正文
《牛津书虫》读到二级一半的时候写了
《牛津书虫》系列图书的正确打开方式（1）
。现在三级也读到一半左右了，继续总结。
词汇
从一级到三级，最明显的差异当然是词汇量。
比如对情绪的描写，一级几乎只有happy, sad, angry, afraid这几个词，所以故事情节稍一紧张人物就angry了，要么就是his/her face became red；到了二级时，人物最经常的情绪是crossly,frightened,terror；三级，人物已经能nervous, gloom等等
语言表达
一级的三十几本书的表达方式都是非常直接的，句式也是最常见的主谓宾，很少修饰词，更少修饰语，比如《绿野仙踪》开头这段：
There were no trees and no hills in Kansas, and it was often very windy. Sometimes the wind came very fast and very suddenly. That was a cyclone, and it could blow trees and people and buildings away. There were cellars under all the houses. And when a cyclone came, people went down into their cellars and stayed there.
这一段，全部是简单句，而且几乎没有什么修饰词。
二级，句式开始复杂，短小的从句频繁出现。比如《鲁宾逊漂流记》开头：
I was born in the year 1632, in the city of York in the north of England. My father was German, but he came to live and work in England. Soon after that, he married my mother, who was English. Her family name was Robinson, so, when I was born, they called me Robinson, after her.
三级，复杂的长句是主流的。比如《野性的呼唤》第一段：
Buck did not read the newspapers. He did not know that trouble was coming for every big dog in California. Man had found gold in the Yukon, and these men wanted big, strong dogs to work in the cold and snow of the north.
篇幅
一级和二级每本书的篇幅差不太多，因为一级的词汇量小句式简单，以我的水平，基本上平均一个小时可以读完一本书，而二级平均需要一个半小时左右。三级的篇幅明显长了，需要两个多小时读完。
