Fast-food restaurants make up 45 percent of all restaurants in Canatria. Customers at these restaurants tend to be young; in fact, studies have shown that the older people get, the less likely they are to eat in fast-food restaurants. Since the average age of the Canatrian population is gradually rising and will continue to do so, the number of fast-food restaurants is likely to decrease.

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


Fast-food restaurants in Canatria are getting bigger, so each one can serve more customers.

Some older people eat at fast-food restaurants more frequently than the average young person.

Many people who rarely eat in fast-food restaurants nevertheless eat regularly in restaurants.

The overall population of Canatria is growing steadily.

As the population of Canatria gets older, more people are eating at home.

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考题讲解

情景：快餐在Canatria这个地方占据45%的份额。研究表明，越老的人越不爱吃快餐。因为Canatria地区人口老龄化，所以快餐店的数量会下降。

推理：本题为因果推理。顺序的因果逻辑：因为越老的人越不爱吃快餐且Canatria地区人口老龄化，所以快餐店的数量会下降
（因）前提：越老的人越不爱吃快餐且Canatria地区人口老龄化
（果）结论：快餐店的数量会下降

选题方式：因果推理只有一个评估方向，简而言之，即，反驳推理文段中的结论。

选项分析：

A选项：在Canatria的快餐店变大了，因此每个快餐店能服务更多的顾客了。如果每个快餐店能服务更多客户了，那么快餐店的数量就更应该少了，加强了推理文段。

B选项：某些年龄大的人吃快餐的频率比年轻人平均的频率还高。某些年龄大的人的情况并不代表整体人群，所以本选项不能反驳结论。

C选项：很多很少吃快餐的人会规律性的在餐馆吃饭。本选项和推理文段的结论无关。

D选项：Correct. Canatria的整体人口数在上升。如果整体人口变多，那么就算整体人口的平均年龄上升，也有可能会有更多的年轻人，如此让快餐店的数量随之上升。

E选项：因为Canatria的人年龄变大，更多人的选择在家吃饭。如果更多人在家吃饭，那么饭馆的数量就更应该下降了。

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