When most socialist systems eventually disappeared at the turn of the 1980s and 1990s, a great cycle in modern economic and social history came to an end.
(d)复活节岛的文明在繁荣了一千年后消亡了,这很可能是人口数量超过了该岛大自然的承受力。
(d) It is also most likely that when its population outgrew the island's natural carrying capacity the civilization of the Easter Islands collapsed, after a thousand years of prosperity.
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