those的指代问题
A broad public discussion of environmental problems began in the mid-l980s, when the first green groups formed in opposition to Erevan's intense industrial air pollution and to nuclear power generation in the wake of the 1986 reactor explosion at Chernobyl. Environmental issues helped form the basis of the nationalist independence movement when environmental demonstrations subsequently merged with those for other political causes in the late 1980s.
请问老师，这句话最后结尾的those指的是什么？
最佳答案 2021-09-16 11:39
A broad public discussion of environmental problems began in the mid-l980s, when the first green groups formed in opposition to Erevan's intense industrial air pollution and to nuclear power generation in the wake of the 1986 reactor explosion at Chernobyl. Environmental issues helped form the basis of the nationalist independence movement when environmental demonstrations subsequently merged with those for other political causes in the late 1980s.
those 是替代词，为避免重复替代前文的 demonstrations，前文是“环保示威”，后者指“政治示威”。
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