单项选择题

The custom has been passed down since the 19th century.

A．这名顾客自从19世纪就死了。
B．这种风俗从19世纪以来一直流传到现在。
C．这种风俗是从19世纪流传过来的。
D．海关制度从19世纪以来一直流传到现在。
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Aren't they ______
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单项选择题
Psychologists study the meaning of color preference because ______.
A．colors may affect the emotional states of the people
B．colors may decide the results of our work and study
C．color preference can tell you who your friends are
D．color preference can help you to see through your enemies
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