C

    Waste can be seen everywhere in the school. Some students ask for more food than they can eat and others often forget to turn off the lights when they leave the classroom. They say they can afford these things. But I don't agree with them.

    Waste can bring a lot of problems. Although China is rich in some resources, we are short of others, for example, fresh water. It is reported that we will have no coal or oil to use in 100 years. So if we go on wasting our resources, what can we use in the future and where can we move? Think about it. I think we should say no to the students who waste things every day. Everybody should stop wasting as soon as possible.

    In our everyday life, we can do many things to prevent waste from happening, for example, turn off the water taps when we finish washing, turn off the lights when we leave the classroom, try not to order more food than we need, and so on. Little by little, everything will be changed. Waste can be stopped one day, if we do our best.

材料：李斯，生于战国末年的楚国，年轻时师从荀子学习帝王之术。学成之后来到秦国，被秦王任命为客卿（在本国担任官员的他国人）。当时韩国人郑国以修筑渠道为名，来到秦国做间谍，不久被发现。许多大臣向秦王谏言要把秦国的客卿一概驱逐，李斯也在驱逐之列。于是李斯上书说：“陛下您排斥客卿而使他们为其他诸侯国建立功业，使天下有才之士不敢进入秦国，这是借武器给敌人。”于是，秦王废除了逐客令，并提拔李斯为延尉。二十多年后，秦国统一天下，李斯被任命为丞相。秦朝初年有大臣建议恢复分封制，李斯坚决反对，他认为郡县更有利于君主控制和国家稳定。李斯还提出民间任意批评朝廷的法令制度，会导致君主权力威望下降，除了医药、占卜、种植等书，应该把《诗》、《书》及诸子百家著作清除干净，秦始皇采纳了他的建议。

——据《史记·李斯列传》