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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．College credit.B．Free theater tickets.C．A certificate of completion.
A．College credit.
B．Free theater tickets.
C．A certificate of completion.
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