-
- 英语六级考试备考晨读美文——The History of Chemistry
- The History of Chemistry
Chemistry did not emerge as a science until after the scientific revolution in the seventeenth century and then only rather slowly and laboriously. But...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Hydrogen and Industries
- Hydrogen and Industries
Hydrogen, the lightest and simplest of the elements, has several properties that make it valuable for many industries. It releases more heat per unit of...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——MARS
- MARS
Mars According to the best evidence gathered by space probes and astronomers, Mars is an inhospitable planet, more similar to Earth's Moon than to Earth itself - a dr...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Food and Health
- Food and Health The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, m...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Police and Communities
- Police and Communities
Few institutions are more important to an urban community than its police, yet there are few subjects historians know so little about. Most of the early...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Population Growth
- Population Growth
The growth of population during the past few centuries is no proof that population will continue to grow straight upward toward infinity and doom. On the cont...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Evolution and Wheels
- Evolution and Wheels
In the past, evolutionary biologists contemplating the absence of wheels in nature agreed that the explanation was not undesirability: wheels would be good...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——The Language of Music
- The Language of Music
A painter hangs his or her finished picture on a wall, and everyone can see it. A composer writes a work, but no one can hear it until it is performed...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——British Columbia
- British Columbia
British Columbia is the third largest Canadian province, both in area and population. It is nearly 1.5 times as large as Texas, and extends 800 miles (1,280km)...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Botany
- Botany
Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of awareness about which hu...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Plankton
- Plankton
Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Raising Oysters
- Raising Oysters
In the past oysters were raised in much the same way as dirt farmers raised tomatoes - by transplanting them. First, farmers selected the oyster bed, cleared th...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Oil Refining
- Oil Refining
An important new industry, oil refining, grew after the Civil War. Crude oil, or petroleum -- a dark, thick ooze from the earth -- had been known for hundreds of y...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Plate Tectonics and Sea-floor Spreading
- 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 a...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Icebergs
- Icebergs
Icebergs are among nature's most spectacular creations, and yet most people have never seen one. A vague air of mystery envelops them. They come into being -- som...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Topaz
- Topaz
Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable. Jewelers call this variety of the stone "precious topaz"....
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——The Salinity of Ocean
- The Salinity of Ocean
Waters If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are i...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Cohesion-tension Theory
- 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 v...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——American Black Bears
- 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 bears have shiny black fur, but in...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Coal-fired Power Plants
- 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 lar...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Statistics
- Statistics
There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of g...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Obtaining Fresh Water from Icebergs
- Obtaining Fresh Water from Icebergs
The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once treated as a jok...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——The Source of Energy
- The Source of Energy
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Vision
- Vision
Human vision like that of other primates has evolved in an arboreal environment. In the dense complex world of a tropical forest, it is more important to see well than t...
2011-11-25 英语六级阅读资料 -
- 英语六级考试备考晨读美文——Lighthouses
- Lighthouses
The first navigational lights in the New World were probably lanterns hung at harbor entrances. The first lighthouse was put up by the Massachusetts Bay Colony in 1...
2011-11-25 英语六级阅读资料
手机版
英文博客网
