导入:
第1段:Recently we’ve had a discussion about whether we should... (导入话题
Our opinions are divided on this topic.(观点有分歧
正文:
第2段:Most of the students are in favour of it.(正方观点
Here are the reasons. First... Second... Finally...(列出2~3个赞成的理由
第3段:However, the others are strongly against it. (反方观点
Their reasons are as follows. In the first place... What’s more... In addition...(列出2~3个反对的理由
结论:
第4段:Personally speaking, the advantages overweigh the disadvantages, for it will do us more harm than good, so I support it.(个人观点 オ
导入:
第1段:提出一种现象或某种困难作为议论的话题
正文:
第2段:Many ways can help to solve this serious problem, but the following may be most effective. First of all... Another way to solve the problem is ... Finally...(列出2~3个解决此类问题的办法
结论:
第3段:These are not the best but the only two/ three measures we can take. But it should be noted that we should take action to...(强调解决此类问题的根本方法
1、因为土壤中缺乏植物赖以生存的氮。在沙漠地区选试验点,通过精密仪器测量,在此基础上进行研究,发现沙漠地区长时间气温较高,土壤中的氮以气体形式不断挥发,而最终不能回到土壤中。
2、干旱地区种植田地,在保障了充分的水和肥料的前提下,土地的出产不高。
3、沙漠中土壤里的氮为何不可返回。作者采用总分的说明顺序,将干旱地区和气候温和地区进行比较来说明的。
4、采用生动的语言来说明。如“气势汹汹”和“肆无忌惮”两个成语,运用拟人的修辞手法,将沙漠人格化,表现土壤沙漠化的严重,警示人们保护环境。
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