单项选择题

The man want to know ______

A．how long the show will last
B．how to avoid lead poisoning
C．how the skyscraper was built
D．how glass and crystal differ
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单项选择题
This conversation is most likely to take place ______
A．at an industrial site
B．at a department store
C．in a classroom
D．in a skyscraper
单项选择题
The woman is probably ______
A．a pharmacist
B．a salesperson
C．a guide
D．an engineer
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