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题库 / Prep2007E2-CR-15
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?
In some countries it is not illegal for a company to drive away competitors by selling a product below cost.
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.
As part of promotions designed to attract new customers, airlines sometimes reduce their ticket prices to below an economically sustainable level.
On deciding to stop serving particular routes, most airlines shift resources to other routes rather than reduce the size of their operations.
When airlines dramatically reduce their fares on a particular route, the total number of air passengers on that route increases greatly.
我懂了！终于懂了！这是个两层逻辑嵌套的。
首先，一些航空公司用大降价方法来挤走竞争者（长期看来是为了盈利）。
第二层逻辑，即文段作者认为，他们的计划不能成功，因为他们的做法（先降价挤走竞争者，再提价回本）不能够达到预期目的。
题目问削弱论述，应该是削弱第二层逻辑。而第二层是对第一层逻辑的“方案不能导致目的”型的削弱，要抨击这一点，所以B对。E的话根本没管论述的核心逻辑，对E不是直接削弱的，
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