单项选择题

A．Book publishers.
B．Librarians,
C．New university students.
D．Faculty members.
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单项选择题
A．One.B．Two.C．Three.D．Four.
A．One.
B．Two.
C．Three.
D．Four.
单项选择题
A．The first period of cold, wintry days in autumn.B．The turning of color and falling of leaves.C．A large mass of warm tropical air carried northward.D．The southwestern winds.
A．The first period of cold, wintry days in autumn.
B．The turning of color and falling of leaves.
C．A large mass of warm tropical air carried northward.
D．The southwestern winds.
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