请教GWD-TN5中的两题

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

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答案选E，不过能否请高人解释一下前三个选项的意思

GWD7-Q30:

Printwell’s Ink Jet Division manufactures ink-jet printers and the ink cartridges they use.  Sales of its ink-jet printers have increased.  Monthly revenues from those sales, however, have not increased, because competition has forced Printwell to cut the prices of its printers.  Unfortunately, Printwell has been unable to bring down the cost of manufacturing a printer.  Thus, despite the increase in printer sales, the Ink Jet Division must be providing the company with much smaller than it used to.

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

A.      Ink-jet printers in regular use frequently need new ink cartridges, and Printwell’s printers only accept Printwell’s ink cartridges.

B.       Unlike some competing companies, Printwell sells all of its printers through retailers, and these retailers’ costs account for a sizable proportion of the printers’ ultimate retail price.

C.      Some printer manufacturers have been forced to reduce the sale price of their ink-jet printers even more than Printwell has.

D.      In the past year, no competing manufacturer of ink-jet printers has had as great an increase in unit sales of printers as Printwell has.

答案选A,为什么不能选B