单项选择题

The President followed historical ______ in forming the Cabinet.

A．precedent
B．herald
C．ancestor
D．forerunner
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单项选择题
The young couple ______ with the Whites during their stay in New York City.
A．put in
B．pat down
C．pat on
D．put up
单项选择题
Prague offers visitors a series of excursions and leads them into a rich and ______ past.
A．variable
B．diverse
C．different
D．changeable
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