单项选择题

What is the woman studying

A．The kinds of molecules in which carbon may be replaced by silicon.
B．The importance of silicon.
C．The difference between molecules and silicon.
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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．British.B．Brazil.C．Boston.
A．British.
B．Brazil.
C．Boston.
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