托福阅读理解试题节选
托福阅读原文
Groundwater is the word Groundwater is the word used to describe water that saturates the ground, filling all the Groundwater is the word used to describe water that saturates the ground, filling all the available spaces. By far the most abundant type of groundwater is meteoric water; this is the groundwater that circulates as part of the water cycle. Ordinary meteoric water is water that has soaked into the ground from the surface, from precipitation (rain and snow) and from lakes and streams. There it remains, sometimes for long periods, before emerging at the surface first thought it seems incredible that there can be enough space in the “solid” ground underfoot to hold all this water.
The necessary space is there, however, in many forms. The commonest spaces are those among the particles—sand grains and tiny pebbles—of loose, unconsolidated sand and gravel. Beds of this material, out of sight beneath the soil, are common. They are found wherever fast rivers carrying loads of coarse sediment once flowed. For example, as the great ice sheets that covered North America during the last ice age steadily melted away, huge volumes of water flowed from them. The water was always laden with pebbles, gravel, and sand, known as glacial outwash, that was deposited as the flow slowed down.
The same thing happens to this day, though on a smaller scale, wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows: the water usually spreads out fanwise, depositing the sediment in the form of a smooth, fan-shaped slope. Sediments are also dropped where a river slows on entering a lake or the sea, the deposited sediments are on a lake floor or the seafloor at first, but will be located inland at some future date, when the sea level falls or the land rises; such beds are sometimes thousands of meters thick.
In lowland country almost any spot on the ground may overlie what was once the bed of a river that has since become buried by soil; if they are now below the water’s upper surface (the water table), the gravels and sands of the former riverbed, and its sandbars, will be saturated with groundwater.
So much for unconsolidated sediments. Consolidated
-
托福考试阅读范文:无限假期unlimitedvacation
在托福备考阶段,阅读大量的文章有利于提高大家的阅读能力,于此同时耗能积累词汇和语法,何乐而不为呢?为了帮助大家提高托福阅读能力,下面准备了一篇托福阅读考试范文,一起来看看吧!无限假期unlimitedvacationLikeall-you-can-eatshrimportherighttoconsumecandyandi...
-
2016托福听力高分备考技巧
新托福由四部分组成,分别是阅读(Reading)、听力(Listening)、口试(Speaking)、写作(Writing)。每部分满分30分,整个试题满分120分。下面是yjbys网小编提供给大家关于托福听力高分备考技巧,希望对大家的备考有所帮助。首先,最重要的一点是每一个同学都应该找到最适...
-
2017年托福阅读真题回顾解析
学习既要有铁棒磨成针的精神,又要有举一反三的;读书既要有勇于攀登的志气,又要有乐于思考的'精神。以下是小编为大家搜索整理的2017年托福阅读真题回顾解析,希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!考题1Thephrase"thisrespect"inthep...
-
2017托福独立写作中间段常见问题最佳解决方法
导语:托福写作要注重开头和结尾的同时也要注重中间段,下面由YJBYS小编告诉大家2017托福独立写作中间段常见问题最佳解决方法,欢迎参考!独立写作中间段常见问题最佳解决方法1.Q:一定需要三大段论点理由展开来证明开头观点吗?A:No.中间段可以有一个论点展开,也可以拿...