单项选择题

The passage is mainly about ______.

A．how to keep fit
B．how to lose weight
C．the benefits brought about by regular exercises
D．exercises and diet
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单项选择题
Most middle-aged people get fatter, mainly because ______.
A．they made dietary changes when they grow old
B．of their sedentary living
C．they don't exercise regularly
D．the chemical activity in their body that uses the food to produce energy slows down
单项选择题
What can be inferred from the passage
A．The slower people lose weight, the less likely they are to achieve their goals.
B．People who are on diet merely lose muscle and water.
C．Regular exercises may reduce the chance of getting certain chronic diseases.
D．Physical activity use muscle tissue as its main source of energy.
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