了解年龄构成的社会意义很重要，下列错误的是( )。
A．掌握学龄前儿童的数量和趋向是制定托、幼及中小学规划指标的依据
B．分析年龄结构，可以判断城市的人口自然增长变化趋势
C．分析育龄妇女人口的年龄及数量是推算人口自然增长的重要依据
D．计算劳动人口与非劳动人口占总人口的比例
参考答案：D
解析：了解年龄构成的意义包括：比较成年组人口与就业人数(职工人数)可以看出就业情况和劳动力潜力；掌握劳动后备军的数量和被抚养人口比例，对估算人口发展规模有重要作用；掌握学龄前儿童和学龄儿童的数量和趋向是制定托、幼及中小学等规划指标的依据；分析年龄结构，可以判断城市的人口自然增长变化趋势；分析育龄妇女人口的年龄及数量是推算人口自然增长的重要依据。
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| Many language learners think their pronunciation is good enough because their teacher doesn't correct them too often or because other students can __1_ them. Pronunciation is the area which is __2__ the least attention to in language learning. Most teachers __3__ just let their students speak and stop them __4__ they say something completely wrong. Working on each student's pronunciation in class is just __5__. Also, the students who are __6__ at pronunciation may be afraid that it will embarrass their classmates if they help __7__ their mistakes. If you believe your pronunciation is good enough to __8__ because it is good enough for your teacher and other students, you may be __9__ when you actually go to a foreign country. One of my friends was the best student in his __10 _ class in Poland. When he went to America, he found Americans didn't understand __11__ of what he said. Your pronunciation may still be quite __12 _ that of a native speaker. If this is the __13__, other people will find it __14__ to understand what you're saying and will not be comfortable with you. 15 , don't think you can communicate in a foreign language __16__ you've tested your skills on real native speakers. __17__ for native or nearnative pronunciation so that people you talk to can communicate with you __18__. In order to achieve this goal, there's __19__ that you will need to start thinking about pronunciation and __20__ time on it. | ||||
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