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
Besides its main use the noise-killing system can___________.
A．make a car lighter
B．make a car quieter
C．reduce the cost of a silencer
D．improve the performance of a silencer
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