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下列选项中，不需要设置明显的安全警示标志的是（）。
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Traditionally, universities have carried out two main activities ： research and teaching. Many experts would argue that both these activities play a critical role in serving the community. The fundamental question, however, is how does the community want or need to be served？
In recent years universities have been coming under increasing pressure from both the governments and the public to ensure that they do not remain “ivory towers(象牙塔）" of study separated from the realities of everyday life. University teachers have been encouraged，and in some cases constrained (强迫）,to provide more courses which produce graduates with the technical skills required for the commercial use. (78) If Aristotle wanted to work in a university in the UK today，he would have a good chance of teaching computer science but would not be so readily employable as a philosopher.
A post-industrial society requires large numbers of computer programmers, engineers, managers and technicians to maintain and develop its economic growth but “man”, as the Bible says, “does not live by bread alone. ’’ (79) Apart from requiring medical and social services，which do not directly contribute to economic growth，the society should also value and enjoy literature,music and the arts. Because they can also promote economic growth. A successful musical play, for instance, can contribute as much to the Gross National Product through tourist dollars as any other things.
The main idea of the first paragraph is that_________.
某位认知心理学家发明了一个可以改进阅读速度和理解力的程序。用这一程序和一个假程序来训练学习心理学导论课程的学生，每组30名学生。每组的成绩用以下三种方式进行测量：
(1)为这个项目设计的一个阅读理解测验
(2)为这个项目设计的一个阅读速度测验
(3)他们下一次心理学导论的成绩
用这个程序训练的学生在阅读理解速度测验和阅读速度的成绩明显的好于用假程序训练的学生。在两组学生的心理学测验的成绩上没有显著差异。从这些结果中，你能得出什么结论？你是否认为在心理学考试结果上获得的零结果是有问题的？请说明你的理由。
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