单项选择题

According to the author, the introduction of the computer is a revolution mainly because ______.

A．the computer has revolutionized the workings of human mind
B．the computer can perform the tasks that could only be done by humans before
C．computers have helped to switch to an information technology
D．computers have a great impact on society
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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．providing information that the reader can use to improve his or her personal health
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 of alcohol, tobacco, and drug in order to illustrate that ______.
A．some health problems cannot be solved by better medical care
B．his use of alcohol and other substances is harmful to health
C．poor health results from tack of proper medical care
D．wealth may contribute to poor health status
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