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2011-09-13 17:40:00   来源：作文地带整理    双击单词自动翻译

　　The claim does not indicate who conducted this survey and when and how the survey is conducted, neither does it mention what is the sample size, or how the samples are selected. Until these questions are answered the results of this survey are worthless as evidence to support that….

　　Besides, the author assumes that A and B are mutually exclusive alternatives and there is no room for a middle ground. However, the author has never offered any reasons or evidences for imposing an either-or choice. Common sense and observation tells us that adjoining both A and B might produce better results.