单项选择题

The best exercise should require continuous______, rather than frequent stops and starts.

A．compassion
B．acceleration
C．frustration
D．exertion
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单项选择题
We now obtain more than two-thirds of our protein from animal sources, while our grandparents ______only one-half from animal sources.
A．originated
B．digested
C．deprived
D．derived
单项选择题
Obesity carries an increased risk of______.
A．mortality
B．mobility
C．longevity
D．maternity
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