单项选择题

Matter on the Sun can exist only in the form of gas because of the Sun's ________.

A．size
B．age
C．location
D．temperature
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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
单项选择题
According to the text, the cost increase in the rail industry is mainiy caused by ________.
A．the continuing acquisition
B．the growing traffic
C．the cheering Wall Street
D．the shrinking market
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