单项选择题

At what age should people be introduced to jogging as an exercise

A．At puberty.
B．During childhood.
C．During adulthood.
D．During old age.
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单项选择题
Which of the following does jogging not do
A．Strengthen the breathing muscles.
B．Condition the heart.
C．Build strong shoulder muscles.
D．Promote a "training effect".
单项选择题
According to Freud's concepts, which aspect would MOST be looked upon as the chief executive or administrator-in-charge of the total personality, the rational and aware self
A．Id.
B．Ego.
C．Superego:
D．None of the above.
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