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
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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
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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