根据短文理解，选择正确答案。

    Throw out the bottles and boxes of drugs in your house. A new theory suggests that medicine could be bad for your health. This new theory argues that healing (the process of becoming healthy and strong again) is at our fingertips: we can be healthy by doing Reiki on a regular basis.

    Supporters of medical treatment argue that medicine should be trusted since it is effective and scientifically proven. They say that there is no need for spiritual methods such as Reiki, Yoga, Tai Chi. These waste our time, something that is quite precious in our material world. There is medicine that can kill our pain and x-rays that show us our broken bones. We must admit that these methods are very effective in the examples that they provide. However, there are some "everyday complaints" such as back pains, headaches, which are treated currently with medicine. When you have a headache, you take an Aspirin; when you cannot sleep, you take Xanax without thinking of the side effects of these. When you use these pills for a long period, you become dependent on them; you cannot sleep without them. We pay huge amounts of money but never get better. How about a safer and more economical way of healing? When doing Reiki to yourself, you do not need anything except your energy so it is very economical. Also, there are no side effects and it is scientifically explained.

    They also claim that serious illnesses such as HIV/AIDS and cancer cannot be treated without drugs. They think so because these patients spend the rest of their lives in the hospital taking medicine. How can Reiki make these people healthy again? It is very unfortunate that these patients have to live in the hospital losing their hair and weight because of the side effects of the medicine they take. Actually, instead of drugs which are expensive and have many side effects, you can use your energy to overcome the hardships of life, find an emotional balance, leave the stress of everyday life and let go of the everyday worries.

    Some people may still hold that in our material world, everything depends on time. How would it be possible to find time to do Reiki? In fact, Reiki does not require more than 15 minutes of our time. It is less time consuming than medicine if we think of all the time we spend taking medicine for some complaints and taking some more for the side effects as well.

我国化工专家侯德榜的“侯氏制碱法”曾为世界制碱工业做出了突出贡献．他以NaCl、NH₃、CO₂等为原料先制得NaHCO₃，进而生产出纯碱．有关反应的化学方程式为：

NH₃+CO₂+H₂O=NH₄HCO₃；NH₄HCO₃+NaCl=NaHCO₃↓+NH₄Cl；

2NaHCO₃$\stackrel{△}{=}$Na₂CO₃+CO₂↑+H₂O

回答下列问题：

（1）碳酸氢铵与饱和食盐水反应，能析出碳酸氢钠晶体的原因是____ （填字母标号）．

a．碳酸氢钠难溶于水

b．碳酸氢钠受热易分解

c．碳酸氢钠的溶解度相对较小，所以在溶液中首先结晶析出

（2）某探究活动小组根据上述制碱原理，进行碳酸氢钠的制备实验，同学们按各自设计的方案实验．

（Ⅰ）一位同学将二氧化碳气体通入含氨的饱和食盐水中制备碳酸氢钠，实验装置如图所示（图中夹持、固定用的仪器未画出）．

试回答下列有关问题：

①乙装置中的试剂是____ ．②丁装置的作用是____ ．

（Ⅱ）另一位同学用图中戊装置（其它装置未画出）进行实验．

①实验时，须先从a管通入____ 气体（填气体分子式），再从b管通入____ 气体（填气体分子式）．

②有同学建议在戊装置的b管下端连接己装置，理由是____ ．

（3）“纯碱中常常会混有少量氯化钠．”某研究性学习小组以一包纯碱（只考虑含氯化钠）为研究对象，探究纯碱样品中碳酸钠的含量：称取1.840g小苏打样品（含少量NaCl），配制成250mL溶液，取出25.00mL用0.1000mol•L^﹣1盐酸滴定，消耗盐酸21.50mL．

①实验中所需要的定量仪器除滴定管外，还有____ ．②样品中NaHCO₃质量分数为____ ．

（4）将一定质量小苏打样品（只考虑含少量NaCl）溶于足量盐酸，蒸干后称量固体质量，也可测定小苏打的含量．若蒸发过程中有少量液体溅出，则测定结果____ ．（选填“偏高”、“偏低”或“不受影响”）

写作表达。

“温故而知新”是一种学习的方法，“看云识天气”是一种推测天气情况的方法。方法是解决问题的途径、步骤、手段。方法正确，往往事半功倍。

请以“方法”为话题，写一篇文章。

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