(經(jīng)典回放)The conference has been held to disucss the effect of tourism ________ the wild life in the area．

[　　]

A．in

B．on

C．at

D．unitl

答案：B
提示：

　　“對……產(chǎn)生影響”為have an effect on”

　　句意：“會議討論了旅游對這個地區(qū)的野生動物的影響�！�


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