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【简答题】
人口的性别结构是指一个国家或地区两性人口数量的比例关系，它通常由性别比这个指标加以度量。性别比为平均100名女性所对应的男性人口的数量。下图为四个国家或地区人口性别比例曲线，读图，回答1—3题。 1、造成俄罗斯1950年性别比低的原因主要是 [     ] A、战争 B、移民 C、疾病 D、国家政策 2、图中曲线②代表珠江三角洲工业区的性别比例，造成20世纪80年代以来性别比较低的原因主要是 [     ] A、重工业发达，大量男性劳动力迁入 B、轻工业发达，大量女性劳动力迁入 C、不同性别死亡率不同造成的一种自然现象 D、当地重男轻女的思想严重 3、曲线①峰值的出现可能带来的问题有： ①人口老龄化 ②男女比例失调 ③婚姻困难等社会问题 ④劳动力缺乏 [     ] A、①② B、②③ C、③④ D、①④
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