【题目】The scientist knows nothing about the matter, because he is always ______ himself in scientific study.
A. burying B. devoting C. focusing D. concentrating
在线课程【答案】A
【解析】
试题分析：A. bury埋葬；B. devote奉献，致力于；C. focus集中；D. concentrate集中，全神贯注。句意：这个科学家对此事一无所知，因为他总是埋在科学研究中。此处指潜心研究，故选A.