月日托福考试阅读解析.docVIP

2015年3月28日托福考试阅读解析 　　这次考试整体难度中等，第一篇和第二篇相对难度较低，第三篇中的专有名词容易造成考生的阅读障碍,词汇题基本上都是属于比较基础的词汇，在平时的TPO阅读中也有碰到过。三篇文章题材较常见，分别是地质类，历史类和社科类。TPO中也有相似练习篇章。 　　词汇题： 　　第一篇： 　　题材划分：地质类文章 　　主要内容： 　　bar, 冲击扇，delta的形成, upstream和downstream的sediment的比较。 　　upstream的部分沉淀物多是鹅卵石之类的大块东西，downstream大部分沉淀物是粘土。按理说downstream冲击力大，应该是大块的东西才对，原因是downstream的沉积物多半是对upstream的冲蚀作用。 　　河流的水速度不一样，就像气流，冲积扇往往形成新的河道，还有地上河，有些河道一部分在水面之上，一部分在水面之下。 　　Point bar的话是河流内外侧流速不一样，干旱半干旱山区和冰川地区容易形成冲积扇，在湖泊和海边流速慢的地方会形成delta 　　大部分的冲积扇面积很广，但是有个地方千年来的冲积扇面积不是很大，这个地方有7个河道，最近有关部门费了很大力气整改，想让它稳定. 　　解析：整体文章结构清晰，对比清楚，考生只要抓住各段主旨即可。学生如果有这方面的背景知识也可帮助做题。 　　相似TPO练习推荐： 　　TPO7- The Geologic History of the Mediterranean 　　TPO27- The Formation of Volcanic Islands 　　相关文章： 　　Earth’s surface is not made up of a single sheet of rock that forms a crust but rather a number of “tectonic plates” that fit closely, like the pieces of a giant jigsaw puzzle. Some plates carry islands or continents others form the seafloor. All are slowly moving because the plates float on a denser semi-liquid mantle, the layer between the crust and Earth’s core. The plates have edges that are spreading ridges (where two plates are moving apart and new seafloor is being created), subduction zones (where two plates collide and one plunges beneath the other), or transform faults (where two plates neither converge nor diverge but merely move past one another). It is at the boundaries between plates that most of Earth’s volcanism and earthquake activity occur. 　　Generally speaking, the interiors of plates are geologically uneventful. However, there are exceptions. A glance at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes----many no longer active, some overgrown with coral----that originated from activity at points in the interior of the Pacific Plate that forms the Pacific seafloor. 　　How can volcanic activity occur so far from a plate boundary? The Hawaiian Islands provide a very instructive answer. Like many other isl