試題詳解

30 Our ability to draw strong conclusions as to the efficacy of school-based obesity prevention programs is limited by the small number of published studies and by methodological concerns.
(A)Due to the small number of published studies and the uncertainty in research methods, our school-based obesity prevention programs can be effective.
(B)Because the number of published studies is limited and the research methods are problematic, we still cannot be sure exactly how effectively the programs prevent obesity in school.
(C)The number of published research findings and methodological problems affect the accuracy of school obesity prevention programs.
(D)The accurate conclusion in obesity prevention lies not in a sufficient number of studies but in a careful design of research methodology.