【題目】閱讀下列材料,回答問題。

世界人口數(shù)量已經(jīng)從1950年的25億和1980年的44億猛增到1999年10月12日的60億。據(jù)可持續(xù)發(fā)展世界首腦會(huì)議提供的資料,聯(lián)合國預(yù)計(jì)全球人口將增加到2025年的.87億和2050年93億,而未來的幾乎所有人口增長均來自于發(fā)展中國家,隨著人口的增長和人們生活水平的提高,土地、水資源、能源和其他自然資源將更加緊張,特別是在發(fā)展中國家,可能會(huì)引發(fā)空前的危機(jī)。

(1)2011年10月31日,世界人口數(shù)量已達(dá)______億。

(2)人口自然增長率是由______________________決定的。

(3)人口增加過快帶來的問題有:______(不少于3點(diǎn))

【答案】70 出生率 死亡率 饑餓貧困,住房緊張,交通擁擠,就業(yè)困難等(符合題意即可)

【解析】

人口自然增長率=出生率-死亡率。人口增長過多過快帶來問題:交通堵塞、居住條件差、就業(yè)困難、生活貧困、環(huán)境污染、資源減少等。采取措施:人類必須控制自己,做到有計(jì)劃地生育,使人口的增長與社會(huì)經(jīng)濟(jì)的發(fā)展相適應(yīng),與環(huán)境資源相協(xié)調(diào)。

(1)從材料中可知,2011年10月31日,世界人口數(shù)量已達(dá)70億。

(2)人口的自然增長率=出生率-死亡率,所以人口自然增長率是由出生率和死亡率決定的。

(3)人口增長會(huì)帶來一系列的問題,如:饑餓貧困,住房緊張,交通擁擠,就業(yè)困難等,嚴(yán)重阻礙經(jīng)濟(jì)的發(fā)展,所以人口的增長與社會(huì)經(jīng)濟(jì)的發(fā)展相適應(yīng),與環(huán)境資源相協(xié)調(diào)。

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