题目内容：
心理学研究表明，动机强度与问题解决效果的关系可以描绘成（ ）。 A．波浪曲线
B．斜线
C．U型曲线
D．倒U型曲线
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答案解析：
单选题：心理学研究表明，动机强度与问题解决效果的关系可以描绘成（ ）。
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心理学研究表明，动机强度与问题解决效果的关系可以描绘成（ ）。 A．波浪曲线
B．斜线
C．U型曲线
D．倒U型曲线
心理学研究表明，动机强度与问题解决效果的关系可以描绘成（ ）。 A．波浪曲线
B．斜线
C．U型曲线
D．倒U型曲线
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