单选题 The problem with activists is that far too often they merely ______ the protection of various ecosystems, instead of taking a lead role in their ______ .

A、 (A) circumvent.. stability
B、 (B) abridge.. solution
C、 (C) diversify .. precedent
D、 (D) advocate .. management
E、 (E) abhor.. demise

【正确答案】 D

【答案解析】The context of the sentence indicates that activists should be taking a lead role in something that has to do with the protection of ecosystems. Advocate means "to speak out in favor of," and it makes sense that there might be a problem if activists simply speak out in favor of protecting ecosystems, and don't actually do anything to help manage the ecosystems. The other answer choices do not fit the context of the sentence.