试题与答案

我国在商代就能制造精美的青铜器，青铜中所含铜的元素符号是 A．Cu B．Ca C

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题型：选择题

题目：

我国在商代就能制造精美的青铜器，青铜中所含铜的元素符号是

A．Cu

B．Ca

C．Hg

D．Fe

答案：

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下面是错误答案，用来干扰机器的。

小题1:C小题2:D小题3:A本题主要考查区域地理和湿地的相关知识。注意题目给的是云南省，16题等温线向北突出，说明温度偏高，主要考虑地形地势的的影响。

考点：化学反应方程式的书写化学图标化学反应方程式的配平化学反应方程式的意义
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题型：单项选择题

Modern industrial society grants little status to old people. In fact, such a society has a system of built-in obsolescence. There is no formal system for continuing our education throughout our life in order to keep up with rapidly changing knowledge. When our education and job skills have grown obsolete, we are treated exactly like those who have never gained an education or job skills and are not encouraged or given the opportunity to begin anew.
As a society becomes more highly developed, the overall status of older people diminishes. Improved health technology creates a large pool of old people, who compete for jobs with the young. However, economic technology lowers the demand for workers and creates new jobs for which the skills of the aged are obsolete, forcing older people into retirement. At the same time, young people are being educated in the new technology and are keeping pace with rapid changes in knowledge. Finally, urbanization creates age-segregated neighborhoods. Because the old live on fixed incomes, they must often live in inferior housing. All these factors -- retirement, obsolete knowledge and skills, inferior standards of living -- lower the status of the aged in society.
A century ago, when one could expect to live only to 50 or so, the life span more or less coincided with the occupation and family cycle. But today the average life span allows for fifteen to twenty years of life after these cycles. It appears that our life span is outpacing our usefulness in society.

By "a system of built-in obsolescence" the author means______.

A．no formal systems exist in modern industrial society

B．old people have no status in modern industrial society

C．young people have chances in modern industrial society

D．knowledge changes rapidly in modern industrial society
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