og174.
In 1987 sinusitis was the most common chronic medical condition in the United States,
followed by arthritis and high blood pressure, in that order.
The incidence rates for both arthritis and high blood pressure increase with age, but the
incidence rate for sinusitis is the same for people of all ages.
The average age of the United States population will increase between 1987 and 2000.
Which of the following conclusions can be most properly drawn about chronic medical
conditions in the United States from the information given above?
(A) Sinusitis will be more common than either arthritis or high blood pressure in 2000.
(B) Arthritis will be the most common chronic medical condition in 2000.
(C) The average age of people suffering from sinusitis will increase between 1987 and
2000.
(D) Fewer people will suffer from sinusitis in 2000 than suffered from it in 1987.
(E) A majority of the population will suffer from at least one of the medical conditions
mentioned above by the year 2000.
174.
Given that the incidence rate for sinusitis is the same for people of all ages, and that the
average age of the population will increase, if follows that the average age of people suffering from sinusitis will increase. Therefore, C is the best answer.
这段解释很难看懂, 大家帮帮忙
if follows that the average age of people suffering from sinusitis will increase.应该是IT follows that the average age of people suffering from sinusitis will increase.
既然美国人口该病的平均年龄增加，得病的人的平均年龄当然也增加了。这其实是废话。
感谢版主,我是有点糊涂了
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