单项选择题
A.They have no doubts about them. B.They have doubts about them. C.They approve of them. D.They avoid talking about them.
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
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