单项选择题

All the following are parts of the sun's atmosphere except ____________.

A．the corona
B．the chromosphere
C．the photosphere
D．the core
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单项选择题
The second paragraph is mainly concerned with ____________.
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
It can be inferred from the passage that a clear view of the sun's outer layer is usually vented by_______.
A．the sun's rays
B．an eclipse
C．lack of light
D．the great distance
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