单项选择题

A．Because you get the habit of staying up late.
B．Because you haven’t taken sleeping pills.
C．Because you sleep for hours after dinner.
D．Because you fail to do some exercises.
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单项选择题
A．Workers.B．Students.C．Engineers.D．Businessmen.
A．Workers.
B．Students.
C．Engineers.
D．Businessmen.
单项选择题
A．How New York became the largest city in the Unite States.B．How the Eric Canal is built.C．Why New York has attracted so many people from the world.D．Their tour in New York.
A．How New York became the largest city in the Unite States.
B．How the Eric Canal is built.
C．Why New York has attracted so many people from the world.
D．Their tour in New York.
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