题干

(2009年宁夏理综)下列对于神经兴奋的叙述,错误的是(  )

A:兴奋部位细胞膜两侧的电位表现为膜内为正、膜外为负

B:神经细胞兴奋时细胞膜对Na通透性增大

C:兴奋在反射弧中以神经冲动的方式双向传递

D:细胞膜内外K、Na分布不均匀是神经纤维兴奋传导的基础

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C

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    Once upon a time, a daughter complained to her father that her life was unhappy and that she was tired of struggling all the time.

    Her father, a chef, took her to the kitchen. He filled three pots with water and placed each on a high fire. Once the three pots began to boil, he placed potatoes, eggs and coffee beans in them. After 20 minutes, he took them out, putting the potatoes and eggs in a bowl and the coffee in a cup. Turning to his daughter, he said, “Look closer, and touch the potatoes.” She did and noted that they were soft. He then asked her to take an egg and break it. After pulling off the shell, she observed the hard-boiled egg. Finally, he asked her to taste the coffee. Its good smell brought a smile to her face.

    “Father, what does this mean?” she asked. He then explained that the potatoes, the eggs and the coffee beans were in the same adversity (逆境)—the boiling water. However, each one reacted differently.

    The strong and hard potato became soft and weak in boiling water. The egg was fragile, with the thin outer shell protecting its liquid until it was put in the boiling water. Then the inside of the egg became hard. However, the coffee beans were unique. After they were exposed to the boiling water, they changed the water and created something new. “Which one do you want to be like?” he asked. “When adversity knocks on your door, how will you respond?”

    In life, challenges happen to us all, but the only thing that truly matters is what happens within us.