单项选择题

The immune system ______.

A．used to be unconnected with the brain
B．causes a lot of stress to people
C．can be affected by emotional factors
D．functions independently
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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
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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