E39.6 Unenlightened authoritarian managers rarely recognize a crucial reason for the low levels of serious conflict among members of democratically run work groups: a modicum of tolerance for dissent often prevents_________. (A) demur (B) schism (C) cooperation (D) compliance (E) shortsightedness 这里crucial reason 不就是冒号后面的内容么?既然是导致负面结果的原因,那冒号后面的内容也应该是负面的吧,为什么要选B呢??我混乱了···大家帮忙分析分析吧!