当我看到我的数学卷子上的分数时，我的下巴几乎掉到了地上。

When I looked at the grade on my math paper my jaw almost dropped to the ground.

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莉萨：没有，他只是给我一张数学卷子做。

Lisa: No, he just gave me a sheet of math problems to do.

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无纸考试系统理想的组卷方式是根据试题得分概率和答题时间概率分布自动组卷，使所组卷子的预期考试成绩和答题时间数学期望和方差符合要求。

A ideal exam-paper formation algorithm of a no-paper examination system automatically makes a exam-paper to meet pre-demands of exam-grade distribution and exam-time.

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