Professor Jordon is well known for his _
题型:选择题
问题:
Professor Jordon is well known for his _____ into the habits of the common housefly.
A.examination
B.introduction
C.research
D.expression
Professor Jordon is well known for his _____ into the habits of the common housefly.
A.examination
B.introduction
C.research
D.expression