题目:As is mentioned in the card, the limitation of the research paper mainly lies in that_____.
A. the data analysis is hardly reliable
B. the research sample is not wide enough
C. the findings are of no practical value
D. the research method is out-of-date
喵查答案:B
从文中“the survey sample was restricted to mid-level management (此次调查只局限于中层管理人员)”可知答案为B。