单项选择题

What’s the main topic of the course

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