[求助]五月一道机经

A recent poll found that over 80 percent of the residents of Nalmed Province favored a massive expansion of the commuter rail system as a means of significantly easing congestion on the province's highways and were willing to help pay for the expansion through an increase in their taxes. nevertheless, the poll results indicate that expansion of the rail system, if sucessfully completed, would be unlikely to achieve its goal of easing congestion, because______

A. most people in favor of expanding the rail system reported less congestion during their highway commute as the primary benefit they would experience

B of the less than 20 percent of residents not counted as favoring the expansion, about half claimed to have no opinion one way or the other

C the twice-daily periods of peak congestion caused by people commuting in cars have grown from about an hour each to almost two and a half hours each in the past 20 years

D expanding the commuter rail system will require the construction of dozens of miles of new railbed

E the proposed expansion to commuter rail system will make it possible for some people who both live and work at suurban locations to commute by rail.

请XDJM给个答案和解释啊!谢谢啦!

Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost always have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since________________

a: the patients who are correctly diagnosed with this test as not having appendicitis invariably having medical conditions that are much less serious than appendicitis

b: the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

c:all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis

d:every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis

e:the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis

B是最象答案,但是也没有找到解释的感觉.

请XDJM帮助帮助!