我觉得这题描述的情况如果要成立还有个隐含的前提，就是要默认在Goreville's central shopping district的vacant location上只能开stores，不能开别的，比如像15楼同学说的开个餐饮店，或者开个银行网点之类的都行。那样的话我们再看B选项反而就成了加强而不是削弱论点了。因为B选项言外之意是越来越多的打折店--即跟Colson不同类型的店--开张出来了，那么同理，在SpendLess周围新开的店只要不是和SpendLess或Colson雷同的店就可以存活，也就达到了不让location stay vacant for long的结果。所以我认为这道题的前提是有问题的，没有看懂B选项的同学可能就是因为这个原因吧。
不过，如果选B，那么“In the ?ve years since the opening of Colson’s, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson’s. And the stores that have opened in the central shopping district since Colson’s opened have been discount stores.”,可不可以理解为C店的存在是满足了nondiscount的需求，新开的店是满足了一种C店不能满足的discount的需求，所以行得通；这样的话，反过来就不能weaken the argument，因为those locations will not stay vacant for long, because the new stores are nondiscount stores
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发表于 2011-6-15 04:17:04
