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 exam
2011-10-27 09:40 写作
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; wh
2011-10-26 09:20 写作
23 Ford Although Henry Fords name is closely associated with the concept of mass production, he should receive equal credit for introducing labor practices as early as 1913 that would be considered advanced even by todays standards. Safety
2011-10-25 09:27 写作
21 The Origin of Sports When did sport begin? If sport is, in essence, play, the claim might be made that sport is much older than humankind, for , as we all have observed, the beasts play. Dogs and cats wrestle and play ball games. Fishes
2011-10-24 10:28 写作
19.childrens 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
2011-10-21 10:00 写作
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
2011-10-20 09:41 写作
15 The Nobel Academy For the last 82years, Swedens Nobel Academy has decided who will receive the Nobel Prize in Literature, thereby determining who will be elevated from the great and the near great to the immortal. But today the Academy
2011-10-19 09:57 写作
13 Skyscrapers and Environment In the late 1960s, many people in North America turned their attention to environmental problems, and new steel-and-glass skyscrapers were widely criticized. Ecologists pointed out that a cluster of tall buil
2011-10-17 10:19 写作
11 Archaeology Archaeology is a source of history, not just a bumble auxiliary discipline. Archaeological data are historical documents in their own right, not mere illustrations to written texts, Just as much as any other historian, an ar
2011-10-14 10:41 写作
09 Suburbanization If by suburb is meant an urban margin that grows more rapidly than its already developed interior, the process of suburbanization began during the emergence of the industrial city in the second quarter of the nineteenth
2011-10-13 11:11 写作
07 Andrew Carnegie Andrew Carnegie, known as the King of Steel, built the steel industry in the United States, and , in the process, became one of the wealthiest men in America. His success resulted in part from his ability to sell the pro
2011-10-12 11:17 写作
05 The Beginning of Drama There are many theories about the beginning of drama in ancient Greece. The on most widely accepted today is based on the assumption that drama evolved from ritual. The argument for this view goes as follows. In t
2011-10-11 10:06 写作
03 The Definition of Price Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed among buyers. The price system of the United States is a complex netwo
2011-10-10 10:02 写作
01 The Language of Music A painter hangs his or her finished pictures on a wall, and everyone can see it. A composer writes a work, but no one can hear it until it is performed. Professional singers and players have great responsibilities,
2011-10-9 10:50 写作
2、阿克乔克山 1）Akqoka Mountain （新疆昭苏县） 2）Akxoki Mountain (新疆塔城市） 3、色拉寺 1）the Sera Monastery（西藏拉萨市） the Sula Temple（四川色达） 4、单城镇 1）Dancheng Town(黑龙江双城县） 2）Shancheng Town（山东单县） 5、阿扎乡 1)
2011-10-8 10:54 写作
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