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
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.
单项选择题
What are they talking about
A． About milk.
B． About a film.
C． About a song.
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