官方真题Official 阅读部分就是一个非常好的语料库，虽然里面的内容大都是科普类的，可能很难直接搬到我们的作文中，但是论证所需的词、短语、句式、乃至结构都是完全可以搬到我们的写作中来的。大家在做阅读的时候如果时间允许，可以多去思考一下，人家的文章结构是什么，每一段的展开的结构又是什么，有哪些结构、句式和表达式可以用到我们写作中。下面我们来看一下官方真题Official1-1 Groundwater这篇阅读文章中一个经典的论证结构，大家可以合理借鉴，助力自己的托福独立写作提升。
论证
论证原文
So much for unconsolidated sediments. Consolidated (or cemented) sediments, too, contain millions of minute water-holding pores. This is because the gaps among the original grains are often not totally plugged with cementing chemicals; also, parts of the original grains may become dissolved by percolating groundwater, either while consolidation is taking place or at any time afterwards. The result is that sandstone, for example, can be as porous as the loose sand from which it was formed.
以上说的都是松散的沉积物，那些坚固的沉积物，也拥有以数万计的毛细孔来容纳水。因为最初颗粒间的缝隙通常并未完全被黏固的化学物质塞满，而且部分颗粒很可能在固化时或固化后被渗入的地下水溶解;结果这些砂岩最终变得和形成它的散沙一样多孔。
论证结构
So much for A. B, too, …. This is because …; also, …, either … or …. The result is that ….
论证例句
So much for students. ..., too, find themselves more pressured than ever before. This is because...; also, the average incomes in most of sectors ..., either because of ... or of .... The result is that ....
学生就说这么多。办公室职员也面临着前所未有的压力。这是因为生活成本，尤其是房价，在大部分一线城市飞速上涨。而且，很多行业的平均收入陷入停滞，或者因为经济衰退或者因为劳动力过剩。结果是越来越多的中国城市居民对前景十分焦虑。
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