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The conference had been held to discuss the effects of tourism      the wildlife in the area.

         A．in        B．on       C．at       D．with

 The conference had been held to discuss the effects of tourism ___ the wildlife in the rainforest.

         A. in                             B. on                                     C. at                            D. with

 The conference had been held to discuss the effects of tourism ___ the wildlife in the rainforest.

         A. in                             B. on                                     C. at                            D. with

The conference had been held to discuss the effects of tourism ______ the wildlife in the area.

A. in 　　　　　 B. on 　　　　　 C. at 　　　　　 D. with

The conference had been held to discuss the effects of tourism      the wildlife in the area.

       A．in     B．on     C．at      D．with