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
The word arbiters (Paragraph 4) most probably refers to those ________.
A．who work as coordinators
B．who function as judges
C．who supervise transactions
D．who determine the price
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