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?

1. Many of the patients who receive coronary bypass surgery are less than 55 years old.
2. Possible benefits of coronary bypass surgery include both relief from troubling symptoms and prolongation of life.
3. 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.
4. 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.

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.

答案是E, 我选D 怎么也想不通

还有这个

Q30:

Printwell’s Ink Jet Division manufactures ink-jet printers and the ink cartridges 墨盒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?

1. Ink-jet printers in regular use frequently need new ink cartridges, and Printwell’s printers only accept Printwell’s ink cartridges.
2. 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.
3. Some printer manufacturers have been forced to reduce the sale price of their ink-jet printers even more than Printwell has.
4. 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.

In the past year, sales of Printwell’s ink-jet printers have increased more than sales of any other type of printer made by Printwell.

为什么选a。 c为什么不行？

疯了疯了

逻辑狂错一大堆

但是就算墨盒都赚钱了， 怎么知道他这个部分给公司的贡献就大了呢？

因为打印机在赔钱阿！墨盒挣的部分能弥补打印机赔的部分么？这个都没有说啊？