【題目】讀美國某城市人口數(shù)量變化圖，回答下列各題。

【1】下列年份中，該市人口數(shù)量最多的是（ ）

A. 1840 B. 1890

C. 1920 D. 1950

【2】關(guān)于該市人口數(shù)量變化原因的敘述，正確的是（ ）

A. 該市人口總數(shù)持續(xù)增加

B. 該市人口總數(shù)持續(xù)減少

C. 總體上看該市人口增長率先上升，后波動下降

D. 該市人口增長率持續(xù)下降

【答案】

【1】D

【2】C

【解析】

試題分析：

【1】只要人口數(shù)量增長率是正值，人口數(shù)量就一直在增長。仔細看圖，1950年以前該市人口數(shù)量增長率一直是正值，1950年以后呈負增長，人口數(shù)量開始減少，所以該市人口數(shù)量最多的是1950年。D對。A、B、C錯。【2】結(jié)合前面分析，該市人口總數(shù)在1950年前持續(xù)增加，1950年后減少，A、B、D錯。總體上看該市人口增長率先上升，后下降，但下降速度有變化，呈波動下降，C 對。

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