when a perceptible gap arises between a culture's expectations and the reality of that culture, the resulting tension can inspire a revitalization movement: an organized, conscious effort to construct a culture that fulfills long-standing expectations.
C They joined political organizations to protest the segregation of African American troops and the indignities they suffered in the military.
和原文对比，差的太多
1.revitalization movement ≠political organizations
2.目的不同
to construct a culture≠to protest the segregation
D 原文说的是，期望和现实的差距会resulting tension can inspire a revitalization movement:
最后一段，的确发生了revitalization movement
说明前者的存在
Some geologists wondered whether the absence of friction-generated heat could be explained by the kinds of rock composing the fault. geologists也不知道能否解释
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