【正确答案】 D

【答案解析】[听力原文]
   Criticism of research lays a significant foundation for future investigative work, but when students begin their own projects, they are likely to find that the standards of validity in fieldwork are considerably more rigorous than the standards for most library research. When students are faced with the concrete problem of proof by field demonstration, they usually discover that many of the "important relationships" they may have criticized other researchers for failing to demonstrate are very elusive indeed. They will find if they submit an outline or questionnaire to their classmates for criticism, other students will make comments similar to some they themselves may have made in discussing previously published research. For example, student researchers are likely to begin with a general question but find themselves forced to narrow its focus. They may learn that questions whose meanings seem perfectly obvious to them are not clearly understood by others, or that questions which seem entirely objective to them appear to be highly biased to someone else. They usually find that the formulation of good research questions is a much more subtle and frustrating task than is generally believed by these who have not actually attempted it.
   What does the author think about trying to find weakness in other people's research?
事实细节题。短文开头提到Criticism of research lays a significant foundation for future investigative work. 即研究批评为以后的研究工作奠定了重要的基础。由此可知试图发现别人研究中的不足之处对未来的研究大有帮助。所以选项D正确。