It’s ten years since the scientist on his life’s work of discovering the valuable chemical.
A. made for
B. set out
C. blocked out
D. turned up
网友回答
A. made for
(答案→)B. set out
C. blocked out
D. turned up
解析：考察动词短语辨析。A朝…过去；有利于；B出发，动身；C遮住，挡住；阻塞；D出现，调高；句意：自从那位科学家出发开始寻找那种贵重的化学物质到现在已经10年了。根据句意说明B正确。