阅读下文，完成下列小题。

                                                                                                       军号声声

    ①“军号一响，那士气就鼓起来了，战士们就往前猛冲。在冲锋号的鼓动下，不久就冲上了阵地，消灭了敌人，我军胜利了。”我刚到村口，就被这位满面红光的老人充满激情的话语吸引了过去，他有八十多岁的样子，站立都不稳，可话语声还很洪亮。周围那几位和他年纪相仿的老人，都很麻木的样子，任他自言自语，谁也没有接这个话茬。

    ②我们全家搬走这么多年后，我突然生出回来看看的念头，没想到在村口遇到的第一个人竟然是他，他对那把铜号还是那么有感情。

    ③小时候，我对这把铜号是很羡慕的。不能亲手摸一摸、仔细看一看，总感到很遗憾。

    ④他的这把铜号，其实是有破损的，喇叭口处残缺一块，从这个地方向里还有一道裂纹。他每天都悉心呵护着，用一块纱布仔细擦拭，特别是到破损处时，会格外轻。

    ⑤擦完后，他就把铜号横过来，在眼前轻轻转动着，转完一圈，看擦得行了，就抬起头来，郑重地用右手握起来，举到眼前，右眼对铜号嘴儿认真看去，然后挪到左眼前，右眼眯起来，用左眼看一会儿，然后才慢慢放到自己嘴唇前。我们以为他就要吹响这把铜号了，可他总是让铜号和嘴唇似接触又不接触的，最终也没有吹响。

    ⑥我们都很失望，几乎异口同声地发出失望的长叹：“唉——”

    ⑦这时，他才会转过头来，看我们一眼：“怎么，想看看？”

    ⑧我们凑上前去。他把铜号在我们眼前晃了晃，然后陷入沉思，轻轻地说：“我的战友正吹着冲锋号，敌人的炮弹就打过来。”停一停，喉结滚动了几下，又接着说：“他就牺牲了，铜号也炸成了这个样子。”他轻轻地抚摸着，眼中有些光亮闪动着。他神情怔怔的。“战友牺牲后，这把号就再也没有吹响过，但其实它是整天响着的。”说到这里，他会把铜号的喇叭口放在耳朵边，认真倾听。不一会儿，左脚就开始一点一点的，好似铜号真的响了，他是在配合着那节奏似的。过了半天，他把那已经破损的喇叭口伸向我们：“你们听，声音真响亮。”

    ⑨我第一个凑上前去，歪着头，让自己的耳孔尽量对准铜号，仔细地听着。除了风偶尔滑入号管发出一丝嗡嗡声外，其余什么也听不到。

    ⑩他生气地把手一挥：“去去去，不中用的小毛孩子！”

    ⑪我发现，周围几位老人对他的说法也都不认同。甚至说他脑子在战场上被震伤了，留下了毛病。

    ⑫想不到，二十多年过去了，他对铜号依旧这么痴情。我看到破损之处的断茬显得更黑了，有些地方析出细密的小米粒大小的绿色斑点，裂缝的颜色也显得更深了，其余的地方一如既往地锃亮放光。看来这些年他一直没有停止过认真地擦拭维护。

    ⑬他见我这么认真地看着，浑浊的眼中似有火苗跳动了一下。“我知道，只要对着耳朵听，就能听到军号声声，连续不断，很响亮的。”我庄重的神情，引起了周围几位老人的注意。

    ⑭他也神情一振，脸上有了笑意，小心翼翼地把手伸过来，让铜号的喇叭口对着我，我赶紧歪歪头，凑过耳朵，认真地听着。另外几个老人围上前来，惊奇地问道：“真听到了？”

    ⑮我庄重地告诉他们：“是的，听到了。”

    ⑯那几位老人木然地看着我。

                                                                  （文/高军，有删改）

已知y= $\sqrt{1-8x}$+$\sqrt{8x-1}$+2，求$\sqrt{\frac{x}{y}}$+$\sqrt{\frac{y}{x}}$﹣2的值．

一辆汽车以10m/s的速度匀速前进，制动后，加速度为2.5m/s²，问：3s后的位移、10s后的位移．

    Perhaps you think you could easily add to your happiness with more money. Strange as it may seem, if you're unsatisfied, the issue is not a lack of means to meet your desires but a lack of desires—not that you cannot satisfy your tastes but that you don't have enough tastes.

    Real riches consist of well-developed and hearty capacities (能力) to enjoy life. Most people are already swamped(淹没) with things. They eat, wear, go and talk too much.They live in too big a house with too many rooms, yet their house of life is a deserted hut.

    Your house of life ought to be a mansion (豪宅) , a royal palace.  Every new taste, every additional interest, every fresh enthusiasm adds a room.  Here are several rooms your house of life should have.

    Art should be a desire for you to develop simply because the world is full of beautiful things. If you only understood how to enjoy them and feed your spirit on them, they would make you as happy as to find plenty of ham and eggs when you're hungry.

    Literature, classic literature, is a beautiful, richly furnished room where you might find many an hour of rest and refreshment. To gain that love would go toward making you a rich person, for a rich person is not someone who has a library but who likes a library.

    Music like Mozart's and Bach's shouldn't be absent. Real riches are of the spirit. And when you've brought that spirit up to where classical music feeds it and makes you a little drunk, you have increased your thrills and bettered them. And life is a matter of thrills.

    Sports, without which you remain poor, mean a lot in life. No matter who you are, you would be more human, and your house of life would be better supported against the had days, if you could, and did, play a bit.

    Whatever rooms you might add to your house of life, the secret of enjoying life is to keep adding.