单项选择题

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
C．excludes
D．demands

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
B．120
C．180
D．240

单项选择题According to the author, ______.

A．older adults need more physical exercises than the younger ones
B．younger adults are not necessary to take a physical examination before a fitness program
C．fitness programs for older adults should be well-monitored
D．poorly-designed fitness programs for older adults will do serious harms to them

单项选择题According to the passage, a private enterprise economy is characterized by ______.

A．private property and rights concerned.
B．manpower and natural resources control
C．ownership of productive resources
D．free contracts and prices

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