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 part in a play.
C．Make gifts for their friends.
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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
Mr. Black said the local bird was an interpreter because______.
A．the three Chinese birds didn't know English
B．it was different from the Chinese birds
C．he was making a joke
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