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题库 / Prep2012-CR-28
Mall owner: Our mall's occupancy rate is so low that we are barely making a profit. We cannot raise rents because of an unacceptably high risk of losing established tenants. On the other hand, a mall that is fully occupied costs about as much to run as one in which a rental space here and a rental space there stands empty. Clearly, therefore, to increase profits we must sign up new tenants.
Which of the following, if true, most seriously weakens the argument?
The mall's operating costs could be cut by consolidating currently rented spaces in such a way that an entire wing of the mall could be closed up.
The mall is located in a geographic area in which costs incurred for air-conditioning in the hot summers exceed those incurred for heating in the mid winters by a wide margin.
The mall's occupancy rate, though relatively low, has been relatively stable for several years.
The mall lost tenants as a result of each of the two major rent increases that have occurred there.
None of the mall's established tenants is likely to need additional floor space there in the foreseeable future.
感觉这个题目很奇葩。一般方案推理不能选另一个方案。难道破题点是最后一句话用了一个“must”？？？这个“must”的出现导致Owner 认为只有一个方案可以（增加新租户）。于是硬生生的从一个方案推理变成了因果推理？即只要推翻owner的结论就行了，也就是还有其他方案帮助增加盈利？如果Owner用了“could/might”这种词，就变成传统的方案题？
就是因果推理
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