Passage Four
　　Questions 66 to 70 are based on the following passage:
　　Psychologists take opposing views of how external rewards, from warm praise to cold cash, affect motivation and creativity. Behaviorists, who study there relation between actions and their consequences, argue that rewards　can improve performance at work and school. Cognitive researchers, who study various aspects of mental life, maintain that rewards often destroy creativity by encouraging dependence on approval and gifts from others. 　　The latter view has gained many supporters, especially among educators. But the careful use of small monetary rewards sparks creativity in grade-school children, suggesting that properly presented inducements indeed aid inventiveness, according to a study in the June Journal of Personality and Social Psychology. 　　"If kids know theyre working for a reward and can focus on a relatively challenging task, they show the most creativity," say Robert Eisenberger of the University of Delaware in Newark. "But its easy to kill creativity by giving rewards for poor performance or creating too much anticipation for rewards." 　　A teacher who continually draws attention to rewards or who hands out high grades for ordinary achievement　ends up with uninspired students, Eisenberger holds. As an example of the latter point, he notes growing efforts at major universities to tighten grading standards and restore failing grades. 　　In earlier grades, the use of so-called token economies, in which students handle challenging problems and receive performance-based points toward valued rewards, shows promise in raising effort and creativity, the　Delaware psychologist claims.
　　66. Psychologists are divided with regard to their attitudes toward ______.
　　A) the choice between spiritual encouragement and monetary rewards
　　B) the amount of monetary rewards for student creativity
　　C) the study of relationship between actions and their consequences
　　D) the effects of external rewards on students performance

　　67. What is the response of many educators the external rewards for their students?
　　A) They have no doubts about them.
　　B) They have doubts about them.
　　C) They approve of them.
　　D) They avoid talking about them.

　　68. Which of the following can best raise students creativity according to Robert Eisenberger?
　　A) Assigning them tasks they have not dealt with before.
　　B) Assigning them tasks which require inventiveness.
　　C) Giving them rewards they really deserve.
　　D) Giving them rewards they anticipate.

　　69. It can be inferred from the passage that major universities are trying to tighten their grading standards because they believe _______.
　　A) rewarding poor performance may kill the creativity of students
　　B) punishment is more effective than rewarding
　　C) failing uninspired students helps improve their overall academic standards
　　D) discouraging the students anticipation for easy rewards is a matter of urgency

　　70. The phrase "token economies"(Line 1, Para. 5)probably refers to ______.
　　A) ways to develop economy
　　B) systems of rewarding students
　　C) approaches to solving problems
　　D) methods of improving performance