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.
答案是C，没问题。
但关于D选项：
not unusually high. 到底是高还是低啊？
双重否定=肯定
不是不正常的高....
谢谢熊猫捧场
不过偶还是疑惑啊
不是不正常的高.... 不就是高么？那不是就削弱了结论么？
Sorry, 昨天在办公室忙别的呢，没仔细看题。
刚才查了一下字典：
1）unusually high/large/quiet etc
higher, larger etc than usual 极端高
unusually high levels of pollution
2）used to say that something is not what usually happens
Unusually for me, I fell asleep very quickly.
死记吧，第一个意思是fixed phrase.
这个问题提得好啊~
恩，现在明白了
呵呵，说穿了还是语法问题啊
多谢多谢！
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