单项选择题

According to the passage, the cost increase in the rail industry is mainly caused by ______.

A．the continuing acquisition
B．the growing traffic
C．the cheering Wall Street
D．the shrinking market
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单项选择题
It can be inferred from paragraph 3 that ______.
A．shippers will be charged less without a rival railroad
B．there will soon be only railroad company nationwide
C．overcharged shippers are unlikely to appeal for rate relief
D．a government board ensures fair play in railway business
单项选择题
According to those who support mergers, railway monopoly is unlikely because ______.
A．cost reduction is based on competition
B．services call for cross-trade coordination
C．outside competitors will continue to exist
D．shippers will have the railway by the throat
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