【题目】下表为某国人口自然增长转变的四个阶段,阅读该表格,完成下列各题。
阶段 | 出生率(%) | 死亡率(%) |
a | 3.8 | 2.4 |
b | 1.3 | 1.0 |
c | 3.8 | 3.2 |
d | 2.9 | 1.7 |
【1】按照人口自然增长阶段的变化规律,该国人口发展先后排序正确的是( )
A. abcd B. cadb C. cdab D. acdb
【2】该国数据显示,最初人口增长模式的转变开始于( )
A. 出生率下降 B. 出生率上升 C. 死亡率下降 D. 死亡率上升
【3】b阶段人口自然增长特点的主要原因是( )
A. 经济发展水平较高 B. 人们受教育水平较低
C. 医疗卫生水平较低 D. 人们的生育意愿较高
【答案】
【1】B
【2】C
【3】A
【解析】
【1】人口发展具有一定的规律可循,经历了高高低、高低高、低低低三种不同的阶段。在较早,该国人口出生率和死亡率都较高,为表中的阶段c,之后,死亡率逐渐下降,为a,再之后,出生率也随之下降,对应d,最后,出生率和死亡率都降低到较低的水平,对应b。故顺序为cadb ,答案选B。
【2】从表中可以读出,从阶段c到阶段a,出生率保持在较高的水平,而死亡率大幅度下降,人口增长模式发生改变。故答案选C。
【3】读图中数据可知,b阶段人口的出生率、死亡率和自然增长率都处在较低的水平,说明经济发展水平较高,人们受教育水平较高,医疗卫生水平较高,人们的生育意愿较低,因此A正确,BCD错误。
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