‘
ⅰ.阅读理解
a
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
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.
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