单项选择题

A．Giving a lecture.
B．Discussing political science.
C．Working on a science problem.
D．Reading twentieth-century literature.
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单项选择题
A．To keep active at work.B．To prevent from seeing the doctor.C．To contract infectious diseases more easily.D．To enjoy the pleasures of life.
A．To keep active at work.
B．To prevent from seeing the doctor.
C．To contract infectious diseases more easily.
D．To enjoy the pleasures of life.
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