单项选择题

A．Book publishers.
B．Librarians.
C．Returning faculty members.
D．New university students.
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单项选择题
A．Cigarette ashes.B．Nicotine.C．Tar.D．Not mentioned.
A．Cigarette ashes.
B．Nicotine.
C．Tar.
D．Not mentioned.
单项选择题
A．The shortage of water,B．The shortage of food.C．The condition of weightlessness.D．The great pressure outside the spacecraft.
A．The shortage of water,
B．The shortage of food.
C．The condition of weightlessness.
D．The great pressure outside the spacecraft.
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