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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单项选择题
The purpose of the special instruments mentioned in the third paragraph_________.
A．magnify the image of the sun
B．block out the sun's intense light
C．measure the amount of energy emitted by the sun
D．photograph the sun
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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