The conference was held to discuss the effect that tourism has the wildlife in the area.
A. in
B. on
C. at
D. with
网友回答
A. in
(答案→)B. on
C. at
D. with
解析：考查固定词组。本题实际上考查的的have an effect on…对…有影响；本题是把the effect提前做完先行词，that指代先行词作为has的宾语。句意：会议被举行来讨论旅游业对这个地区野生动物的影响。故B正确。