单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Graduate students.
B．Undergraduate students.
C．Professors.
D．Library employees.
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单项选择题
A．They are trying to persuade people to buy cigarettes with less tar.B．They are trying to persuade people to smoke only a few cigarettes a day.C．They are trying to persuade people to smoke only during a break,D．They are trying to persuade people to give up smoking entirely.
A．They are trying to persuade people to buy cigarettes with less tar.
B．They are trying to persuade people to smoke only a few cigarettes a day.
C．They are trying to persuade people to smoke only during a break,
D．They are trying to persuade people to give up smoking entirely.
单项选择题
A．Air.B．Medicine.C．Food.D．Water.
A．Air.
B．Medicine.
C．Food.
D．Water.
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