考研背诵50篇——14 A Rare Fossil Record

The preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering before they can be fossilized. Ichthyosaurs had a higher chance of being

考研背诵50篇——27. Scientific Theories

In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic

考研听力基本功4 Passage2

Television has become the main source of informatio [00:03.84]and entertaiment for the average America [00:07.97]It is estimated that by the time a child reaches 1 [00:12.64]he or she has spent almost twice as much time watching TV as in the classroo

考研听力基本功1 Passage4

Many people have criticized television programmin [00:18.39]They complain that it does not challenge the intellec [00:37.59]shows too much violenc [00:47.44]and appeals to the least educated of viewer [01:04.86]in order to get the largest audienc [01

考研背诵50篇——50. Cells and Temperature

Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C; a departure of a few

考研背诵50篇——41.American black bears

American black bears appear in a variety of colors despite their name. In the eastern part of their range, most of these brown, red, or even yellow coats. To the north, the black bear is actually gray or white in color. Even in the same litter, both

考研背诵50篇——42.Coal-fired power plants

The invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electric power. Coal seemed to fit the bill, and it fueled the earliest power statio

考研背诵50篇——40 Cohesion-tension Theory

Atmospheric pressure can support a column of water up to 10 meters high. But plants can move water much higher; the sequoia tree can pump water to its very top more than 100 meters above the ground. Until the end of the nineteenth century, the moveme

考研背诵50篇——36.Plate Tectonics and Sea-floor Spreading

The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust and part of the underlying mantle. The lithosphere(n.[ 地 ] 岩石圈 )is divided into a few dozen p

考研背诵50篇——25. Movie Music

Accustomed though we are to speaking of the films made before 1927 as silent, the film has never been, in the full sense of the word, silent. From the very beginning, music was regarded as an indispensable accompaniment; when the Lumiere films were s

考研背诵50篇——20 The Historical Significance of American Revolution

The ways of history are so intricate and the motivations of human actions so complex that it is always hazardous to attempt to represent events covering a number of years, a multiplicity of persons, and distant localities as the expression of one int

考研背诵50篇——19.children’s numerical skills

people appear to born to compute. The numerical skills of children develop so early and so inexorably that it is easy to imagine an internal clock of mathematical maturity guiding their growth. Not long after learning to walk and talk, they can set t

考研背诵50篇——18.Modern American Universities

Before the 1850's, the United States had a number of small colleges, most of them dating from colonial days. They were small, church connected institutions whose primary concern was to shape the moral character of their students. Throughout Europe, i

考研背诵50篇——17.Evolution of sleep

Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. There is some evidence that the two types of sleep, dreaming and drea

英语写作常用高频短语100句（下）

英语写作常用高频短语100句（下）

高频英语口语对话 第464期:喝威士忌(2)

unit 521 喝威士忌（2） dialogue 英语情景对话 A:Good evening, sir. What can I do for you? A:晚上好，先生。请问您要点什么？ B:Bourbon, please. B:请给我波旁威士忌。 A:How would you like your Bourbon, straight or on th

高频英语口语对话 第399期:车辆故障

unit 430 车辆故障 dialogue 英语情景对话 A:There seems something wrong with the engine. Could you check it, please? A:引擎好像有些问题。能不能麻烦你检查一下？ B:Sure. What's the problem? B:好的。什么问题？

高频英语口语对话 第254期:入住双人房(2)

入住双人房（2） dialogue 英语情景对话 A:Good morning, sir. How may I help you? A:早上好，先生。有什么可以为您效劳的吗？ B:Good morning! Do you have any rooms available at the moment? B:早上好，请问现在有空房吗

高频英语口语对话 第244期:喝杯杜松子酒

unit 267 喝杯杜松子酒 dialogue 英语情景对话 A:Hi! I'm happy you could make it. A:嗨！很高兴您能来这儿。 B:Well, I've been looking forward to seeing you. B:我一直在盼望看到您。 gim.jpg A:What can I get you? A:想来点什

托福听力高频短语20个

考生要熟记托福听力必备的高频短语。小编为大家带来托福听力高频短语20个，希望对大家托福备考有所帮助。 下面为大家介绍一下这20个托福听力必备的高频短语的相关内容，希望能够给准备