Researchers randomly assigned(分派)173 families to one of these groups. In one, parents used stickers to reward their children each time they took a tiny sample of a disliked vegetable. A second group of parents used verbal praise. The third group, where parents used no special vegetable-promoting methods, served as a “control”.
Parents in the reward groups offered their children a taste of the “target” vegetable every day of 12 days, Soon after, children in the sticker group were giving higher ratings to the vegetables-and were willing to eat more in the research lab, going from an average of 5 grams at the start to about 10 grams after the 12-day experience. The turnaround also seemed to last, with preschoolers in the sticker group still willing to eat more of the once disliked vegetable three months later.
Why didn’t the verbal praise work? Wardle said the parents’ words may have seemed “insincere” to their children.
16.The purpose of writing the passage is
.
A.to introduce a practical method of making children eat vegetables
B.to show the procedure of an experiment on children’s diet
C.to explain why children hate to eat vegetables
D.to present a proper way of vernal praise to parents
17.The underlined word “backfire” in Paragraph 2 probably means “
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