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
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.
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
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