单项选择题
What can visitors do at the Maryland Science Center
A．Learn science by trying it out.
B．Watch and take pan in a play.
C．Make gifts for their friends.
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单项选择题
How did Mr. Black retrurn to London
A．By train.
B．By ship.
C．By plane.
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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.
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