单项选择题

What is the woman studying

A．Silicon is much more uncommon than carbon.
B．Carbon is much more common than silicon.
C．Silicon is much more common.
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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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A．The lack of a qualified sales force.B．A decline in the number of customers.C．Difficulty in transporting merchandis
A．The lack of a qualified sales force.
B．A decline in the number of customers.
C．Difficulty in transporting merchandis
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