几位同学对炭粉与氧化铁的反应十分感兴趣，自己动手，对过量炭粉与氧化铁反应中气体产物的成分进行了研究。
[提出假设]该反应中的气体产物可能是一氧化碳或二氧化碳和一氧化碳的混合物。
[查阅资料]氮气不与碳、氧化铁发生反应。实验室可以用饱和氯化铵溶液和饱和亚硝酸钠溶液混合加热反应制得氮气。
[设计方案]如图所示，将一定量的氧化铁在隔绝空气的条件下与过量炭粉完全反应，测定参加反应的碳元素与氧元素的质量比。
试回答下列问题：
有同学认为还应对该实验装置作进一步完善，你认为应作如何改进（）
参考答案：在尾气出口处加一个点燃的酒精灯或增加一处尾气处理装置
Have you ever come across this thing？When a rather dirty，poorly dressed person kneels at your feet and reaches out his hands to beg for a few coins，do you hurry to go，not knowing what to do，or do you feel sad and hurriedly __1__ some money？What should our attitude __2__ beggars be？There can be __3__ question that the world is full of terribly sad stories. It __4__ be terrible to have no idea where our next meal is going to come from. It seems __5__ not to give some money to beggars. _6__，most of the world's great religions order us to be openhearted and __7__ what we have with those unluckier than ourselves. But has the world changed？Maybe what was morally right in the old days，__8__ one knew exactly who in the village had suffered misfortune and needed help，is no longer the best idea.Quite a few people will not give some money to beggars.Let us look at their __9__. Firstly，some believe that many city beggars dress themselves up __10_ to look pitiable but actually make a good __11__.Giving something to beggars only encourages this sort of evil(恶行)．__12__，there is the worry that the money you give will be spent on beers，wines or drugs.Thirdly，there is the opinion __13__ there is no real excuse for begging.One might be poor，__14__ that is no reason for losing one's sense of __15__ and selfdependence. Related to this is the opinion that the problem should be handled by the government _16__ ordinary people. Some people think beggars should go to the local government department and _17__ help. It is hard to come to any final conclusion：there are various _18__ and we must __19__ them differently. A few coins can save a life in some situations，and even if the money is wasted，that does not take away the moral goodness of the __20__.
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