostthegreatestamountofbodyfat.
1.WhatkindofphysicalproblemdomanyadultAmericanshave?
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A.Theyaretoothin.
B.Theyworktoohard.
C.Theyaretoofat.
D.Theylosetoomuchbodyfat.
2.Accordingtotheinformationgiveninthepassageamong500Americanshowmanyhaveweightproblem?
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A.30.
B.50.
C.100.
D.150.
3.Whichofthefollowingwordscantaketheplaceoftheword“slim”inthispassage?
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A.Poor.
B.Thin.
C.Healthy.
D.Rich.
4.ComparedwiththeadultAmericanpopulationtodaytheAmericansof1910________.
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A.atemorefoodandhadmorephysicalactivities
B.atelessfoodbuthadmoreactivities
C.atelessandhadlessphysicalexercise
D.hadmoreweightproblems