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【题目】阅读下列材料,回答问题。

世界人口数量已经从1950年的25亿和1980年的44亿猛增到1999年10月12日的60亿。据可持续发展世界首脑会议提供的资料,联合国预计全球人口将增加到2025年的.87亿和2050年93亿,而未来的几乎所有人口增长均来自于发展中国家,随着人口的增长和人们生活水平的提高,土地、水资源、能源和其他自然资源将更加紧张,特别是在发展中国家,可能会引发空前的危机。

(1)2011年10月31日,世界人口数量已达______亿。

(2)人口自然增长率是由______________________决定的。

(3)人口增加过快带来的问题有:______(不少于3点)

【答案】70 出生率 死亡率 饥饿贫困,住房紧张,交通拥挤,就业困难等(符合题意即可)

【解析】

人口自然增长率=出生率-死亡率。人口增长过多过快带来问题:交通堵塞、居住条件差、就业困难、生活贫困、环境污染、资源减少等。采取措施:人类必须控制自己,做到有计划地生育,使人口的增长与社会经济的发展相适应,与环境资源相协调。

(1)从材料中可知,2011年10月31日,世界人口数量已达70亿。

(2)人口的自然增长率=出生率-死亡率,所以人口自然增长率是由出生率和死亡率决定的。

(3)人口增长会带来一系列的问题,如:饥饿贫困,住房紧张,交通拥挤,就业困难等,严重阻碍经济的发展,所以人口的增长与社会经济的发展相适应,与环境资源相协调。

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