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      《耐渴的骆驼》四年级阅读练习题

      试题 时间:2019-08-17 我要投稿
      【www.dnfdy.com - 试题】

        一望无际的荒漠里,阳光晒得沙粒滚烫,骆驼却可以忍饥耐渴地走着,走着。它半个月不喝水,体重减轻100公斤,仍能驮着200公斤以上的货物,不停地走着。据观察,它可以三四个月不饮水,只吃一些青饲料。

        骆驼耐渴的秘密在哪里呢?

        有人曾以为,一定是它那驼峰里贮存着水。但是科学家解剖下来,发现驼峰里尽是脂肪,根本没有水。当然,脂肪在体内氧化后,会产生一些水,但是脂肪终究还不是水。又有人认为,骆驼一定是有个专门贮放水的胃?蒲Ъ医馄氏吕,也没有发现这样的胃。那么,秘密到底在哪里呢?

        原来,骆驼排汗和排尿很少,呼吸次数很多,又不?,这就使它每天散失的水分很少。即使骆驼多天不饮水。失去的水分达到体重的四分之一,看上去骨瘦如柴,可它身体的各部分仍能照常新陈代谢,不会影响生存。而人如果脱水百分之三十,就会疲惫不堪,甚至死亡。

        骆驼还有灵敏的鼻子,能嗅出1。5公里外埋在沙丘下的水源。当它找到了水源,在20分钟内,能一次喝下100公斤的水,使体重马上恢复正常。它把喝下的水,贮放到身体的各个部位里,这样就可以几天甚至半个月不喝水了。

        1、给下面加粗的字注音。

        荒漠滚烫贮存解剖不堪

        2、骆驼可以多长时间不喝水?

        3、根据文章内容判断正误。

       。1)骆驼的驼峰里贮存着水。

       。2)骆驼体内有一个专门贮存水的地方。

       。3)骆驼是一种非常耐渴的动物。

        4、骆驼耐渴的秘密是什么?

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