Donald was not very good at math.
  He could not understand the
teacher’s explanations.
  Even when the teacher explained something for a second
time, Donald still could not understand it.
  “Never mind,” Donald told himself. “I’m quite good

at other subjects. I’ll cheat in the math exam, and then I won’t be in trouble.”
  “I’ll sit next to the boy who’s best at math,” he thought, “and
copy down his answers.”
  The day of the exam came, and Donald sat next to Brian
Smith, who was always at the top of the class in math.
  Donald carefully copied Brian’s answers onto his own
exam paper.
  At the end of the exam, the teacher collected the papers
and graded them.
  Then she said, “Well, boys and girls, I’ve decided to give
a prize to the student who got the highest grade. It’s difficult for

me to decide who to give the prize to, however, because two
students, Donald and Brian, got the same grade.”
  “Let them share it,” one of the other students said.
  “I’ve thought about that,” the teacher said, “but I’ve decided
to give the prize to Brian.”
  Donald was angry when he heard this.
  He stood up and said, “That’s not fair. I got the same grade
as Brian.”
  “That’s true,” the teacher said. “However, Brian’s answer to
Question 18 was ‘I don’t know.’ Yours was ‘Neither do I.’”

                                   作 弊 者

  唐纳德数学学得不太好。
  他听不懂老师的讲解。
  即使老师又给他讲一遍，他还是听不懂。
  于是，他自我安慰说：“不要紧，其他学科我学得好。数学考试我可以
作弊，这样就不会不及格了。”
  他心理盘算着：“考试时，我就坐在数学成绩最好的同学旁边，抄他的
答案。”
  考试的那天，唐纳德坐在布莱恩·史密斯旁边。布莱恩·史密斯在班里
数学成绩总是名列前茅。
  唐纳德认真地把布莱恩的答案抄到他的试卷上。
  考试结束后，老师把试卷收上来，给每个同学打分。
  试卷批完后，老师向全班同学宣布：“同学们，我决定要奖励数学成绩
  最好的同学。然而，对我来说，很难下决定奖励谁，因为唐纳德和布莱恩两
位同学的分数一样。”
  一个同学说：“让他们二人共享这个奖励吧。”
  老师说：“我也想过这个办法，但还是决定奖励布莱恩。”
  听了老师的决定，唐纳德非常生气。
  他站起来说道：“这不公平，我和布莱恩的分数是一样的。”
  老师说：“的确是这样。然而，布莱恩第18题的答案是‘我不知道’，
而你的答案是‘我也不知道’。”