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

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.

单项选择题

All of the following are parts of the Sun's atmosphere EXCEPT the ______.

A．corona
B．chromospheres
C．photosphere
D．core