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【题目】读美国某城市人口数量变化图,回答下列各题。

【1】下列年份中,该市人口数量最多的是( )

A. 1840 B. 1890

C. 1920 D. 1950

【2】关于该市人口数量变化原因的叙述,正确的是( )

A. 该市人口总数持续增加

B. 该市人口总数持续减少

C. 总体上看该市人口增长率先上升,后波动下降

D. 该市人口增长率持续下降

【答案】

【1】D

【2】C

【解析】

试题分析:

【1】只要人口数量增长率是正值,人口数量就一直在增长。仔细看图,1950年以前该市人口数量增长率一直是正值,1950年以后呈负增长,人口数量开始减少,所以该市人口数量最多的是1950年。DA、B、C错。【2】结合前面分析,该市人口总数在1950年前持续增加,1950年后减少,A、B、D错。总体上看该市人口增长率先上升,后下降,但下降速度有变化,呈波动下降,C 对。

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