单项选择题

The rats fed unrestricted diets do NOT ______

A．have one preventing-aging protein increased
B．have their cell death increased or doubled
C．have their DNA fragmentation doubled
D．have the levels of proteins increased
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I think that you should take a(n) ______ language course to improve your English.
A．mid
B．middle
C．medium
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A．committed
B．linked
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