单项选择题

Where does this conversation take place

A．In a store.
B．In a factory.
C．In a museum.
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单项选择题
A．7:45.B．8:15.C．8:00.
A．7:45.
B．8:15.
C．8:00.
单项选择题
The noise-killing system is not yet popular mainly because ______.
A．it is still being tried out
B．drivers still have their doubts
C．it increases the cost of car production
D．carmakers are not sure if it is necessary
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