The conference has been held to discuss the effect of tourism______the wildlife in the area.

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问题 The conference has been held to discuss the effect of tourism______the wildlife in the area.

选项 A、in
B、on
C、at
D、with

答案B

解析本句意为：召开会议是为了讨论旅游业对此处野生动物的影响。effect“影响，效果”，表示“对…的影响”用介词on。

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