23.A recent sales study indicated that consumption of seafood dishes in Bay City restaurants has increased by 30 percent over the past five years. Yet there are no currently operating city restaurants that specialize in seafood. Moreover, the majority of families in Bay City are two-income families, and a nationwide study has shown that such families eat significantly fewer home-cooked meals than they did a decade ago but at the same time express more concern about eating healthily. Therefore, a new Bay City restaurant specializing in seafood will be quite popular and profitable.
A、如果基数比较小，增长30%没有意义。即使有意义也是在过去的5年，并不表示今后也会如此。即使今后也是如此，人们也未必喜欢到海鲜专店去吃海鲜。人们可能觉得在那些饭馆偶尔搭配海鲜会更有味道，而不是就是喜欢吃海鲜。B城现在没有海鲜专店可能从侧面反映了这个问题。
B、全国调查，调查类错误，抽样是否随机化。即使随机化，也是全国的，未必适用于B城。即使适用，人们不喜欢在家吃饭和喜欢更健康的食品，并不表示人们就喜欢吃海鲜，这之间不存在必然联系。
C、即使人们都会选择出去吃海鲜，该海鲜专店也未必会盈利。经济学常识，品牌成本。
24.The following appeared in a memo from the president of Viva-Tech, a manufacturer of high-tech medical equipment.
"In order to reduce costs, we should close some of our existing small assembly plants and build a large central plant. Grandview would be an ideal location for this new plant. First, of the locations that we have considered, Grandview has the largest adult population, so that we will be able to staff our plant quickly and easily. Second, since the average wage earned by workers in Grandview is less than that in the other locations, we should be able to keep production costs low. Last, as an inducement for us to build there, Grandview's town council has offered to allow us to operate for the first three years without paying city taxes."
A、作者没有能够给出充分的证据说明建造一个中心的大生产厂比维护几个小生产厂要节约成本。
B、G地区拥有最多的成人人口并不意味着该公司就能够快而容易地雇佣到工人，可能G地区的成人普遍不太愿意在高科技工厂工作，或者该地区的成人技术上普遍不符合该厂的要求。
C、G地区的平均工资要比其他地区低，也未必能够能真正减少工厂的成本。因为这些工人可能工作效率比其他地区都要低。
D、G地区政府虽然允许该工厂前三年免交城市税，可是作者没有交待该地区城市税的具体数额，如果很大的话，即使免去前三年，三年后将对公司造成很大的经济压力。
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