問題詳情
【題組】22.According to the author, clinical trials of vitamin supplements ________.
(A) often result in misleading conclusions
(B) take time and will not produce conclusive results
(C) should be conducted by scientists on a larger scale
(D) appear to be a sheer waste of time and resources
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)