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甲乙丙三人一起参加了物理和化学两门考试。三个人中,只有一个在考试中发挥正常。考试前,
甲说:如果我在考试中发挥不正常,我将不能通过物理考试。如果我在考试中发挥正常,我将能通过化学考试。
乙说:如果我在考试中发挥不正常,我将不能通过化学考试。如果我在考试中发挥正常,我将能通过物理考试。
丙说:如果我在考试中发挥不正常,我将不能通过物理考试。如果我在考试中发挥正常,我将能通过物理考试。
考试结束后,证明这三个人说的都是真话,并且:发挥正常的人是三人中惟一的一个通过这两门科目中某门考试的人;发挥正常的人也是三人中惟一的一个没有通过另一门考试的人。从上述断定能推出以下哪项结论?
A.甲是发挥正常的人。
B.乙是发挥正常的人。
C.丙是发挥正常的人。
D.题干中缺乏足够的条件来确定谁是发挥正常的人。
E.题干中包含互相矛盾的信息。

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