It’s ten years since the scientist on his life’s work of discovering the valuable chemical.
A. made for
B. set out
C. took off
D. turned up
网友回答
A. made for
(答案→)B. set out
C. took off
D. turned up
解析：此题考查短语动词的辨析。make for some place “走向”；set out on sth. “开始做”；take off “脱下，(飞机)起飞”；turn up “出现、显现”。