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Parents and Kids(父母与子女)2021-09-07
Parents and Kids Man...
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The Case against Advertising(反对广告论)2021-09-07
The Case against Advertising Most people say ...
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The Case for Advertising(赞成广告论)2021-09-07
The Case for Advertising Money spent o...
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Advantages of Ads(广告的益处)2021-09-07
Advantages of Ads Advertisers tend to think...
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Statistics2021-09-07
There were two widely divergent influences on the early development of statistical methods. Statisti...
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Coal-fired power plants2021-09-07
The invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a chea...
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American black bears2021-09-07
American black bears appear in a variety of colors despite their name. In the eastern part of their ...
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Cohesion-tension Theory2021-09-07
Atmospheric pressure can support a column of water up to 10 meters high. But plants can move water m...
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The Salinity of Ocean Waters2021-09-07
If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. ...
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Topaz2021-09-07
Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz ...
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Icebergs2021-09-07
Icebergs are among natures most spectacular creations, and yet most people have never seen one. A va...
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Plate Tectonics and Sea-floor Spreading2021-09-07
The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid oute...
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Oil Refining2021-09-07
An important new industry, oil refining, grew after the Civil war. Crude oil, or petroleum - a dark,...
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Raising Oysters2021-09-07
In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting th...
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Plankton浮游生物2021-09-07
Scattered through the seas of the world are billions of tons of small plants and animals called plan...
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Botany2021-09-07
Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For man...
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British Columbia2021-09-07
British Columbia is the third largest Canadian provinces, both in area and population. It is nearly ...
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The origin of Refrigerators2021-09-07
By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was stil...
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Telecommuting2021-09-07
Telecommuting-- substituting the computer for the trip to the job ----has been hailed as a solution ...
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Scientific Theories2021-09-07
In science, a theory is a reasonable explanation of observed events that are related. A theory often...
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International Business and Cross-cultural Communication2021-09-07
The increase in international business and in foreign investment has created a need for executives w...
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How to Keep Healthy(怎样保持健康)2021-09-07
How to Keep Healthy Nowadays more&nbs...
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About Friendship(关于友谊)2021-09-07
About Friendship Friendship is a kind...
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How to Be True to Yourself(怎样对自己诚实)2021-09-07
How to Be True to Yourself My grandparents believ...