单项选择题

The decline of bus ridership in the U.S. is caused by ______.

A．the rise of bus fares
B．the increased number of private cars
C．the improvement of the commuter railroad service
D．the poor condition of the transportation infrastructure

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单项选择题

As can be inferred from the passage, ______.

A．it is urgent to pass laws for gun control in the U.S.
B．people occupying high positions are more prone to crime
C．many criminals are intelligent enough to escape punishment
D．empty houses in the Philippines are often guarded by watch dogs

单项选择题

Which of the following countries is the locality of the R. E. R. system

A．England.
B．the United States.
C．Germany.
D．France.