求教GWD 的一道题

alicejingli

In Rubaria, excellent health care is available to virtually the entire population, whereas very few people in Terland receive adequate medical care. Yet, although the death rate for most diseases is higher in Terland than in Rubaria, the percentage of the male population that dies from prostate cancer is significantly higher in Rubaria than in Terland.
Which of the following, if true, most helps to explain the disparity between the prostate cancer death rate in Rubaria and Terland?

A.Effective treatment of prostate cancer in its early stages generally requires medical techniques available in Rubaria but not in Terland.

B.Most men who have prostate cancer are older than the average life expectancy for male inhabitants of Terland.

C.Being in poor general health does not increase one’s risk of developing prostate cancer.

D.It is possible to decrease one’s risk of getting prostate cancer by eating certain kinds of foods, and such foods are more readily available in Rubaria than in Terland.

E.Among men in Rubaria, the death rate from prostate cancer is significantly higher for those who do not take full advantage of Rubaria’s health care system than for those who do.

个人感觉应该选c 可是答案选B，希望NN赐教

alicejingli

多谢赐教，顿时醒悟！那再问一道题啊，个人感觉选C，可是答案是D。
Parland’s alligator population has been declining in recent years, primarily because of hunting.Alligators prey heavily on a species of freshwater fish that is highly valued as food by Parlanders, who had hoped that the decline in the alligator population would lead to an increase in the numbers of these fish available for human consumption.Yet the population of this fish species has also declined, even though the annual number caught for human consumption has not increased.

Which of the following, if true, most helps to explain the decline in the population of the fish species?

A.The decline in the alligator population has meant that fishers can work in some parts of lakes and rivers that were formerly too dangerous.

B.Over the last few years, Parland’s commercial fishing enterprises have increased the number of fishing boats they use.

C.Many Parlanders who hunt alligators do so because of the high market price of alligator skins, not because of the threat alligators pose to the fish population.

D.During Parland’s dry season, holes dug by alligators remain filled with water long enough to provide a safe place for the eggs of this fish species to hatch.

E.In several neighboring countries through which Parland’s rivers also flow, alligators are at risk of extinction as a result of extensive hunting.

arthurman

C选项讲的是poor general health does not increase one's risk.但是文章没有说过T的人就是POOR GENERAL HEALTH的，只是说medical care is not adequate。 所以C是无关选项，而B中则说出了R的人死于这个病的比率高的真正原因：
        因为T的人都还没老到那个病侵袭的时候就已经死了。。
所以选B