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单项选择题

Questions 17 ～ 20 are based on a monologue by a tour guide giving some information about the BART system. You now have 20 seconds to read Questions 17 ～ 20.

What is the cost of a round trip
A．Two dollars.
B．Four dollars.
C．More than that of a one-way trip.
D．Double that of a one-way trip.
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