题干

在右图所示的过程中,哪一事件在2~11阶段没有发生

A:细胞体积减小

B:细胞会逐渐衰老

C:细胞有丝分裂

D:细胞分化

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答案(点此获取答案解析)

B

同类题3

阅读理解

    “There's a mother in PICU(儿童重症监护病房)who wants to talk about a kit she received,” the nurse told me. “Something about it made her cry.”

    I've been a child-1ife specialist at the Cleveland Clinic Children's Hospital since 2000. I help families understand diagnoses and treatment plans and manage the ups and downs that come with caring for a sick child. Tough talks with parents are part of the job, which still makes me feel nervous.

    The kits the nurse was talking about were something I had recently introduced to the hospital: Comfort Kits from Guideposts. They were supposed to make a child's experience here easier, not upsetting.

    When I came across the kits at a conference. I fell in love with them. A treasure box of items designed not only to entertain kids, but to comfort and inspire them. There's a coloring book, a stress ball, a CD of relaxing music, a hairy star named Sparkle, a journal and much more. I really believed these kits would help kids. I wished I hadn't been mistaken.

    At the patient's room in PICU I saw a little girl, sleeping soundly, surrounded by tubes and machines. My eyes met her mother's. The kit was open on her lap and tears were running down her cheeks.

    “I'm Shannon. I manage the Child Life Department.” I said. “I'm sorry if the kit upset you .It's a new item…”

    The mother shook her head. “This has been one of the worst days of my life .I felt so scared and alone. Then I was handed this box. I know it's for my daughter, but it's just the comfort I needed. I wanted to say thank you.”

    With that I knew Comfort Kits belonged here. We've been using them for almost three years now. Each child who's admitted to the hospital receives one. Every day I see kids coloring, journaling, playing with Sparkle.

    But as this mom showed me Comfort Kits aren't just for kids. The hope they bring, which can be in short supply in hospitals sometimes, is felt by the whole family.

同类题4

阅读理解。

生命的本质

       夜幕降临,对门那家又传出熟悉的和生疏的音乐,响起时紧时缓的舞蹈脚步。

       那是一对才搬来的残疾夫妻,男的一双脚掌向后撇,女的是哑巴。那天初次见到他们时,一股怜悯之情在我心头升起;这样的人生,这样的家庭,该怎样艰难!这不是我鄙视他们,我认为作为一个正常人,是应该有一点这样的怜悯之心的。

       但接下来的事实让我大吃一惊,这些天来,他们的那些残疾人朋友络绎在夜幕之后前来集会,空气里传来他们的音乐、舞蹈和欢笑。我看不到他们的表情,但我可以感觉到他们的舞蹈火一般忘情、热烈。

       面对着这样的一群人,我感到世上所有的词汇变得苍白、不贴切。说残疾人也爱生活,也需要音乐和舞蹈.这样的解释是那么的无力、词不达意。只有用火的舞蹈,才恰如其分。火在舞蹈,那扭动、变形的舞姿是火的生命张力的表达。燃体在火的舞蹈中发出毕毕剥剥的吟唱,燃体不尽,火的舞蹈不停。

       熟悉的和陌生的音乐像一支焰火,一下子照亮了我记忆的天空。我透过遥远岁月重又看到生命在另一种形式下的舞蹈:那是在一座简陋的砖瓦窑,我三十年前下放劳动的地方。窑师傅的小女儿才七八岁,就 开始帮大人做事了。这个小姑娘一身衣服缀满补丁,正当读书和游戏的年龄,就过早地承担了生活的艰辛。当时我也以怜悯的目光注视这个小女孩,但艰辛的劳动在小女孩身上却成了舞蹈,她蹦蹦跳跳,舞着工具,全无一点悲愁。她一下子就让我陷入对生命的沉思和叩问:生命的本质是什么?是什么让生命以这 样欢乐的形式前行的?

       用童心无邪,用不谙世事,用乐观主义来解释都是不够的。上苍仿佛有意安排,让我看到不同形式的两次生命的舞蹈。生命从一降生,就穿上了一双红舞鞋。这是生命的本质,是人在任何艰难困苦的情况下都会歌唱、都会欢乐的原因。

       人类的生命史穿越了数千年,其间战争、灾难、病痛、死亡都阻挡不了生命欢乐的舞蹈,废墟上一次又一次出现辉煌的殿宇。灾难之后,人类又一代代繁衍生息。没有畏惧,从不悲观,生命就这样一路舞着唱着前行,这一切都因为生命的本质就是舞蹈。