单项选择题

In the last paragraph, the word "scrapped" can be best replaced by ______.

A．scratched
B．reinforced
C．reduced
D．abandoned
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Which of the following countries is the locality of the R. E.R. system
A．England.
B．the United States.
C．Germany.
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Which of the following is NOT true of the public transportation systems in the developed countries
A．Commuter railroad service, trolleys and buses have been reduced in the U. S.
B．Subways have largely been maintained.
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D．U.S. officials think it worthwhile to subsidize public transportation.
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