单项选择题

I would like to say that a theory is essentially an abstract, symbolic representation of reality.

A．what it is conceived
B．that is conceived
C．that is being conceived of
D．what is conceived of
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单项选择题
The passage compares sound to ______.
A．the rising and falling of water in the ocean
B．the crests and valleys of mountain ranges
C．a flag waving in the air
D．a machine for measuring air pressure
单项选择题
A．AB．TheC．ThatD．This
A．A
B．The
C．That
D．This
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