题干

守护生命,首先要(  )

A:关注自己的身体

B:掌握自救的知识

C:养护自己的精神

D:守护精神家园

上一题 下一题 0.0难度 选择题 更新时间:2015-03-12 09:53:55

答案(点此获取答案解析)

A

同类题2

阅读理解。

        Two things changed my life: my mother and a white plastic bike basket. I have thought long and hard about it and it's true. I would be a different person if my mom hadn't turned a silly bicycle accessory into a life lesson I carry with me today.

        My mother and father were united in their way of raising children, but it mostly fell to my mother to actually carry it out. Looking back, I honestly don’tknow how she did it. Managing the family budget must have been a very hard task,but she made it look effortless. If we complained about not having what another kid did, we’d hear something like, “I don’t care what so –and –so got for his birthday, you are not getting a TV in your room a car for your birthday a lavish sweet-16 party.” We had to earn our allowance by doing chores around the house. I can still remember how long it took to polish the legs of our coffee table. My brothers canno doubt remember hours spent cleaning the house .Like the two little girls growing up at the White House, we made our own beds (no one left the house until that was done) and picked up after ourselves. We had to keep track of our belongings, and if something was lost, it was not replaced.

        It was summer and ,one day ,my mother drove me to the bike shop to get a tire fixed---and there it was in the window, White, shiny, plastic and decorated with flowers ,the basket winked at me and I knew ----I knew---I had to have it.

       “It's beautiful,” my mother said when I pointed it out to her,” What a neat basket.”

       I tried to hold off at first, I played it cool for a short while. But then I guess I couldn't at and it any longer: “Mom, please can I please, pleaseget it? I‘ll do extra chores for as long as you say, I'll do anything, but I need that basket, I love that basket. Please, Mom .Please?”

         I was desperate.

      “You know,” she said, gently rubbing my back while we both staredat what I believes was the coolest thing ever,” If you save up you could buy thisyourself.”

     “By the time I makeenough it’ll but gone!”

      “Maybe Roger here could hold it for you,” she smiled at Roger, thebike guy.

      “He can’t hold it for that long, Mom. Someone else will buy it .Please,Mom, Please?”

      “There might be another way,” she said.

      And so our paying plan unfolded. My mother bought the beautiful basket and put it safely in some hiding place I couldn't find. Each week I eagerly counted my growing saving increased by extra work here and there (washing the car ,helpingmy mother make dinner, delivering or collecting things on my bike that already looked naked  without the basket in front).And then ,weeks later ,I counted ,re-counted and jumped for joy. Oh, happy day! I made it! I finally had the exact amount we’dagreed upon….

       Days later the unthinkable happened. A neighborhood girl I'd played with millions of times appeared with the exact same basket fixed to her shiny, new bike that already had all the bells and whistles. I rode hard and fast home to tell my mother about this disaster. This horrible turn of events.

And then came the lesson. I've taken with me through my life: ”Honey,Your basket is extra-special,” Mom said, gently wiping away my hot tears.” Yourbasket is special because you paid for it yourself.”

同类题5

阅读下文,回答问题

鲨鱼是海洋系统的“整容师”

柳静

    ①鲨鱼是海洋中的庞然大物,也是食肉类的凶猛鱼类,号称“海中狼”。可是,最近它被贴上了“整容师”的标签,因为它可以改变海洋中很多鱼的眼睛和尾鳍的尺寸。听到这些,你是否感到十分惊讶呢?

    ②原来,在海洋系统中,许多小鱼都有着较大的眼睛和有力的尾鳍,帮助它们及时发现并快速躲避鲨鱼的攻击与吞食。尤其在鲨鱼出没捕食的低光环境下更是如此:一定尺寸的尾鳍可以保证鱼类突然加速游动,以此来远离鲨鱼的追捕。但是,在2018年1月,西澳大利亚大学等机构研究人员的最新研究发现,近年来由于人类对鲨鱼的大量猎杀,导致多种鲨鱼濒临灭绝。鲨鱼数量的减少,使得其他鱼类的生存得到了暂时的和平安稳,导致它们的形态也正在发生明显的改变,如眼睛变小,尾鳍变小。因此,鲨鱼就成了海洋系统里的“整容师”。

    ③研究人员对澳大利亚西北海域罗利沙洲和斯科特礁两个珊瑚礁系统中7种不同的鱼类专门进行了对比分析。这两个珊瑚礁有着相似的自然环境,但不同的是,罗利沙洲禁止捕鱼,鲨鱼数量比较稳定,而斯科特礁允许对鲨鱼进行商业捕捞,且已经特持续了一百多年。研究人员分别在两个珊瑚礁海域进行了采样捕捞,并测量出了所捕捞鱼的体长、体宽、眼部和尾鳍大小。结果发现,与罗利沙洲的鱼类相比,斯科特礁同种鱼类的眼睛尺寸小46%,尾鳍尺寸小40%

    ④研究人员解释说,人类捕捞鯊鱼使其数量减少,会造成一系列生态后果,小鱼的的眼睛及尾鳍尺寸等发生变化仅仅是一个方面,其实,鲨鱼数量的减少还在悄悄地影响着其他海洋生态系统。

    ⑤首先,鲨鱼数量的大幅度减少,那些体弱多病,基因突变导致畸形的鱼,就不会及时被消灭,进化过程中的优胜劣汰也不能更好地延续下去。那些没有被吃掉的弱鱼,病鱼就会一直繁殖下去,直到基因退化,这不利于种群的健康发展,对整个海洋生物多样性,优化性将是一个致命打击。

    ⑥其次,鲨鱼数量的大幅度减少,将使海洋生态环境无法正常维持,水质环境会进一步恶化。因为,鲨鱼是海洋系统名副其实的“清道夫”。它可以通过清理腐烂的大型海洋动物尸体,来净化海洋生态环境。

    ⑦由此看来,鲨鱼在保持海洋生态系统平衡中扮演了至关重要的角色,称它为海洋系统的“整容师”一点儿也不为过。

(选自《知识窗》,2018年第4期,有删改)