单选题：What kind of problem should be given to students to solve a

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题目内容：
What kind of problem should be given to students to solve according to Kapur? A．It should be able to encourage collaborative learning.
B．It should be easy enough so as not to frustrate students.
C．It should be solvable by average students with ease.
D．It should be difficult enough but still within their reach.

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