C、正如作者所说，O公司对14至25岁人群比较感兴趣，但作者并未说明MF的DS适合该人群。即使DS适合该人群，也正如作者在文中所提到的，DS只是在一个小地区获得了成功，并不代表可以在全国获得成功。

　　9.The following appeared in a memorandum from a dean at Omega University.

　　Fifteen years ago, Omega University implemented a new procedure that encouraged students to evaluate the teaching effectiveness of all their professors. Since that time, Omega professors have begun to assign higher grades in their classes, and overall student grade averages at Omega have risen by thirty percent. Potential employers apparently believe the grades at Omega are inflated; this would explain why Omega graduates have not been as successful at getting jobs as have graduates from nearby Alpha University. To enable its graduates to secure better jobs, Omega University should now terminate student evaluation of professors.

　　A、O大学的教授开始给学生更高的分数，并不一定是因为学生评价教授的机制的存在。可能是O大学的学生平均来说都要比以前学习刻苦了，或者说学习的课目较之15年前要简单了。

　　B、即使学生获得了更高的分数，是因为O大学的教授怕学生通过该机制对他进行不利的评价，从而使得潜在的雇佣者质疑这样的分数，也不一定能够解释O大学的毕业生找工作没有A大学毕业生成功的现象。找工作困难和其他很多因素都有关，例如专业对不对口，学生本身的寻求条件高低等。

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