单项选择题

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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单项选择题
According to the text, making monetary policy changes
A．is comparable to driving a car.
B．is similar to carrying out scientific work.
C．will not influence the economy immediately.
D．will have an immediate impact on the inflation rate.
单项选择题
In the author’’s opinions, housing is _________.
A．a problem solved only by the society and not by individuals
B．invariable and unchangeable
C．not determined by the society
D．socially determinant and changeable
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