单项选择题

A．The echo in the church in Missouri was most unusual.
B．Mark Twain’’s two friends had never heard a real echo.
C．Mark Twain was taken in by his friends.
D．Mark Twain knew how to tease his friends.
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单项选择题
A．50 underground stations were made waterproof.B．A flood wall was built.C．An alarm system was set up.D．Rescue teams were formed.
A．50 underground stations were made waterproof.
B．A flood wall was built.
C．An alarm system was set up.
D．Rescue teams were formed.
单项选择题
A．A weak heart.B．A skin disease.C．Bronchitis.D．Kidney trouble.
A．A weak heart.
B．A skin disease.
C．Bronchitis.
D．Kidney trouble.
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