单项选择题

As we know, physics ______ the science of energy.

A．was
B．were
C．is
D．are
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单项选择题
______ is well known to all, China will be an advanced and powerful country in the near future.
A．As
B．That
C．This
D．It
单项选择题
I am ______ of the same old breakfast every morning,
A．worn out
B．tired
C．ill
D．exhausted
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