84消毒液是一种有刺激性气味的高效液体消毒剂．主要成分为次氯酸钠（NaClO），广泛用于宾馆、旅游、医院、食品加工、家庭等的卫生消毒．请阅读信息并回答：

（1）次氯酸钠的制取原理是氯气与氢氧化钠反应生成氯化钠，次氯酸钠和水，化学反应方程式为　____ ；

（2）消毒液中次氯酸钠自身没有消毒作用，有消毒作用的是次氯酸钠与空气中二氧化碳反应得到的次氯酸（HClO），化学方程式为　____　；

（3）84消毒液是含氯消毒剂，氯气是一种挥发性的有毒气体，因此，84消毒液必须____保存．

    China has splendid culture with a long history. Chinese opera is one of the ____(old) dramatic art forms in the world.During the Tang Dynasty,the Emperor Xuanzong established an opera school ____ the poetic name Liyuan (Pear Garden). Since the Yuan Dynasty, encouraged by court officials and emperors, it____(become) a traditional art form. During the Qing Dynasty,____became fashionable among ordinary people. Performances ____(watch) in tearooms, restaurants, and even on temporary stages.

    It developed from folk songs, dance, talking, antimasque(滑稽戏) and especially distinctive dialectical music. Gradually it combined music, art and literature into one performance on the stage.____ (accompany) by traditional musical instruments, actors present unique melodies which may sound strange to ____(foreign) as well as beautifully written dialogues, which are of high literary ____(valuable). These dialogues also promoted the development of distinct literary styles, such as Zaju in the Yuan Dynasty. For Chinese, especially older folks,____ (listen) to this kind of opera occasionally is ____real pleasure.

雅典民主城邦的政治精英们在公民大会和法庭上表演时，凭借的主要手段是言辞。言辞在雅典具有很高的地位，这使得与言辞有关的演说术和修辞术在那里极为发达，各种演说和修辞策略源源不断地被开发出来，并应用于实际的政治表演。对此理解最正确的是（   ）