单项选择题

What problem did city merchants face ().

A. The lack of a qualified sales force.
B. A decline in the number of customers.
C. Difficulty in transporting merchandise.

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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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