时间:2019-01-05 12:09:55 英语知识 我要投稿



必威集团下载  How the Hawaiian Is lands Were Built


  Volcanoes have been erupting on the earth for millions of years.More than five hundred still erupt today.These are called active volcanoes.Volcanoes are located in belts or chains.They are found where the earth's crust is weak.The weak spots let the hot rock escape when the volcano erupts.

  Many volcano belts are mountain ranges along the edges of continents.One belt runs along the western coast of South America up through the western part of the United States.Other volcanoes are found in ocean basins.

  About three-fifths of all active volcanoes in the world are in the Pacific Ocean.Many of these volcanoes erupt under the water.The Hawaiian Islands were built by volcanoes that began erupting under water and finally reached the surface of the ocean.

必威集团下载  夏威夷群岛是怎样形成的



必威集团下载  世界上大约有3/5的活火山在太平洋,这些火山中有许多在水下喷发。夏威夷群岛便是由从水下喷发、最终达到洋面的火山而形成的。


  Diamonds in the United States

  Most of the world's diamonds come from Africa,but there is one place in the United States where they are found.It is near Murfreesboro,Arkansas.

  Diamonds were first found near Murfreesboro in 1906.About fifty thousand diamonds have come from this field.One forty-caratdiamond was the largest ever found in North America.But most of the stones were too small to make mining worthwhile.Soon all mining stopped there.Today a visitor to Murfreesboro can hurt for diamonds himself.

  A few diamonds have been found in sand and gravel along the Great Lakes,too.But none of these were in their original blue ground.They may have been formed far to the north and carried south by the last great glaciers.



必威集团下载  1906年,在默弗里斯博罗附近首次发现钻石,从这个矿里一共开采了大约5万颗钻石,其中一颗重40克拉的钻石是迄今在北美洲发现的最大的一颗。但是,多数钻石都太小,没有什么开采价值,不久那里的采掘工作就都停止了。今天去默弗里斯博罗的游客可以亲自去寻找钻石。



  The Three Ways of Man to Preserve Meat

必威集团下载  Finding enough meat was a problem for primitive man.Keeping it for times when it was scarce was just as hard.Three ways were found to keep meat from spoiling:salting,drying,and freezing.

  People near salty waters salted their meat.At first they probably rubbed dry salt on it,but this preserved only the outside.Later they may have pickled their meat by soaking it in salt water.

必威集团下载  In hot,dry lands,men found that they could eat meat that had dried while it was still on the bones.They later learned to cut meat into thin strips and hang it up to dry in the hot air.

必威集团下载  Men in cold climates found that frozen meat did not spoil.They could leave their meat outside and eat it when they pleased.

必威集团下载  人类储存肉的三种方法

必威集团下载  对原始人类来说,获得充足的肉是件难事,而把肉类储存到缺肉的时令也同样不容易。人们找到了防止肉类变腐的三种办法:盐腌、风干和冷冻。





  Earthworms that Help Improve the Soil

必威集团下载  The earthworm is a useful animal.Out of the ground,it is food for other animals.In the ground,it makes rich soil for fields and gardens.

  Earthworms dig tunnels that loosen the soil and make it easy for air and water to reach the roots of plants.These tunnels help keep the soil well drained.

  Earthworms drag dead leaves,grass,and flowers into their burrows.When this plant material decays,it makes the soil more fertile.

必威集团下载  No other animal is so useful in building up good topsoil.It is estimated that in one year fifty thousand earthworms carry about eighteen tons of fine soil to the surface of an acre of land.One worm may add three quarters of a pound of earth to tho topsoil.

必威集团下载  帮助改良土壤的蚯蚓

必威集团下载  蚯蚓是一种有益的动物。来到地面上,它成了其他动物的食品,而在地里,它却为田地和花园制造着肥沃的土壤。

必威集团下载  蚯蚓挖掘风洞,使土壤变松,并使空气和水容易抵达植物的根部。这些风洞有助于土壤迅速排水。

必威集团下载  蚯蚓把枯树叶、草和花朵拖进自己的洞中,这种植物性物质腐烂后,便使土壤变得更肥沃了。



  Who First Made Ice Cream

必威集团下载  Most Americans think that ice cream is as American as baseball and apple pie.But ice cream was known long before America was discovered.

必威集团下载  The Roman emperor Nero may have made a kind of ice cream.He hired hundreds of men to bring snow and ice from the mountains.He used it to make cold drinks.Traveler Marco Polobrought back recipes for chilled and frozen milk from China.

必威集团下载  Hundreds of years later,ice cream reached England.It is said that King Charles Ienjoyed that treatvery much.There is a story that he bribed his cook to keep the recipe for ice cream a royal secret.

必威集团下载  Today ice cream is known throughout the world.Americans alone eat more than two billion quartsa year.



必威集团下载  古罗马国王尼禄可能配制过一种冰淇淋。他曾雇用几百人从山上搬来雪和冰,用以制作冷饮料。旅行家马可波罗也曾从必威必威集团下载下载带回了冷冻奶和冰奶的.配方。




必威集团下载  The Necktie through Thick and Thin

  From hat to shoes,men's clothes are useful.Only one piece of clothing is worn just for decoration.It is the necktie,or cravat.The necktie is left over from the time when men wore ruffles,ribbons,and tassels.

必威集团下载  Beau Brummel was an Englishman of the early 1800's.He was famous for his fancy clothes.The story is told that he used to invite guests just to watch him knot his white cravat.

必威集团下载  Now,perhaps,even the necktie is going out of style.It has been getting smaller and smaller for hundreds of years.It started out as a piece of lace and turned into a silk bow.Then it became a triangle that was tied around the neck.Now many neckties are no wider than a piece of string.



必威集团下载  博·布伦美是19世纪初叶的一位英国人,因穿着的花哨而出名。传说他常邀请客人专程去观看他给自己白色的领带打结。

必威集团下载  现在,也许连领带也快不时髦了。几百年来,领带变得越来越小。当初,它只不过是一段带子,后来变成丝制的蝴蝶结,以后又演变为缠在脖子上的三角形饰物。现在许多领带的宽度只不过相当于一根绳子的粗细罢了。










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