单项选择题

The old sailor had never studied navigation, but he had good ________knowledge of it.

A．periodical
B．tropical
C．empirical
D．vertical
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单项选择题
The President call on his people to work hard to improve the ________economy.
A．stationary
B．static
C．steady
D．stagnant
单项选择题
Although sports ________the household, Joe drew the line when they interfered with family traditions and routine.
A．overwhelmed
B．breached
C．dominated
D．impaired
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