单项选择题

All of the following are mentioned in the passage as factors affecting the health of the population EXCEPT ______.

A．the availability of medical care services
B．the genetic endowment of individuals
C．the nation's relative position in health status
D．an individual's life style
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单项选择题
Which of the following questions does the passage provide information to answer
A．What is the most powerful influence on the health status of a country's population
B．Which nation in the world leads in health status
C．Is the life expectancy of males in the U.S. longer than that of females
D．What are the most important genetic factors influencing the health of an individual
单项选择题
The author is primarily concerned with ______.
A．condemning the U.S. for its failure to provide better medical care to the poor
B．evaluating the relative significance of factors contributing to the poor health status in the U. S.
C．comparing the general health of the U.S. population with world averages
D．advocating specific measures designed to improve the health of the U.S. population
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