单项选择题

A．Chicago.
B．New York.
C．Boston.
D．Detroit.
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填空题
Communication becomes efficient when people understand ______ of cultures.
单项选择题
A．To help mariners.B．To improve ship design and sailing methods.C．To study astronomy and mathematics.D．To improve his own skill as a sailor.
A．To help mariners.
B．To improve ship design and sailing methods.
C．To study astronomy and mathematics.
D．To improve his own skill as a sailor.
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