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．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.
单项选择题
A．Nine days.B．Two weeks.C．One mont
A．Nine days.
B．Two weeks.
C．One mont
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