单项选择题

With what topic is the second paragraph mainly concerned

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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The purpose of the new economic policy is not to hinder economic growth______ to guide it in a beneficial way.
A．and
B．as
C．but
D．nor
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When lights were suddenly turned on, the tiny 'beam of the flashlight was lost______ the bright lights.
A．amidst
B．among
C．against
D．into
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