The professor stressed the new medicine would shorten the treatment period from the current days to a minimum of four days.
A. alternatively
B. effectively
C. actively
D. negatively
网友回答
A. alternatively
(答案→)B. effectively
C. actively
D. negatively
解析：句意：这位教授强调这种新药会有效地缩短疗程，从目前的29天到最少4天。alternatively 二者择其一地；effectively 有效地；actively 积极地，主动地；negatively消极地。故选B。