巴黎公社形成了异于“三权均衡”的“人民监督”这一新型的权力制约机制。在马克思看来，公社的“人民监督”像一个“倒金字塔”结构，与人民选举的正“金字塔”结构形成了权力对称，有效地防止了官僚腐败和权力失衡。这表明巴黎公社（   ）

如果把自然水里溶解的气体收集起来，分析的结果是氧气的体积分数大于21%，而氮气的体积分数小于78%，此现象说明____ 

①直线 $AB$ 和直线 $BA$ 是同一条直线；

②射线 $AB$ 与射线 $BA$ 是同一条射线；

③线段 $AB$ 和线段 $BA$ 是同一条线段；

④图中有两条射线.

    When I was in the ____ (九) grade, luckily, I was chosen to be the princess in the school play. For weeks my mother had helped me practice my lines. But ____ (一旦) on the stage, every word disappeared from my head. Then my teacher asked me to change my role to be a narrator (解说者) for the play.

    ____ (尽管) I didn't tell my mother what had happened that day, she noticed my unhappiness. She asked if I wanted to take a walk in the garden.

    It was a lovely spring day. We could see several dandelions (蒲公英) ____ (在…中间) the grass. I watched my mother bend down by one of the dandelions. "I think I'll dig up all these weeds (野草)," she said. "From now on, we'll only have roses in this garden."

    "But I like dandelions," I disagreed. "All flowers are beautiful-even dandelions!"

    My mother looked ____ (严肃地) at me. "Yes, every flower gives pleasure in its ____ (自己的) way, doesn't it?" she asked thoughtfully. I nodded. "And that is true of people, too," she added.

    When I ____(意识到) that she had guessed my pain, I started to cry and told her the ____ (真相). "But you will be a wonderful narrator," she said, reminding me of how much I loved to read stories aloud.

    Thanks to my mother's encouragement, I got to know everybody had his or her ____ (价值) in the world. I felt ____ (骄傲的) of the role in the play.