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
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
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
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