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    Computers are useful machines.They can help people a lot in their daily life . For example,they can help people to save much time to do much work,and they can help people to work out many problems easily.Our country asks everyone to learn to use computers before the twenty-first century,except the old people.

    Today more and more families own computers . Parents buy computers for their children.They hope computers can help them improve their studies in school.Yet,many of their children use computers to play games,to watch videos or to chat.Computers can not help children to study but make them fall behind.So computers are locked in boxes by parents.

    In some other countries,even some scientists also hate computers.They say computers let millions of people lose their jobs or bring them a lot of trouble.Will computers really bring trouble to people or can they bring people happiness? It will be decided by today's students themselves!

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蚂蚁的本领

    ①早在人类诞生之前,蚂蚁就会修筑“公路”。亚马逊雨林中的蚁类,为躲避狂风暴雨,在树干上啃出一条条凹槽,或在平地用沙砾修筑成沟槽,作为它们的公路;蚂蚁是列队行进的,为解决相对而行或十字路口的交通阻塞问题,它们竟然能“设计”出类似立交桥的环形交叉路口。②蚂蚁的神经系统并不发达,然而它们一旦成为一个整体时居然能够思考、筹划、谋算,成为一部活计算机。它们无需图纸,也没有指挥和监理,但竟能齐心合力地设计并建造成五花八门、奇形怪状的蚁丘。蚁丘的内部布局合理,空气畅通,温度恒定,各种设施齐备,其工程浩大令人惊叹:有上百个蚁丘相通,可长达数十米;有的如“摩天大楼”拔地而起,最高的可达6米,按其身高的比例,相当于人类___层的摩天大厦。蚂蚁王国的这般工程往往需要十余年的艰辛劳作,而工蚁的寿命不过两年,也就是说,需要几代蚂蚁的努力方可大功告成。天知道,它们是怎样保持一致的。③据考证,蚂蚁早在5000万年前就完成了类似人类的从“狩猎”到“农耕”的转变。现在地球上约有二百余种蚂蚁都有种植蘑菇类真菌的本领。它们不但懂得施肥、收割,还懂得利用树叶发酵产生的热量来保持真菌园的恒定的温度和湿度,甚至当它们种植无收时还会向邻居借贷!