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冰山(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 faraway, frigid waters, amid thunderous noise and splashing turbulence, which in most cases no one hears or sees. they exist only a short time and then slowly waste away just as unnoticed.

  objects of sheerest beauty they have been called. appearing in an endless variety of shapes, they may be dazzlingly white, or they may be glassy blue, green or purple, tinted faintly of in darker hues. they are graceful, stately, inspiring ----- in calm, sunlight seas.but they are also called frightening and dangerous, and that they are ---- in the night, in the fog, and in storms. even in clear weather one is wise to stay a safe distance away from them. most of their bulk is hidden below the water, so their underwater parts may extend out far beyond the visible top. also, they may roll over unexpectedly, churning the waters around them.

  icebergs are parts of glaciers that break off, drift into the water, float about awhile, and finally melt. icebergs afloat today are made of snowflakes that have fallen over long ages of time. they embody snows that drifted down hundreds, or many thousands, or in some cases maybe a million years ago. the snows fell in polar regions and on cold mountains, where they melted only a little or not at all, and so collected to great depths over the years and centuries.

  as each year's snow accumulation lay on the surface, evaporation and melting caused the snowflakes slowly to lose their feathery points and become tiny grains of ice. when new snow fell on top of the old, it too turned to icy grains. so blankets of snow and ice grains mounted layer upon layer and were of such great thickness that the weight of the upper layers compressed the lower ones. with time and pressure from above, the many small ice grains joined and changed to larger crystals, and eventually the deeper crystals merged into a solid mass of ice.

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  • 《刘翔的公开信》致谢所有关心和支持我的人: 感谢那么多关心我的人给我的理解和支持,此时此刻我的心也还在为退赛和由此给大家的失望感到难过。 2001年7月13日北京申奥成功的那一天,正好是我18岁的生日。

  • The Baby Eagle
  • once upon a time there was a baby eagle living in a nest perched on a cliff overlooking a beautiful valley with waterfalls and streams, trees and lots of little animals, scurrying about enjoying their lives....

  • 提取牡蛎(Raising Oysters)
  • in the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. first, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean...

  • 炼油(Oil Refining)
  • an important new industry, oil refining, grew after the civil war. crude oil, or petroleum - a dark, thick ooze from the earth - had been known for hundreds of years, but little use had ever been made of it....

  • 保护环境(Protection environment)
  • from this cartoon, we can see that at the top end of the river,is a chemical factory and a paperrnaking factory which send out and poisonous wastes....

  • 世界人口(The World s Population)
  • 世界人口新千年的前50年对世界人口来说是至关重要的,到2050年,世界人口将趋于平稳,但到那时,世界人口将达到100亿,比现在多2/3。但人d增长率是我们现在能选择的事:它不是顺应天意而产生的,而是人类的选择。

  • 生存和毁灭(Live and Die)
  • 生存和毁灭地球上生命的历史一直就是一部生物与其环境相互作用的历史。在很大程度上,地球上动植物的形态以及习性都是由外部环境所塑造的。考虑到地球上生命存在的整个时间,相反作用即生命对其周围环境的实际改变作用一却相对很小。

  • 金钱与快乐新论(What You Dtdn t Know about Money and Happiness)
  • what you dtdn t know about money and happinessver the past 15 years,researchers have studied the connection between money and happiness. their findings shatter many misconceptions....

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