[定稿]人教版五年级上册语文拼音课文9《鲸》

《[定稿]人教版五年级上册语文拼音课文9《鲸》》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、9《鲸》bushaorenkanguoxiangdoushuoxiangshihendadeclongwu不少人看过象，都说象是很大的动物。q1sh1haiyoubIxiangdadeduddedongwunajiushijingmuqian其实还有比象大得多的动物，那就是鲸。目前yIzhizuidadejingyueyoushiliuwangOngjlnzh6ngzuixiaode已知最大的鲸约有十六万公斤重，最小的yeyouliangqiangongjlnwoguofaxianguoyitousiwangongjln也有两千公斤。我国发现过

2、一头四万公斤zhdngdejingvueshiqlmIchangyItiaoshetoujiuyoush1jItou重的鲸，约十七米长，一条舌头就有十几头dafeizhunamezhongtayaoshizhangkaizuirenzhanzaitazui大肥猪那么重。它要是张开嘴，人站在它嘴1IjuqIshoulaihaimdbudaotadeshanges1gerenweizheburudongwuzaihenyuandegudaijlngdezuxiangenniuyangde哺乳动物。在很远的古代，鲸的祖先跟牛羊的里，举起手来还摸不到它

3、的上腭，四个人zhuozizuozaitadezui1ikanshu桌子坐在它的嘴里看书，haixiandehenkuanchang还显得很宽敞。jlngshenghuozaihaiyang1I鲸生活在海洋里，yInweitIxingxiangyu因为体形像鱼，xuduorenguantajiaojingyu许多人管它叫鲸鱼。qishitabushuyuyuleiershi其实它不属于鱼类，而是zuxianyiyangshenghudzdi1ud1shanghoulaihuanjingfasheng祖先一样，生活在陆地上。后来环境发生1ebia

4、nhuajlngdezuxianshenghuozaikaojin1ud1deqian了变化，鲸的祖先生活在靠近陆地的浅houzhlwanquantuihua后肢完全退化hai11youjlnggu61ehenchdnghenchangdeniandaitamende海里。又经过了很长很长的年代，它们的前肢和尾巴渐渐变成了鳍qianzhlheweibajianjianbianchengleqI1czhenggeshenzicheng1cyudeyangzishiyinglehaiyangde了，整个身子成了鱼的样子，适应了海洋的shenghud

5、生活。jlngdezhongleihenduozongdelaishudkeyIfenwei1iang鲸的种类很多，总的来说可以分为daleiyIleishixujlng大类：一类是须鲸，meiyouyachiy1leishichijlng没有牙齿；一类是齿鲸，youfenglideyachl有锋利的牙齿。jlngdeshenzizhOmedatamenchlshQnmenexujlng鲸的身子这么大，它们吃什么呢？须鲸zhuyaochlxiahexiaoyutamenzaihaiyanglIyoudeshihou主要吃虾和小鱼。它们在海洋里游

6、的时候，zhangzhedazulbaxududxiaoyuxiaoxialiantonghaishuiy1q1张着大嘴，把许多小鱼小虾连同海水一齐xIjinzul1Iranhoubishangzuibahaishuicongxubanzhongjian吸进嘴里，然后闭上嘴，把海水从须板中1uchulaibaxiaoyuxiaoxiatunjinduzi1IyTdunjiukeyI滤出来，把小鱼小虾吞进肚子里一顿就可以chi1idngqianduOgOngjinchijingzhuyaochldayuhehaishou千多公斤。齿鲸主要吃大鱼和

7、海兽。tamenyudaodayuhehaishoujiuxiongmengdipushangquyong它们遇到大鱼和海兽，就凶猛地扑上去，用I>1/1vv111v—111—changchanghaojishitou常常好几十头fenglideyachiyaozhuhenkuaijiuchidiaoyouy1zhonghaocheng锋利的牙齿咬住，很快就吃掉。有一种号称“海中之虎”的虎鲸，haizhongzhihudehujingjiechengyiqunweizhuyitousanshiduodunzhongdechangxujing结

8、成一群，围住一头三十多吨重的长须鲸，jigexiaoshijiunengbatachlguang几个小时就能把它吃光。zheyeshudmingtaj