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
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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
单项选择题
The author refers to the excessive intake by Americans of alcohol and tobacco and drug use in order to ______.
A．show that some health problems cannot be attacked by better medical care
B．demonstrate that use of tobacco and intoxicants is detrimental to health
C．cite examples of individual behavior that have adverse consequences for health status
D．illustrate ways in which excessive affluence may contribute to a poor health status
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