IntheUnitedStates30percentoftheadultpopulationhasa“weightproblem.”Tomanypeoplethecauseisclear:weeattoomuch.Butscientificevidence(证据)doeslittletosupportthisidea.GoingbacktotheAmericaof1910wefindthatpeoplewerethinnerthantoday.Yettheyatemorefood.Inthosedayspeopleworkedharderphysicallywalkedmoreanddidn’twatchTVandusedmachinesmuchless.
Severalmodernstudiesmoreoverhaveshownthatfatterpeopledonoteatmoreonaveragethanthinnerpeople.Infactsomeinvestigations(调查)suchasa1979studyof3545Londonofficeworkersreportedthatfatpeopleeatlessthanslimmerpeople.
Studiesshowthatslimpeoplearemoreactivethanfatpeople.AstudybyaresearchgroupatStanfordUniversityofMedicinefoundthefollowinginterestingfacts.Themorethemenranthemorefattheylost.Themoretheyranthemoretheyate.Thusthosewhoranthemostatethemostyetlostthegreatestamountofbodyfat.
68.WhatkindofphysicalproblemdomanyadultAmericanshave?
A.Theyaretoothin B.Theyworktoohard
C.Theyaretoofat D.Theylosetoomuchbodyfat.
69.Whichofthefollowingwordscantaketheplaceofthewordsliminthetext?
A.poor B.thin C.rich D.healthy
70.Accordingtothepassageamong500Americangrown-upshowmanyhaveweightproblem?
A.30 B.50 C.100 D.150