单项选择题

With what topic is the second paragraph mainly concerned

A．How the Sun evolved.
B．The structure of the Sun.
C．Why scientists study the Sun.
D．The distance of the Sun from the planets.
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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
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 Le only one railroad company nationwide
C．overcharged shippers are unlikely to appeal for rate relief
D．a government board ensures fair play in railway business
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