- 新东方背诵文选 Lesson26 International Business and Cross-cultura2008-01-02 13:20:26
- The increase in international business and in foreign investment has created a need for executives with knowledge of foreign languages and skills in cross-
cultural communication. Americans, however, - 新东方背诵文选 Lesson27 Scientific Theories2008-01-02 13:20:27
- 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 produc
- 新东方背诵文选 Lesson28 Changing Roles of Public Education2008-01-02 13:20:28
- One of the most important social developments that helped to make possible a shift in thinking about the role of public education was the effect of the baby boom of the 1950's and 1960's on the scho
- 新东方背诵文选 Lesson29 Telecommuting2008-01-02 13:20:29
- Telecommuting-- substituting the computer for the trip to the job ---- has been hailed as a solution to all kinds of problems related to office work.
For workers it promises freedom from the office, - 新东方背诵文选 Lesson30 The origin of Refrigerators2008-01-02 13:20:30
- By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice tra
- 新东方背诵文选 Lesson31 British Columbia2008-01-02 13:20:31
- British Columbia is the third largest Canadian provinces, both in area and population. It is nearly 1.5 times as large as Texas, and extends 800 miles(1,280km) north from the United States border. It
- 新东方背诵文选 Lesson32 Botany2008-01-02 13:20:32
- 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 humans had anything more than the
- 新东方背诵文选 Lesson33 Plankton浮游生物.2008-01-02 13:20:33
- 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 eye to see. They drift about lazi
- 新东方背诵文选 Lesson34 Raising Oysters2008-01-02 13:20:34
- In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then
- 新东方背诵文选 Lesson35 Oil Refining2008-01-02 13:20:35
- 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 years, but little use had ever been made
- 新东方背诵文选 Lesson36 Plate Tectonics and Sea-floor Spreading2008-01-02 13:20:36
- 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(
- 新东方背诵文选 Lesson37 Icebergs2008-01-02 13:20:37
- 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 ----- somewhere ------in faraway, frigid wa
- 新东方背诵文选 Lesson38 Topaz2008-01-02 13:20:38
- 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". The best-known prec
- 新东方背诵文选 Lesson39 The Salinity of Ocean Waters2008-01-02 13:20:39
- 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 important. There are three basic processes that cause
- 新东方背诵文选 Lesson40 Cohesion-tension Theory2008-01-02 13:20:40
- 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. U
- 新东方背诵文选 Lesson41 American black bears2008-01-02 13:20:41
- 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
- 新东方背诵文选 Lesson42 Coal-fired power plants2008-01-02 13:20:42
- 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
- 新东方背诵文选 Lesson43 Statistics2008-01-02 13:20:43
- 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 government units (states and statist
- 新东方背诵文选 Lesson44 Obtaining Fresh water from icebergs2008-01-02 13:20:44
- 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 joke more appropriate to cartoons than real life. But now it is
- 新东方背诵文选 Lesson45 The source of Energy2008-01-02 13:20:45
- 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 is to be found the source of the energy that the
- 新东方背诵文选 Lesson46 Vision by2008-01-02 13:20:46
- 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 that to develop an acute sense of sme
- 新东方背诵文选 Lesson47 Folk Cultures2008-01-02 13:20:47
- A folk culture is a small isolated, cohesive, conservative, nearly self-sufficient group that is homogeneous in custom and race with a strong family or clan structure and highly developed rituals. Ord
- 新东方背诵文选 Lesson48 Bacteria2008-01-02 13:20:48
- Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter: a pinhead is abo
- 新东方背诵文选 Lesson49 Sleep2008-01-02 13:20:49
- Sleet is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you fi
- 新东方背诵文选 Lesson50 Cells and Temperature2008-01-02 13:20:50
- 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 withi
