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问题 单项选择题

福建霞浦县某鸡场出现病鸡精神沉郁、呼吸困难、咯血现象。个别雏鸡突然死亡，死前口流鲜血。发病中鸡和大鸡的鸡冠苍白、消瘦、拉水样的白色或绿色稀粪、产蛋率下降，且产畸形蛋和软壳蛋。剖检最明显病变为皮下出血，胸肌、腿肌、心肌、肌胃、腺胃以及肠黏膜均有大小不等的出血点，并见灰色的小结节。将小结节挑出涂片染色，可见许多裂殖体散出。由此我们可以初步判定为( )。

A．鸡传染性法氏囊病

B．鸡住白细胞虫病

C．鸡血痢

D．鸡新城疫

E．鸡球虫病

答案

参考答案：B

单项选择题

下列说法不正确的是（）。

A.海水的开发、利用、保护和管理遵循我国《水法》规定

B.开发利用水资源，应当首先满足城乡居民生活用水

C.围垦河流必须经过科学论证，并经省级以上人民政府批准

D.我国的水资源属于全民所有
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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.

Which of the following would be the best title for this passage

A．The Problem of Aging

B．Social Structures

C．Economic Technology

D．Continuing Education
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