Earth's Surface(高二适用)

If a man in a spaceship looked down at the earth from many mileshigh above the island of Tahiti(南太平洋中的塔希提岛),he would seemainly water.He might think that the earth was a very very large oceanwith little land. If,however,he looked down at the earth from a position above Eu-     

Disasters of nature

Volcanoes There are thou-sands of volcanoes all over the world. What makes volcanoes? What happens? The inside of the earth is very hot. Be-cause it is very,very hot,the rock has melted like ice.It has become liquid,like water.It is always boiling, like water in a kettle. If you have seen a kettle boiling, you know that the steam and boiling water try to get out. The very hot melted rock inside the earth also tries to get out. Usually it cannot be-cause the outside of the earth is too thick…     

Life

The earth itself is thought to be more than twice as old as life on it.Two billion years ago,the earth was like a great ball about as hot on its surface as boiling water.As the earth蒺s surface becam e less hot,the thick clouds round it,from which waterwenton raining down,gotthinner.The m ore sunlightcould getthrough to the surface ofthe earth.Sunlightis necessary for lifeon earth,as airand waterare.Life began,m en think,in the saltsea.Nearthe land,where the waters werenotdeep,very sm allone…     

Trees Are Very Important

Last year I became a member of Greener China. I was very happy. Our teacher said,"Trees are very important because they can help to keep rain water from pouring into rivers too fast and from hitting the farmland directly. Trees can stop the wind from blowing the earth away and the sand from moving towards the rich farmland. In a word, the more trees there are, the better harvest we have every year. Trees can improve our environment."Next Sunday I will go with my group to plant trees. We sh…     

完形填空(英文)

The earth moves round the sun,and the moonmoves round the earth.When our past of the earth　 1　 away from the sun,it is night.When our pastof the earth runs to the sun,it is day.The sun is much　 2　 than the moon. Butsometimes the moon 　 3　 bigger than the sun,because it is much　 4　 to the　 5　 .The sun is very bright.It　 6　 very stronglight.The moon looks quite bright.　 7　 .But it　8　 give any light at all.The light from the mooncomes　 9　 the sun.The moon looks　 10　 bigger …     

英语短文填空应试策略

例题解析1The earth moves round the s1. When our part ofthe earth turns to thesun,it is d2.When our part oftheearth turnsa3fromthe sun,it isnight.The sun is much bigger than the moon.But sometimesthe moon looks big-ger than the sun,because it is muchn4totheearth.The sun is very bright.It gives very strong15.The moon looksquite bright,but it d6give anylight atall.Thelightfromthemooncomesf7thesun.The moonlooksmuchbiggerandbrighter t8thestars.Butinfactthe stars are a lot bigger and brighter tha…     

Space Case

The vacuum of space is a hostile, forbidding place: people must re- main in high-tech cocoons if they are to travel or work above the lowest few thousand feet of the earth’s atmosphere. And living beings aren’t the only things at risk . The very molecul…     

A Big Crab

I am a star in July.People call me Cancer(巨蟹座).I’m a big crab(蟹).Long,long ago I lived in water on the earth.My favorit sport is swimming.So,I like summer.I like rains and sunshine in the season.I have two arms.They are very long and strong and sharp like big     

Earth return path impedances of underground cable for three-layer earth

One of the factors that affect the parameters of an underground cable is earth return path impedance. Pollaczek developed a formula for the case of one-layer （homogenous） earth. But in practice the earth is composed of several layers. In this study we develop a new formula for earth return path impedance in the case of a three-layer earth. To check the accuracy of the obtained results, a comparison has been made with the finite element method （FEM）. A comparison between the results of the Pollaczek formula and results of the obtained formula for a three-layer earth has been made, showing that the use of the Pollaczek formula instead of the actual formula can cause serious errors.     

阅读理解练与析(英文)

AThe volcano is one of the most surprising fright-ening things of nature. Maybe you have seen pictures of these “fireworks” of nature. Sometimes when a volcano erupts, a very large wall of melted rock moves down the side of a mountain. It looks like a“river of fire”. Sometimes volcanoes explode, throw-ing the melted rock and ashes high into the air. But where does this melted rock come from?The earth is made up of many layers (层). The toplayer that we see is called the crust. Under the …     

为什么我们不会从地球上掉落?

The earth is big. It is a big round ball.There are rocks on the earth. There are fields onthe earth. There are seas and rivers on the earth.     

The Wind

The sun can make the wind blow! The sun can make air move across the earth in a wind.First, sunshine makes the earth warm. Then when the air is close to the earth, the earth makes it warm. As the air gets warmer, it also gets lighter. It goes up while cooler air moves in to fill its place. This is like a turning wheel(车轮)--as one part is going up, another part is moving along the ground.The warm air grows cool when it is high above the earth, and then it comes down again. Once more the ear…     

Our Life in the Future

Our life will be different in the future. In hundreds of years,the earth will be crowded and the cities will be bigger.There will be lots of high buildings.There will be fewer trees and more pollution.People will go to work by subway or plane,because they will be faster.There will be a robot in each family.The robot will help us to do the housework.We will have more free time to relax.People will fly to the moon for vacation.Some people will live in space.In the future,our life will be very easy and interesting.We will be very happy.I can’t wait!     

Optimizing Earth Allocation for Rock-Fill Dam Construction

An optimal allocation of earth is of great significance to reduce the project cost and duration in the construction of rock-fill dams. The earth allocation is a dynamic system affected by various time-space constraints. Based on previous studies, a new method of optimizing this dynamic system as a static one is presented. In order to build a generalized and flexible model of the problem, some man-made constraints were investigated in building the mathematic model. Linear programming and simplex method are introduced to solve the optimization problem of earth allocation. A case study in a large-scale rock-fill dam construction project is presented to demonstrate the proposed method and its successful application shows the feasibility and effectiveness of the method.     

How Can We Save the Earth

The earth is the most beautiful planet in the space.But nowadays,the earth is destroyed by some activities of mankind-There’s a lot of pollution all over the world,such as air pollution,water pollution and so on.It is important for us to save the earth.But how can we save the earth?Here are my suggestions.First,weshouldprotecttheplants.Weshouldn’tcuttrees,walkongrassandpickflowers.Second,weshouldpayattentiontorecycle.Andthenweshouldsaveenergyandwater.Weshouldturnoffthelightwhenitisnottood…     

太空中的女性

Today,many astronauts(宇航员)have the experience(经验)towork in the space station(太空站)above the earth.But till now,only a fewwomen did it.Among them,Shannon W.Lucid is the brightest one.In1943Shannon was born in Shanghai.When she was a little child,she became inter-ested in flying.She liked flying,camping,hik-ing and reading.She studied chemistry(化学)in the university(大学)and got her doctor’sdegree(博士学位)in1973.Shannon did very well in her work.In1979,she became an astronaut.From …     

Mother Earth: Origin of Homeliness and of Strength to Resist

It intends to explore the roles earth plays in Michael K’s passive resistance against the patriarchal authority.Inspired by Homi Bhabha’s concept of“unhomeliness”,it illustrates how earth gives K the sense of homeliness.As the female is closely connected to earth,it also explains how earth helps K get free from the patriarchal wars.By portraying a deformed colored K,Coetzee expresses that the disadvantaged and inferior could resort to mother earth to get freedom and dignity.The female features of protection and nurture are crucial to help the discriminated groups to resist the patriarchal authority.     

初中英语选择题百例(下)

51.The teacher said to Li Lei,“Be careful,you missed “f’’in word“diferent”.” A.an…the B.a…a C.an…a D.a…the 52.There is——apple on the table.——appleis Tomk. A.an…the B.a…an C.an…The D.the…The 53.There is “u”, “s’’and “e”in theword“use”. A.an,an,an B.a,an,a C.a,an,an【).an,a,an 54.From——space the earth looks very smaU. A.a B.an C.the D./ 5豇——interesting stOry it is! A.What a B.What an C.How D.How an 56.The train will arrive haH hour. A.after…an B.af…     

初中英语阅读专项训练(英文)

Languages There are more than 3,000 million people on the earth and about 2,500 languages. Of these languages only about twelve are used by more than 50 million people. Here are the names of some languages which have very wide use: