【題目】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教授是以研究常見(jiàn)的家蠅的習(xí)慣而著名的.A項(xiàng)考試;B項(xiàng)介紹;C項(xiàng)研究,符合題意;D項(xiàng)表達(dá).

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