如图，已知反比例函数y= $\frac{2}{x}$ 的图象C与正比例函数y=ax（a≠0）的图象l相交于点A（1，m）和点B．

    A group of old classmates, who have succeeded in their work, got together to visit their teacher. The conversation soon turned to complaining about the stress in work and life. Offering his guests coffee, the teacher went to the kitchen and returned with a large pot of coffee and many cups-china(瓷),plastic and glass, some plain(朴素的）looking,some expensive and some lovely.The teacher told them to help themselves to the coffee.

    When all the students had a cup of coffee in hand, the teacher said,“Can you notice all the nice looking expensive cups were taken,leaving behind the plain and cheap ones? While it is normal for you to want only the best for yourselves, that is the source(根源）of your problems and stress.”

    “What all of you really wanted was coffee, not the cup, but you went for the best cups and were eyeing(注视)each other's cups.”

    “Now think about this：life is the coffee, and the jobs, money and position are the cups. They are just tools to hold life, and do not change the quality of life. Sometimes, we just care about the cups, and we fail to enjoy the coffee. So don't let the cups drive you, enjoy the coffee instead.

有学者认为，中国的经济形态，从先秦到汉初是贵族经济，演进到东汉至魏晋南北朝，成为世族经济，进入隋唐后，日渐呈现出“士商合流”的趋势，到宋代，终于定型为士绅经济。据此判断下列说法正确的是（   ）

请仔细阅读下列材料并结合所学知识，回答问题：

南京，中国历史文化名城，她亲眼见证了近代中国的兴衰荣辱。

材料一    这年8月的一天，清政府的代表被迫来到停泊在南京江面的英国军舰上，在一份对中国极不平等的文件上无奈地签下名字。中国近代百年的屈辱从此开始。

材料二    这是时间意义上一个新年的开始，更是历史意义上一个时代的开始。在那个元旦，“民国”取代了“帝国”，皇帝，也永远成为写在史书上的历史名词。

材料三    永远的历史警示——死难同胞300000人！下图一：日军在南京活埋中国平民

材料四    定格的历史一页——上图二：中华民国三十八年4月23日

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