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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.
要weaken的确实是however后面的论点，但是如果我们只看到profitable那么就没有必要给出once后面的那一长段内容了。而且前面说公司减价in order to挤出竞争者，后面的论点是：一旦这个机场后来涨价，其他的机场就有机会降价反击，B正好是从正面反驳，说其他机场没有机会反击因为一旦有新的竞争者出现原来的机场又会降价。（小机场根本扛不住）
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