A、 It should only be attempted by experienced researchers.
B、 It may cause researchers to avoid publishing good work.
C、 It is currently being done to excess.
D、 It can be useful in planning future research.

【正确答案】 D

【答案解析】解析：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。

A、 The research has not been written in an interesting way.
B、 The research has been done in unimportant fields.
C、 The researchers did not adequately establish the relationships involved.
D、 The researchers failed to provide an appropriate summary.

【正确答案】 C

【答案解析】解析：事实细节题。文中指出they usually discover that many of the“important relationships”they may havecriticized other researchers for failing to demonstrate are very elusive indeed．所以选项C正确。

A、 It is more difficult than the students researchers may realize.
B、 The researcher should get help from other people.
C、 The questions should be brief so that they will be understood.
D、 It is important to follow formulas closely.

【正确答案】 A

【答案解析】解析：事实细节题。根据短文最后一句可知为研究课题设计一个合适的问题，要比研究者们想象的要难得多。所以选A。