单项选择题

What’s the main topic of the course

A．College credit.
B．Free theater tickets.
C．A certificate of completion.
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单项选择题
A．Silicon is much more uncommon than carbon.B．Carbon is much more common than silicon.C．Silicon is much more common.
A．Silicon is much more uncommon than carbon.
B．Carbon is much more common than silicon.
C．Silicon is much more common.
单项选择题
A．It allowed workers to spend more time at home.B．It gave workers opportunity for better training.C．It let workers live far from their jobs.
A．It allowed workers to spend more time at home.
B．It gave workers opportunity for better training.
C．It let workers live far from their jobs.
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