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分析前阶段质量保证的主要目的是保证检验结果的（）

A.准确性

B.重复性

C.再现性

D.稳定性

E.反映患者当前病情的真实性

以分班、分组为根本目的的测验是( )

A．安置性测验
B．形成性测验
C．总结性测验
D．诊断性测验

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

我们邮政是企业，所以在向客户推介业务时，要以发展业务为导向，想方设法促成客户对高资费业务的使用。

到目前为止，全世界已在各个地质层位中发现了油气藏，最远的是（）。

A.第三纪

B.白垩纪

C.第四纪

D.震旦纪