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
According to the passage, as the corona rays reach the planets, they become ________.
A．hotter
B．clearer
C．thinner
D．stronger
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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