单选题
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?
【正确答案】
A
【答案解析】
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