2. 外语
  3. 　　Psychologists take contrastive views of how external rewards, from (31) praise to cold cash, affect motivation and creativity.

　　Psychologists take contrastive views of how external rewards, from (31) praise to cold cash, affect motivation and creativity.

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问题 　　Psychologists take contrastive views of how external rewards, from (31) praise to cold cash, affect motivation and creativity. Behaviorists, (32) research the relation (33) actions and their consequences argue that rewards can improve performance at work and school. Cognitive researchers, who study various aspects of mental life, maintain (34) rewards often destroy creativity (35) encouraging dependence (36) approval and gifts from others.
　　The latter view has gained many supporters, especially (37) educators. But the careful use of small monetary rewards sparks (38) in grade-school children, suggesting (39) properly presented inducements indeed aid inventiveness, (40) to a study in the June Journal of Personality and Social Psychology.
　　"If kids know they’re working for a (41) and can focus (42) a relatively challenging task, they show the most creativity", says Robert Eisenberger of the University of Delaware in Newark. "But it’s easy to kill creativity by giving rewards for (43) performance or creating too (44) anticipation for rewards".
　　A teacher (45) continually draws attention to rewards or who hands (46) high grades for ordinary achievement ends up (47) discouraged students, Eisenberger holds. (48) an example of the latter point, he notes growing efforts at major universities to tighten grading standards and restore failing (49).
　　In earlier grades, the use of so-called token economies, in (50) students handle challenging problems and receive performance-based points toward valued rewards, shows promise in raising effort and creativity, the Delaware psychologist claims.

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答案which
解析 此空后的句子应为定语从句，修饰"token economies"，故此空应填一个可引导定语从句的词，而且前面可加介词in。故答案为which。
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