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, Grandviews 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。

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