单项选择题

This passage was written in ____________.

A．1912
B．1960
C．1972
D．1982
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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 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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