单项选择题

A．A professor and a student.
B．A customer and a cashier.
C．An editor and an author.
D．A lawyer and his client.
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单项选择题
What is this article about
A．The Black Plague.
B．The flu epidemic of 1918.
C．The Plague of Justinian.
D．All epidemics.
单项选择题
A．Positive.B．Negative.C．Neutral.D．Not given.
A．Positive.
B．Negative.
C．Neutral.
D．Not given.
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