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1、2010年12月英语四六级考试必背优秀范文(14)4300字 毕业提醒广大考生每天背诵一篇优秀作文，能有效的帮助考生提高写作能力。 27. Scientific Theories 论文代写 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
2、 good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion. 思想汇报 /sixianghuibao/A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observ
3、ed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the th
4、eory may have to be revised or rejected. 作文 /zuowen/ Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said, “Science is built with facts just as a house is b
5、uilt with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house.” 思想汇报 /sixianghuibao/Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, t
6、he scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses. 开题报告 /html/lunwenzhidao/kaitibaogao/In a way, any hypothesis is a leap into the unknown. It extends the scient
7、ists thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. Without hypothesis, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories. 论文代写28.Changing Roles of
8、 Public Education 毕业论文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 1950s and 1960s on the schools. In the 1920s, but especially in the Depression conditions of the 1930s, the U
9、nited States experienced a declining birth rate - every thousand women aged fifteen to forty-four gave birth to about 118 live children in 1920, 89.2 in 1930, 75.8 in 1936, and 80 in 1940. With the growing prosperity brought on by the Second World War and the economic boom that followed it young peo
10、ple married and established households earlier and began to raise larger families than had their predecessors during the Depression. Birth rates rose to 102 per thousand in 1946,106.2 in 1950, and 118 in 1955. Although economics was probably the most important determinant, it is not the only explana
11、tion for the baby boom. The increased value placed on the idea of the family also helps to explain this rise in birth rates. The baby boomers began streaming into the first grade by the mid 1940s and became a flood by 1950. The public school system suddenly found itself overtaxed. While the number o
12、f schoolchildren rose because of wartime and postwar conditions, these same conditions made the schools even less prepared to cope with the food. The wartime economy meant that few new schools were built between 1940 and 1945. Moreover, during the war and in the boom times that followed, large numbe
13、rs of teachers left their profession for better-paying jobs elsewhere in the economy.Therefore in the 1950s and 1960s, the baby boom hit an antiquated and inadequate school system. Consequently, the “ custodial rhetoric” of the 1930s and early 1940s no longer made sense that is, keeping youths aged
14、sixteen and older out of the labor market by keeping them in school could no longer be a high priority for an institution unable to find space and staff to teach younger children aged five to sixteen. With the baby boom, the focus of educators and of laymen interested in education inevitably turned toward the lower grades and back to basic academic skills and discipline. The system no longer had much interest in offering nontraditional, new, and extra services to older youths. 论文代写
2010年12月英语四六级考试必背优秀范文(14)4300字
