【题目】The result of this study confirmed the ________ assumption made by the scientist months ago.
A. previous B. precious C. potential D. practical
在线课程【答案】A
【解析】
试题分析：句意：这个研究结构证实了科学家数月前的猜测。A.previous先前的；B. precious珍贵的；C. potential有潜力的；D. practical实际的。A项符合语境。