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新东方背诵文选 Lesson 50:Cells and Temp
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 mo -
新东方背诵文选 Lesson 49:Sleep
Sleep 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. -
新东方背诵文选 Lesson 48:Bacteria
Bacteria 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 pinh -
新东方背诵文选 Lesson 47:Folk Cultures
Folk Cultures 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 develop -
新东方背诵文选 Lesson 46:Vision by
Vision by 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 s -
新东方背诵文选 Lesson 45:The source of&
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 is to be found the s... -
新东方背诵文选 Lesson 44:Obtaining Fresh&nbs
44.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 joke more appropriate t -
新东方背诵文选 Lesson 43: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 government units (states -
新东方背诵文选 Lesson 42:Coal-fired power&nb
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 electr -
新东方背诵文选 Lesson 41:American black
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 -
新东方背诵文选 Lesson 40:Cohesion-tension Th
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 m -
新东方背诵文选 Lesson 39:The Salinity o
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 important. There are th -
新东方背诵文选 Lesson 38: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". The best-... -
新东方背诵文选 Lesson 37: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 ----- somewhere ------in fa... -
新东方背诵文选 Lesson 36:Plate Tectonics&nbs
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 o
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经济学人:英伦生活质量 被挤压成沙漏型的劳务
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