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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

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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
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

单项选择题The passage is mainly about ______.

A．how American goods are produced
B．how American consumers buy their goods
C．how American economic system works.
D．how American businessmen make their profits.