单项选择题

A．Because few people owned the necessary equipment.
B．Because the music selection was not very popular.
C．Because few ships came into New York harbor.
D．Because the radio signal was too weak to reach the mass audience.
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单项选择题
A．Inland transportation in the nineteenth century. B．Historical aspects of mail delivery. C．Vehicles currently in use by the postal service. D．The invention of the railroad.
A．Inland transportation in the nineteenth century.
B．Historical aspects of mail delivery.
C．Vehicles currently in use by the postal service.
D．The invention of the railroad.
单项选择题
A．Students are not required to attend regular class lectures. B．The professor records class lectures for review. C．Classes are held at various locations throughout the area. D．Students receive credit for work experience.
A．Students are not required to attend regular class lectures.
B．The professor records class lectures for review.
C．Classes are held at various locations throughout the area.
D．Students receive credit for work experience.
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