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
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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
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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