(湖南省长沙市一中2011 届高三月考七)according to the surprising findings of a new study by u. s. investigators, chewing sugarless gum during class and while doing homework can have a positive effect on academic performance in teenagers.
study leader craig a. johnston of the children's nutrition research center at baylor college of medicine in houston, texas, and his colleagues studied more than 100 eighthgrade students, 52 girls and 56 boys, aged between 13 and 16 years, in four math classes. the experts randomly(任意地) assigned teenagers into two groups: one group was asked to chew wrigley's sugarfree gum during class, while doing homework, and also while performing a standardized test. they chewed at least one stick of资源难易程度:★★★★★★★★★★★★★★★
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