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.
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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