C

    I'm Sarah．I used to have little passion(激情)in my life．But what happened the other day changed my mind．It was then that I learned how important it is to have a passion in life．

    That day I went home in Mom's car．When Mom stopped at a red light．someone on the side of the road caught my eye．It was a man dressed in rags(衣衫褴褛)．He was homeless．That didn't interest me．because I had seen many people like him before．Those people usually looked unhappy and hopeless．

    But this man was different in some way．He was not sitting alone with a sad look．Instead，he had a radio in his hand and was dancing happy to the music．The radio seemed to be the most precious（珍贵的)thing he had．

    Mom，why does mat man have a radio though he' s homeless?”I asked．

    “Maybe he bought it，”she replied．

    “But why didn't he use the money to buy food or clothes ?He paid for something that he didn't need．”

    “Well, Sarah, sometimes food and clothes aren't me most important．''

That man must care so much about music that he bought a radio instead of food or clothes．I soon realized that happiness is the key to life．

Since then I am always thinking of what is truly important in life．A home，a meal，clothes—these things are only part of the life．What we often forget is that we all need a joy，a light on a dark day．We all need a passion which gives a person the happiness they need to keep going．

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假设李三是公元前3世纪中期秦国的商人，他会遇到哪些事情（   ）

①做生意时买卖公平．童叟无欺，获得政府奖励白银十两②从齐国贩卖纺织品到秦，在秦国被课以重税③在市场上出售纺织品没有明码标价而被重罚④生意亏本致家境贫寒，家人被政府罚为奴婢

在研究摩擦力的实验中，用弹簧测力计水平拉一放在水平桌面上的木块，木块运动状态及弹簧测力计的读数如下表所示（每次实验时，木块与桌面的接触面相同）则由此表分析可知（　　）