已知反比例函数y=kx的图象与直线y=x+1都过点（-3，n）（1）求n，k的值

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.

According to this passage, the status of the aged is lowered by their ______.

A．forced retirement

B．inferior housing

C．longer life span

D．fixed incomes

— What do you think of the concert?

— There was nothing special; it was only ________.[    ]

A. average  

B. usual

C. normal  

D. common

不能用单质与氯气直接化合制取的物质是（　　）

A．NaCl

B．FeCl₂

C．FeCl₃

D．CuCl₂

根据《跟单信用证统一惯例》的规定，信用证上如果未规定有“可转让”条款，这个信用证即可视为( )。

A．可转让信用证

B．不可转让信用证

C．可部分转让信用证

D．可由开证人决定