PREP 2-15,32

15.     (25986-!-item-!-188;#058&002914)

Some airlines allegedly reduce fares on certain routes to a level at which they lose money, in order to drive competitors off those routes.  However, this method of eliminating competition cannot be profitable in the long run.  Once an airline successfully implements this method, any attempt to recoup the earlier losses by charging high fares on that route for an extended period would only provide competitors with a better opportunity to undercut the airline's fares.

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

(A) In some countries it is not illegal for a company to drive away competitors by selling a product below cost.

(B) Airline executives generally believe that a company that once underpriced its fares to drive away competitors is very likely to do so again if new competitors emerge.

(C) As part of promotions designed to attract new customers, airlines sometimes reduce their ticket prices to below an economically sustainable level.

(D) On deciding to stop serving particular routes, most airlines shift resources to other routes rather than reduce the size of their operations.

(E) When airlines dramatically reduce their fares on a particular route, the total number of air passengers on that route increases greatly.

 请教大家这个weaken该怎么做？

 请教大家这个weaken该怎么做？

Paleontologist: About 2.8 million years ago, many species that lived near the ocean floor suffered substantial population declines.  These declines coincided with the onset of an ice age.  The notion that cold killed those bottom-dwelling creatures outright is misguided, however; temperatures near the ocean floor would have changed very little.  Nevertheless, the cold probably did cause the population declines, though indirectly.  Many bottom-dwellers depended for food on plankton, small organisms that lived close to the surface and sank to the bottom when they died.  Most probably, the plankton suffered a severe population decline as a result of sharply lower temperatures at the surface, depriving many bottom-dwellers of food.

In the paleontologist's reasoning, the two portions in boldface play which of the following roles?

(A) The first introduces the hypothesis proposed by the paleontologist; the second is a judgment offered in spelling out that hypothesis.

(B) The first introduces the hypothesis proposed by the paleontologist; the second is a position that the paleontologist opposes.

(C) The first is an explanation challenged by the paleontologist; the second is an explanation proposed by the paleontologist.

(D) The first is a judgment advanced in support of a conclusion reached by the paleontologist; the second is that conclusion.

(E) The first is a generalization put forward by the paleontologist; the second presents certain exceptional cases in which that generalization does not hold.

我觉得选C，我不知道怎么错了？请教大家怎么做BF题？谢谢了

A. Wrong. Legality is not part of the argument.

C. Wrong. It follows that the airline reduces price to a level it loses money.

D Wrong. Argument did not mention decison to stop serving particular routes.

E Wrong. When passenger increases, more money is lost. It is not relevant to the argument.

B. Correct, if true, it will shun away competitors even after when airline increases the price.

E Wrong. When passenger increases, more money is lost. It is not relevant to the argument.

第一题我做的题号是27。我之前也选的E，不过后来我发现E错了，就像ls说的。

至于B为什么是正确的我的想法是：题目是一个充分性的问题。airlines reduce fares的充分条件(in order to)是drive compititors off ，即drive compititors off =〉airlines reduce fares。B选项说if compititors emerge, company underprices fares, 即其他原因推出结果。所以weaken the argument.

不知道我的想法对不对啊？哪位NN不吝赐教出来指点指点啊！