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(云南省昆明市 2020届高三“三诊一模”摸底诊断测试) 俄罗斯东部地区(下图)油气资源丰富,已探明储量主要分布在东部的太平洋、北冰洋沿海大陆架和 66 0 N以南的东西伯利亚地区,但66 0 N以北的东西伯利亚地区地质勘探程度较低。随着2009年石油运输管线“泰纳线”及2019年中俄东线天然气管道相继建成使用,当地居民外迁的趋势明显减缓。据此完成 4~6 题。 长期以来俄罗斯东部地区居民日趋减少的主要因素是( )A.
政策
B.
经济
C.
资源
D.
交通
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