22.【解析】选D。句意：巴西的绿色环境组织计划发起一场保护热带雨林免于消失的运动。campaign运动，符合题意。commitment责任，义务；承诺；conflict冲突；抵触；争端；regulation规章制度。
23.【解析】选C。分析句子结构可知，“_______ in the city of Huai’an”作定语修饰a hospital。be located in位于，因此用过去分词作定语。“located in the city of Huai’an”相当于“which is located in the city of Huai’an”。
