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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S5. Why were pyramids constructed
单项选择题
Have you taken some measures to guard against the possibility that these schemes might ______ once again
A．fall apart
B．fall out
C．fall through
D．fall in
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