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
As it is used in the passage, the word photosphere (Line 3, Para. 2) means______.
A．a scarlet gaseous envelope surrounding the Sun
B．the luminous envelope of gas surrounding the Sun
C．the mixture of gasses that surrounds any planet or star
D．the luminous irregular envelope of highly ionized gas outside the chromospheres of the Sun
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
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