单项选择题

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

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