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问题 单项选择题

近年来，我国在大力吸引外资的同时，越来越多的企业开始“走出去”到海外投资。这可以（）

①更好地参与国际经济技术合作与竞争

②减少我国国际贸易摩擦

③在更大范围内优化资源配置

④巩固我国在国际经济中的主导地位

A.①②④

B.②③④

C.①②③

D.①③④

答案

参考答案：C

问答题 简答题

什么是材料的力学性能？材料的力学性能主要有哪些？
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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.

The sentence "our life span outpaces our usefulness" means we can live longer________.

A．and make progress

B．and do more work

C．but move slowly

D．but become useless
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