单选题：The conference has been held to discuss the effect of touris

题目分类：公共英语二级
题目类型：单选题
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The conference has been held to discuss the effect of tourism_________ the wildlife in the area. A．[ A ] in
B．[ B ]on　　在线ψ 考试中心┨
C．[ C ]at
D．[ D ] with

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