A.a trailer
B.a truck
C.a pillow
D.a house
19.By saying “Doyouhaveapillow?”,
the writer's father means that________. sary
B.they should not waste money on small things
C.they should do more volunteer work for the poor
D.what he will buy is not what they want but a pillow
B
Two recent studies have found that punishment is not the best way to influence behavior.
One showed that adults are much more cooperative if they work in a system based on rewards. Researchers at Harvard University in the United States and the Stockholm School of Economics in Sweden did the study.
They had about two hundred college students play a version of the game known as the Prisoner's Dilemma. The game is based on the tension between the interests of an individual and a group. The students played in groups of four. Each player could win points for the group,
so they would all gain equally. But each player could also reward or punish each of the other three players,
at a cost to the punisher. Harvard researcher David Rand says the most successful behavior proved to be cooperation. The groups that rewarded it the most earned about twice as much in the game as the groups that rewarded it the least. And the more a group punished itself,
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