请教GWD-5-15,讨论中的没说明白

illgetthere

Q15:

Lightbox, Inc., owns almost all of the movie theaters in Washington County and has announced plans to double the number of movie screens it has in the county within five years.  Yet attendance at Lightbox’s theaters is only just large enough for profitability now and the county’s population is not expected to increase over the next ten years.  Clearly, therefore, if there is indeed no increase in population, Lightbox’s new screens are unlikely to prove profitable.

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

Though little change in the size of the population is expected, a pronounced shift toward a younger, more affluent, and more entertainment-oriented population is expected to occur.

The sales of snacks and drinks in its movie theaters account for more of Lightbox’s profits than ticket sales do.

In selecting the mix of movies shown at its theaters, Lightbox’s policy is to avoid those that appeal to only a small segment of the moviegoing population.

Spending on video purchases, as well as spending on video rentals, is currently no longer increasing.

There are no population centers in the county that are not already served by at least one of the movie theaters that Lightbox owns and operates.

我选了C，但其实我觉得哪个都不太对，请各位帮忙 谢拉

天之角

这道题如果我没记错应该是选A吧

conclusion: Clearly, therefore, if there is indeed no increase in population, Lightbox’s new screens are unlikely to prove profitable.

a.Though little change in the size of the population is expected, a pronounced shift toward a younger, more affluent, and more entertainment-oriented population is expected to occur.

意思是说虽然人口总数没有太大变化，但由于人口年龄结构的变化有更多人对娱乐感兴趣，也就会有更多人到电影院，所以削弱了结论。（个人意见）

illgetthere

谢谢，有一定道理，但younger, more affluent, and more entertainment-oriented population就一定会去电影院从而prove profitable吗？

如果收入不抵成本呢？

[此贴子已经被作者于2005-9-9 19:01:39编辑过]

天之角

我觉得这可以用断桥来说明，这个if条件句暗含了一个假设就是说去看电影的人在总人口的比重是不变的，而A恰好否定了这个假设，所以是削弱。

illgetthere

make sense!

thanks a lot　天之角

rubygo

以下是引用天之角在2005-9-9 20:01:00的发言：
我觉得这可以用断桥来说明，这个if条件句暗含了一个假设就是说去看电影的人在总人口的比重是不变的，而A恰好否定了这个假设，所以是削弱。

我觉得C也可以否定这个假设亚。。。不明白