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
What happened to one of the four birds
A． It was dead on the way to London.
B． It flew away from the cage.
C． It was stolen by someone.
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