单项选择题

The phrase "token economies" ( Para. 5, Line 1 ) 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
By ... challenges explanation ( Para. 1, Line 2) the author means that ______.
A．no explanation is necessary for such an obvious phenomenon
B．no explanation has been made up to now
C．it's no easy job to provide an adequate explanation
D．it's high time that an explanation was provided
单项选择题
What is the response of many educators to external rewards for their student
A．They have no doubts about them.
B．They have doubts about them.
C．They approve of them.
D．They avoid talking about them.
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