单项选择题

The paragraphs following the passage most likely discuss which of the following

A．The remaining layers of the Sun.
B．The evolution of the Sun to its present form.
C．The eclipse of February 1979.
D．The scientists who study astronomy.

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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

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