题目内容

【题目】 “人口年龄中位数”指将全体人口按年龄大小的自然顺序排列时居于中间位置的人的年龄数值。“年龄中位数”的大小可以反映用来表示一个国家(地区)人口的年老或年轻的程度。读“2018年世界年龄中位数图”。

完成下面小题。

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1读上图,以下结论可信的是( )

A. 北美洲是世界上最年老的大洲B. 非洲是世界上最年轻的大洲

C. 欧洲是世界上最年轻的大洲D. 大洋洲比南美洲更年轻

2最年轻的大洲目前所面临的主要问题有( )

①人口老龄化严重

②需要实施计划生育

③面临就业困难、资源短缺等问题

④社会养老 压力巨大

⑤医疗教育压力大

⑥需开放二胎鼓励生育

A. ①③⑤B. ③⑤⑥

C. ②③⑤D. ③⑤⑥

【答案】

1B

2C

【解析】

目前世界人口已超过70亿,其中绝大多数生活在发展中国家。发达国家人口出生率下降,发展中国家人口猛增,自20世纪60年代起发达国家就出现了人口增长率下降的趋势,而发展中国家人口增长率呈上升趋势。
世界人口的年龄结构两极分化,发达国家面临人口老龄化问题,而发展中国家的人口年轻的多,有生育能力的人多,这就决定了发展中国家今后的人口还要持续增长。

1依据图文人口年龄中位数可知,欧洲是世界上最年老的大洲,故A、C错误;非洲是世界上最年轻的大洲,故B正确;大洋洲比南美洲更老龄,故D错误;依据题意,故选:B。

2最年轻的大洲说明人口自然增长快,新生人口多,需要实施计划生育,控制人口增长;人口年轻化将面临就业困难、资源短缺、医疗教育压力大等问题;故选项②③⑤正确,故选:C。

本题考查了世界人口的分布及问题。

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Some inventions are just fun.A company in a foreign country has invented ____ flowers.You can listen to music that comes through real flowers.Customers in restaurants can smell the beautiful roses_____ listen to pleasant music while eating.People in the dentist’s office can look at pretty lilies and listen to Mozart while having their______examined!

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A new kind of bubble liquid has been invented.If you blow bubbles ____ this liquid,they can last for several minutes. ____ are very strong.You can even pick them up and throw them around.

Do you have your own ideas about inventions now?

1A. bike B. bus C. ship D. plane

2A. important B. useless C. boring D. strange

3A. dancing B. talking C. singing D. walking

4A. but B. so C. nor D. and

5A. ears B. eyes C. teeth D. nose

6A. in all B. at all C. after all D. for all

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9A. about B. at C. with D. for

10A. They B. We C. You D. None

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