单项选择题

A．wearing appropriate clothing and shoesB．being mentall……

According to the passage, all of the following are advisable to older adults for a fitness program except ______.

A．wearing appropriate clothing and shoes
B．being mentally ready for physical exercises
C．including periods of warm-up and cool-down
D．avoiding any pressure to their hearts

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单项选择题The word embrace (Sent. 2, Para. 3) may convey the meaning of ______.

A．hugs
B．includes
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单项选择题The author mentions that the maximum THR for older adult participants in sports should he less than ______ beats per minute.

A．60
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C．180
D．240

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A．private property and rights concerned.
B．manpower and natural resources control
C．ownership of productive resources
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单项选择题In Para. 1, the desire of individuals to maximize their incomes means ______.

A．Americans are never satisfied with their incomes
B．Americans tend to overstate their incomes
C．Americans want to have their incomes increased
D．Americans want to increase the purchasing power of their incomes