Professor Jordon is well known for his _____ into the habits of the mon housefly.
A.examination
B.introduction
C.research
D.expression
网友回答
C解析research into对...研究：1)(作动词用)He is researching into the reading problems of young school children.2)（作名词用）to carry out a research(=some research)into the causes of brain damage.(对大脑损伤原因进行研究)。研究可译为make researches into, make a study of 或直接用动词study vt或research into (a problem etc.).