单项选择题

The Maryland Science Center stays open ______.

A．very day from 10 a.m. to8 p.m.
B．almost all the weekdays and weekends
C．on Thanksgiving Day and Christmas Day
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单项选择题
Whom did Mr. Black buy presents for
A．His boss.
B．The son of his boss.
C．Mr. Black's wife.
单项选择题
Why did the boss send Mr. Black to China on business
A．Mr. Black had never been to China before.
B．Mr. Black was an able and hardworking man.
C．Mr. Black could buy something interesting for Tony.
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