174. 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.
ans: c 我选B
不明白og解释：given the incidence rate for sinusitis is the same for people of all ages, and that the average age of population will increase, it follows that the average age of people suffering from sinusitis will increse. so c is right.
不是说所有年龄患病率相等吗？所以sinusitis不会more common 呀？！
麻烦哪位解释一下，在讲讲做题思路，谢谢了！：） | 
