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.
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单项选择题
A．Use of library facilities.B．Library regulations.C．Library personnel.D．Location of the library.
A．Use of library facilities.
B．Library regulations.
C．Library personnel.
D．Location of the library.
单项选择题
A．The role of inland waterways in the nation’s growth.B．The development of New York City as a seaport.C．The growth of the railroads.D．The disappearance of the canal system.
A．The role of inland waterways in the nation’s growth.
B．The development of New York City as a seaport.
C．The growth of the railroads.
D．The disappearance of the canal system.
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