GWD-2-10,GWD-7-17, 求助求助！！ 拜托拜托！！

请教各位牛人两道逻辑题：
Q28: GWD-2-10

Environmentalist:  The use of snowmobiles in the vast park north of Milville create sun acceptable levels of air pollution and should be banned.
Milville business spokesperson:  Snowmobiling brings many out-of-towners to Milville in winter months, to the great financial benefit of many local residents.  So, economics dictate that we put up with the pollution.

Environmentalist: I disagree:  A great many cross-country skiers are now kept from visiting Milville by the noise and pollution that snowmobiles generate.

Environmentalist responds to the business spokesperson by doing which of the following?

A.      Challenging an assumption that certain desirable outcome can derive from only one set of circumstances
B.      Challenging an assumption that certain desirable outcome is outweighed by negative aspects associated with producing that outcome
C.      Maintaining that the benefit that the spokesperson desires could be achieved in greater degree by a different means
D.     Claiming that the spokesperson is deliberately misrepresenting the environmentalist’s position in order to be better able to attack it
E.     Denying that an effect that the spokesperson presents as having benefited a certain group of people actually benefited those people

GWD-7-Q17:

Of patients over 65 years old who survived coronary bypass surgery—a procedure widely prescribed for people with heart disease—only 75 percent benefited from the surgery.  Thus it appears that for one in four such patients, the doctors who advised them to undergo this surgery, with its attendant risks and expense, were more interested in an opportunity to practice their skills and in their fee than in helping the patient.

Which of the following, if true, most seriously undermines the argument?

A: Many of the patients who receive coronary bypass surgery are less than 55 years old.
B: Possible benefits of coronary bypass surgery include both relief from troubling symptoms and prolongation of life.
C: Most of the patients in the survey decided to undergo coronary bypass surgery because they were advised that the surgery would reduce their risk of future heart attacks.
D: The patients over 65 years old who did not benefit from the coronary bypass surgery were as fully informed as those who did benefit from the surgery as to the risks of the surgery prior to undergoing it.
E: The patients who underwent coronary bypass surgery but who did not benefit from it were medically indistinguishable, prior to their surgery, from the patients who did benefit.

帮帮忙啊各位 不懂啊~~~

这两道题很明显.

1: D说的是 否定spokesperson说的那个snowmobile能使提升economic.这也就是Environmentalist最后说的.I disagree:  A great many cross-country skiers are now kept from visiting Milville by the noise and pollution that snowmobiles generate.

2:  原文说因为有25%没制好,是那些医生本来认为很有risk,也作,是他们想拿病人练手.E反对说的那些没制好的(25%)是因为误诊(不是医生想练手).也就是本来成功的比例是很高的.

LZ下次发帖要标明题号,分开发贴.

这么说第一题D咯？可答案显示似乎是C。。。

第2题E是说误诊吗？？