单项选择题

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

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单项选择题What is the response of many educators to 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.

单项选择题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 anticipat