出国留学网

目录

2018年5月19日托福阅读考试机经

字典 |

2018-05-17 15:53

|

【 liuxue86.com - 托福机经 】

  托福阅读对于托福考生来说,是属于简单类的还是难的呢,大家对于托福考试的阅读题有没有什么信心,下面和出国留学网小编一起来看看2018年5月19日托福阅读考试机经。

  天文类Surface Fluids on Venus and Earth

  参考阅读:

  A fluid is a substance, such as a liquid or gas, in which the component particles (usually molecules) can move past one another. Fluids flow easily and conform to the shape of their containers. The geologic processes related to the movement of fluids on a planet’s surface can completely resurface a planet many times. These processes derive their energy from the Sun and the gravitational forces of the planet itself. As these fluids interact with surface materials, they move particles about or react chemically with them to modify or produce materials. On a solid planet with a hydrosphere and an atmosphere, only a tiny fraction of the planetary mass flows as surface fluids. Yet the movements of these fluids can drastically alter a planet. Consider Venus and Earth, both terrestrial planets with atmosphere.

  Venus and Earth are commonly regarded as twin planets but not identical twins. They are about the same size, are composed of roughly the same mix of materials, and may have been comparably endowed at their beginning with carbon dioxide and water. However, the twins evolved differently, largely because of differences in their distance from the Sun. With a significant amount of internal heat, Venus may continue to be geologically active with volcanoes, rifting, and folding. However, it lacks any sign of a hydrologic system (water circulation and distribution): there are no streams, lakes, oceans, or glaciers. Space probes suggest that Venus may have started with as much water as Earth, but it was unable to keep its water in liquid form. Because Venus receives more heat from the Sun, water released from the interior evaporated and rose to the upper atmosphere where the Sun’s ultraviolet rays broke the molecules apart. Much of the freed hydrogen escaped into space, and Venus lost its water. Without water, Venus became less and less like Earth and kept an atmosphere filled with carbon dioxide. The carbon dioxide acts as a blanket, creating an intense greenhouse effect and driving surface temperatures high enough to melt lead and to prohibit the formation of carbonate minerals. Volcanoes continually vented more carbon dioxide into the atmosphere. On Earth, liquid water removes carbon dioxide from the atmosphere and combines it with calcium, from rock weathering, to form carbonate sedimentary rocks. Without liquid water to remove carbon from the atmosphere, the level of carbon dioxide in the atmosphere of Venus remainshigh.

  Origin of the Solar System

  Comets

  文化艺术类

  The Origins of Writing

  Live Performance

  The Origins of Theater

  The Development of Printing

  地质类

  Early Theories of Continental Drift

  Attempts at Determining Earth’s Age

  How Soil is Formed

  Earth’s Energy Cycle

  Thermal Stratification

  环境类

  The Climate of Japan

  The Role of the Ocean in Controlling Climate

  经济类

  Effects of the Commercial Revolution

  Seventeenth-Century European Economic Growth

  考古类

  Environmental Impact of the Anasazi

  The Collapse of the Mays

  The Chaco Phenomenon

  科学类

  The Birth of Photography

  Early American Printing Industry

  农业类

  Agricultural Society in Eighteenth- Century British America

  Water Management in Early Agriculture

  社会类

  Population Growth in Nineteenth-Century Europe

  Hunting and the Setting of Inner Eurasia

  生物类

  Extinctions at the End of the Cretaceous

  The Cambrian Explosion

  The Extinction of the Dinosaurs

  How Animals in Rain Forests Make Themselves Heard

  Sociality in Animals

  Dinosaurs and Parental Care

  Habitat Selection

  Temperature Regulation in Marine Organisms

  Cell Theory

  Poikilotherms

  Forest Succession

  The Role of Diapause

  The Identification of the Genetic Material

  How Plants and Animals Arrived in the Hawaiian Islands

  Constraints on Natural Selection

  推荐阅读:

  2018年5月19日托福阅读机经

  2018年5月19日托福考试机经汇总

  2018年5月19日托福口语考试机经

  想了解更多托福机经网的资讯,请访问: 托福机经

本文来源:https://toefl.liuxue86.com/t/3732874.html
延伸阅读
很多准备7月份考试的同学早就盼望着这一期的机经了吧!那么接下来就和出国留学网的小编一起来看看2019年7月7日托福写作机经。综合阅读:monarchbutterflymonarch
2019-07-09
对于想练习托福口语的同学来说,机经是比较口语用来进行练习的好材料,那么下面就和出国留学网的小编一起来看看2019年7月7日托福口语机经。Task1Oneofyourfriendde
2019-07-09
准备7月份考试的同学可以看看小编整理的最新机经,那么下面就和出国留学网一起来看看2019年7月7日托福听力机经。Conversation1话题分类:学生和教授内容回忆:学生找到教授
2019-07-09
6月份的托福考试就快来了,那么考试机经有哪些呢?这是不少出国人士比较关心的问题,和出国留学网一起来看看2019年6月托福写作机经!欢迎阅读。独立写作IndependentWriti
2019-05-30
大家可能在备考的时候都会看到很多网站都有自己的托福机经,那么托福机经是什么呢,应该如何使用呢,下面和出国留学网小编一起来看看托福机经高效使用法。什么是托福机经预测?每次托福考试都有
2019-05-17
如果大家想要在托福考试中取得一个好成绩,那么就一定要重视阅读,怎样才能考出好成绩呢?接下来就和出国留学网看看2018年11月24日托福阅读考试机经。VocalizationinFr
2018-11-26
关于2018年11月24日的托福听力考试,想必大家都非常感兴趣,那么今天就跟着出国留学网来看看2018年11月24日托福听力考试机经。题目isthelecturemainlyabo
2018-11-26
在托福考试中,得作文者得天下,因为作文的分数,所占的比重非常大。今天就跟着出国留学网一起来看看2018年11月24日托福作文考试机经。1.Doyouagreeordisagreew
2018-11-26
口语是托福考试中非常重要的一部分,大家对于最新一期的考试,肯定也是非常重视的,那么接下来就和出国留学网看看2019年11月24日托福口语考试机经。1.Whoselecturewou
2018-11-26
对于托福阅读而言,了解一些托福阅读真题的素材是非常重要的,那么下面就和出国留学网的小编一起来看看2019年7月7日托福阅读机经整理。PassageOne学科分类:社会题目:Twof
2019-07-09