关 于 prep2-25一 个 双 重 否 定 的 问 题

25.
            (30469-!-item-!-188;#058&005456)

In the past year Harborville has had an unusually high rate of new cases of a certain disease.  An investigation revealed that over the past five years Harborville's public water supply has had a high level of pollutants.  Medical researchers have hypothesized that Harborville's water is responsible for the high rate of new cases of the disease.

Each of the following, if true, provides additional support for the researchers' hypothesis EXCEPT:

(A) Most of the people afflicted with new cases of the disease had regularly drunk larger quantities of Harborville's water than had other Harborville residents.

(B) The same type of pollutants that were found in Harborville's water have independently been linked to occurrences in other towns of high rates of the disease.

(C) Some of the people with newly diagnosed cases of the disease began to develop the disease before Harborville's water became polluted.

(D) The rate of new cases of the disease among residents of Harborville who get their water from private sources is not unusually high.

(E) Towns with geographic and demographic characteristics similar to those of Harborville but without polluted water do not have as high a rate of the disease as does Harborville.

这 题 答 案 选 C,我 没 疑 问 ,但 问 题 是 D里 面 的 NOT UNUSUALLY,双 重 否 定 不 是 表 示 肯 定 吗?这 样 的 话 ,D的 意 思 `````

谁  来 帮 我 看 看 .

D的意思是：从私家水源中取水使用的人的新发疾病比率并“未异常”偏高。

“未异常偏高”就是“正常”水平。

据个例子：小明吃的并不比常人多，也就是小明和常人的饭量差不多。

再提醒一句：别总用什么“双重否定=肯定”的所谓“技巧”去做题。会把你弄得更晕。扎根阅读能力才是正道。而且，“双重否定=肯定，但不等于抵消”。

谢 谢 ,明 白 了 .

做 题 做 晕 了 ,一 时 没 转 过 弯 来 .