题目内容
【题目】Professor Jordon is well known for his __________ into the habits of the common housefly.
A. examination B. introduction
C. research D. expression
【答案】C
【解析】句意:Jordon教授是以研究常见的家蝇的习惯而著名的.A项考试;B项介绍;C项研究,符合题意;D项表达.
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