单项选择题

Passage 1 Questions 25 to 27 are based on the passage you have just heard.

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．America.B．England.C．Switzerland.D．Sweden.
A．America.
B．England.
C．Switzerland.
D．Sweden.
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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