单项选择题


Approximately how long will the course last

A． Nine days.
B． Two weeks.
C． One month.
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单项选择题
Where does Edgar Davis call from
A． British.
B． Brazil.
C． Boston.
单项选择题
What does the woman expect to learn from her study
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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