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[新东方背诵文选] 新东方背诵文选 Lesson 50:Cells and&nb
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 mo2006-05-12 编辑：admin
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[新东方背诵文选] 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.2006-05-12 编辑：admin
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[新东方背诵文选] 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 pinh2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 47:Folk Culture
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 develop2006-05-12 编辑：admin
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[新东方背诵文选] 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 s2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 45:The source&n
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 so..2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 44:Obtaining Fr
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 t2006-05-12 编辑：admin
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[新东方背诵文选] 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 (states2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 42:Coal-fired p
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 electr2006-05-12 编辑：admin
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