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How can we get rid of garbage （垃圾) ？ Do we have enough energy sources to meet our future

How can we get rid of garbage (垃圾) ？ Do we have enough energy sources to meet our future energy needs？

These are two important questions that many people are asking today. Some people think that man might be able to solve both problems at the same time. They suggest using garbage as an energy source, and at the same time it can save the land to hold garbage.

For a long time, people buried garbage or dumped (倾倒) it on empty land. Now, empty land is scarce. But more and more garbage is produced each year. However, garbage can be a good fuel to use. The things in garbage do not look like coal, petroleum, or natural gas, but they are chemically similar to these fossil(化石) fuels. As we use up our fossil-fuel supplies, we might be able to use garbage as an energy source.

Burning garbage is not a new idea. Some cities in Europe and the United States have been burning garbage for years. The heat that is produced by burning garbage is used to boil water. The steam that is produced is used to make electricity or to heat nearby buildings. In Paris, France, some power plants burn almost 2 million metric tons of the cities garbage each year. The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.

Our fossil fuel supplies are limited. Burning garbage might be one kind of energy source that we can use to help meet our energy needs. This method could also reduce the amount of garbage piling up on the earth.

What two problems can man solve by burning garbage？

A．The shortage of energy and air pollution.

B．The shortage of energy and the land to hold garbage.

C．Air pollution and the shortage of fossil fuel.

D．Air pollution and the shortage of land to hold garbage.

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更多“How can we get rid of garbage …”相关的问题

第1题

根据以下内容回答下列各题, The water we drink and use is running short in the world． We all

have to learn how to stop wasting our limited water. One of the steps we should take is to find ways of reusing it. Experiments have already been done in this field． Today in most large cities, fresh water is used only once, then it runs into waste system. But it is possible to pipe the used water to a purifying factory. There it can be filtered and treated with chemicals so that it can be used again, just as it were fresh from a spring. But even if every large city purified and reused its water, we still would not have enough. Then we could turn to the oceans. All wed have to do to make use of the seawater on earth is to get rid of the salt. This process is called desalinization, and it is already in use in many parts of the world． The way to stop wasting our limited water is to ________.

A.do experiments with water

B.purify the used water and reuse it

C.use fresh water once again

D.make use of seawater

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第2题

The water we drink and use is running short in the world.

We all have to learn how to stop wasting our limited water. One of the steps we should take is to find ways of reusing it. Experiments have already been done in this field.

Today in most large cities, fresh water is used only once, then it runs into waste system. But it is possible to pipe the used water to a purifying factory. There it can be filtered and treated with chemicals so that it can be used again, just as it were fresh from a spring.

But even if every large city purified and reused its water, we still would not have enough. Then we could turn to the oceans. All we’d have to do to make use of the seawater on earth is to get rid of the salt.

This process is called desalinization, and it is already in use in many parts of the world.

The way to stop wasting our limited water is to （）.

A.do experiments with water

B.purify the used water and reuse it

C.use fresh water once again

D.make use of seawater

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第3题

ane：I like oranges,watermelons,grapes,and bananas.Michael：？Jane：How about 8 in

ane：I like oranges,watermelons,grapes,and bananas.

Michael：？

Jane：How about 8 in the morning？We can get there in an hour and a half.

Michael：OK. I'll call John and tell him about our plan.

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第4题

What is the 'biggest city in the world？ That is, （21) city has the largest population？ Thi

What is the 'biggest city in the world？ That is, (21) city has the largest population？ This seems like (22) question to answer, but actually it isn't.

It's actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn't easy to determine a city's boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is.

The second reason that it is difficult to 25 the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York's population in 1979 and an (27) of Mexico City's population in 1981. So we real ly can't compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.

So we can say that these are our two (29) for comparing the populations of cities: one, it's difficult to determine the (30) of a city, and two, it is difficult to get accurate information.

21. A. what

B. which

C. where

D. how

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第5题

When we see well, we do not think about our eyes very often. （79) It is only when we canno

When we see well, we do not think about our eyes very often. (79) It is only when we cannot see perfectly that we realize how important our eyes are.

People who are nearsighted can only see things that are very close to their eyes. Everything else seems blurry (模糊的). Many people who do a lot of close work, such as writing, reading and sewing, become nearsighted. Then they have to wear glasses in order to see distant objects clearly.

People who are farsighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too.

Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts (白内障). Long ago these people olden became blind. Now, however, it is possible to operate on the cataracts and remove them.

Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself, look at object out of one eye; then look at the same object out of your other eye. You will find the object's relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.

We should take good care of our eyes ______.

A．only when we can see well

B．only when we cannot see perfectly

C．even if we can see dell

D．only when we realize how important our eyes are

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第6题

When we see well, we do not think about our eyes very often. It is only when we cannot see

perfectly that we realize how important our eyes are.

People who are near-sighted can only see things that are very close to their eyes.' Everything else is not so clear. Many people who do a lot of close work, such as writing, reading and sewing, become near sighted. Then they have to wear glasses in order to see distant (远处的) things clearly.

People who are far-sighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too.

Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts (白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them."

Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle (角度). To prove this to yourself, look at an object out of one eye; then look at the same object out of the other eye. You will find the object's relation to the background (背景) and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.

We should take good care of our eyes ______.

A．only when we cannot see perfectly

B．only when we can see well

C．even if we can see well

D．only when we realize how important our eyes are

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第7题

My wife and I moved into our home nine years ago. We have a yard and a "rock garden&q

uot;. Therethe rocks appear to be just thrown up onto the dirt as if someone were in a hurry, to finish. Very oftenwhen we have more flowers, Denise or I would plant them between the rocks,just to add some colorto the area.

Last summer I found, in the rock garden, a tiny little plant that I could not immediatelyrecognize. I knew I didn&39; t plant it and Denise said she didn&39; t either. We decided to let it continuegrowing until we could find out what it was.

Weeks passed and as I made my way back to the strange plant, it appeared to&39;be a sunflower. Itlooked thin and tall with only one head on it. I decided to baby it along and weed(除草) around it.As I pulled rocks from the area to get to the weeds, I noticed something unusual. The sunflower hadnot started where I saw it begin. It actually had begun under a big rock and grown under and around it to reach the sun.

If a tiny little sunflower didn&39; t let a big rock stand in its way of developing, we too have theability to do the same thing. If we believe in ourselves like that little sunflower, we can reach wherewe aim to go and get what we need for growth.

We need to believe in ourselves knowing we have the ability to achieve our goals. Like thesunflower, it knew it had the ability to get over the rocks because it had faith in itself that it wouldsucceed. Stand tall like the sunflower and be proud of who and what we are,then other things will beginto support us. We will find a way to go under or around any "rocks" in order to realize our goals.

Why did the family plant flowers in the "rock garden"？

A.To attract visitors.

B.To remove the rocks.

C.To please their neighbors.

D.To make the area colorful.

The author let the tiny plant continue growingA.to see how long it could live

B.to see how big it could grow

C.to find out what it actually was

D.to know if his wife had planted it

Why did the author think the sunflower was unusual？A.It was very thin and tall.

B.It had only one head on it.

C.It grew on top of a big rock.

D.It began to grow under a rock.

What does the author want to say through the story？A.Rocks cannot prevent us from success.

B.Sunflowers are able to grow everywhere.

C.We should take good care of the rock gardens.

D.We can get over difficulties if we trust ourselves.

请帮忙给出每个问题的正确答案和分析，谢谢！

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第8题

提示：星期五晚上有音乐会，Chris得到;两張票，打电话给Linda，问她是否有空一同前往，并约她音乐会后

一起吃饭。Linda听了非常高兴，倆人相约六点四十五分在入口处见面。

Linda：Hello! This is Linda speaking.

Chris：Hello， Linda， this is Chris. _______66________ this Friday evening？

Linda：Yes， why？

Chris：There‘s a good concert， and I’ve got two tickets. I wonder ________67_______.

Linda：That‘s great! _________68_________？

Chris：7 o‘clock. But how about _________69__________ at 6：45？

Linda：OK. I think I can make it.

Chris：After the concert， ________70_________， shall we？

Linda：Wonderful! Why don‘t we go to a Chinese restaurant？

Chris：Why not？ OK， see you Friday.

Linda：See you then. Bye!

__________

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第9题

We need to ________how we're going to get there.

A.work on

B.work out

C.work over

D.work at

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第10题

Young people who drink or use drugs are mainly influenced by both their parents and their

pressure.

Other reasons they take that first drink are to be rebellious (反抗的), for curiosity or "kicks" (刺激) or to escape an unpleasant environment. And young people drink and use drugs because alcohol (酒精) and drugs are at hand.

After first experimental use, young people continue to drink or use drugs because they believe these substances can relieve boredom, increase energy, decrease anxiety, solve problems, or help them socially. They may simply like the "high" they get in the early and middle stages of substance use. After continued use, they will drink or use drugs because they become physically and psychologically (心理地) addicted (上瘾的).

Now that we have admitted that we have to solve this problem. We must decide how to deal with this challenge. Winning this will take a great effort involving local, state, and national government. It will require the effort of schools, but it cannot be done by schools alone. It will take family and com munity involvement. Already a great amount of time, energy and expert knowledge has been directed toward dealing with it but the problem continues.

Which of the following is not mentioned as the reason of drinking and using drugs in the passage？

A．the selling of alcohol and drugs

B．pressure from their parents and relatives

C．curiosity

D．their eagerness to experience what is not permissible to them

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