When the Audet family turns on the lights at Blue Farm, they are using electricity that comes from cows—cow manure (粪肥), to be specific.

Cows produce a lot of wastes. One cow can create 30 gallons of wastes each day. Now imagine the output of over 1,000 cows at Blue Farm. That’s really a big amount.

When farmers clean their barns, they put the wastes in a big heap, and spread some of them on their fields for fertilizer(肥料). But now places like Blue Spruce Farm have a new way of using cow wastes. They use them to produce electricity.

Here’s how it works: A big machine moves back and forth cleaning the barn floor. “The cows aren’t bothered,” says Marie Audet. “They are animals of habit; they get used to it, and just lift one foot and then another to let it go by.”

The machine pushes the manure into a big 600-gallon tank like a small swimming pool. The tank is called a digester (化粪池) because what happens there is just like what happens inside a cow: Bacteria(细菌) get to work and continue to digest the manure.

Methane gas (甲烷、沼气)in the atmosphere is known as a “greenhouse” gas because it keeps heat just like a greenhouse does, causing our planet to warm up. That’s an environmental concern. But the digester has a good result. Its gas is kept and used to power electric generators (发电机).

At Blue Farm, the generators make enough electricity to power 400 homes. The Audet family sells the extra electricity they can’t use themselves.

1. We learn from the text that the Audet family is using cow wastes to ______.

  A. make electricity           B. produce fertilizer       C. build their farm     D. feed the cows

2. How are the cow wastes collected into the digester at Blue Farm?

  A. Marie Audet does the work                          B. The job is done by machine  

C. The cows lift the cow wastes                         D. Bacteria get to work on them

3. According to the passage, which of the following is changed into electricity?

  A. The power of moving water.                         B. The heat of burning coal.       

C. The power of sunlight.                           D. The heat of the methane gas

4.The new way of using cow wastes at Blue Farm might be best described as ______.

  A. reducing                   B. saving                   C. recycling            D. changing

5. What is the main purpose for writing the passage?

  A. To introduce a new way of making electricity           B. To explain how a new energy works better

  C. To show a new rebuilding plan for a big farm           D. To explain the reasons for green house effect

Each year there are an increasing number of cars on roads，as millions of new cars are produced．One out of every six Americans works at putting together the parts of cars，driving trucks，building roads or filling cars with gas．Americans couldn't live without cars!

Most Americans find it hard to think what life would be without a car．However，some have realized the serious problem caused by cars．The polluted air is harmful and dangerous to health．

One way to get rid of the polluted air is to design a new car．That is what several large car factories are trying to do．But to build the new car is easier said than done．Progress in this field has been slow．

Another way is to replace the car engine with something else．Engineers are working on some new cars．Many makers believe that it will take years to develop a practical model that pleases people．

To prevent the world from being polluted by cars，we'll have to make some changes．Americans，for example，have to cut down the number of their cars．They are encouraged  to travel and go to work by bike．Riding a bike is thought to help keep the air clean．

But this change does not come easily．A large number of workers may find themselves with no jobs if a car factory closes down．And the problem of air would become less important than that of unemployment．

Although ears have brought us a better life，they have also brought us new problems．

1．Some large car factories in the U．S．A are trying to make a new kind of car which _______．

A．is clean in itself                                 B．is used to clean streets

C．is easier to make                                       D．does not pollute the air

2．If the number of cars is cut down，the most serious problem to American workers is to _____．

A．lose their jobs                                          B．pollute their environment

C．go to work on foot                                  D．make their factories richer

3．The writer wants to tell us that _________．

A．riding a bike is the only way out

B．the number of caps must be cut down

C．people wouldn't live without cars

D．cars bring us not only a better life，but also serious problems

4．Which fact does the passage provide?

A．About one sixth of American workers are working in car factories．

B．The hest way to get rid of air pollution is to change the car engine for something else．

C．It isn't easy to change the way of life in the U．S．A．

D．In the U．S．A，bikes will surely take the place of cars in the future．

5．Which is the best title for the passage?

A．A New way to Get Rid of Polluted Air             B．Cars and Polluted Air

C．Many Serious Problems in the U．S．A         D．Changes in Car Production

Each year there are an increasing number of cars on roads, as millions of new cars are produced．One out of every six Americans works at putting together the parts of cars, driving trucks, building roads or filling cars with gas．Americans couldn’t live without cars!

       Most Americans find it hard to think what life would be without a car．However, some have realized the serious problem caused by cars．The polluted air is harmful and dangerous to health．

One way to get rid of the polluted air is to design a new car．That is what several large car factories, are trying to do．But to build the new car is easier said than done．Progress in this field has been slow．

Another way is to replace the car engine with something else．Engineers are working on some new cars．Many makers believe that it will take years to develop a practical model that pleases people．

To prevent the world from being polluted by cars, we’ll have to make some changes．Americans, for example, have to cut down the number of their cars．They are encouraged to travel and go to work by bike．Riding a bike is thought to help keep the air clean．

But this change does not come easily．A large number of workers may find themselves with no jobs if a car factory closes down．And the problem of air would become less important than that of unemployment．

Although cars have brought us a better life, they have also brought us new problems．

1．Some large car factories in the U．S．A are trying to make a new kind of car which        ．

A．is clean in itself                                         B．is used to clean streets

C．is easier to make                                       D．does not pollute the air

2．If the number of cars is cut down, the most serious problem to American workers is to      ．

A．lose their jobs                                           B．pollute their environment

C．go to work on foot                                     D．make their factories richer

3．The writer want to tell us that         ．

A．riding a bike is the only way out

B．the number of cars must be cut down

C．people wouldn’t live without cars

    D．cars bring us not only a better life, but also serious problems

4．Which fact does the passage provide?

    A．About one sixth of American workers are working in car factories．

B．The best way to get rid of air pollution is to change the car engine for something else．

C．It isn’t easy to change the way of life in the U．S．A．

    D．In the U．S．A．bikes will surely take the place of cars in the future．

5．Which is the best title for the passage?

A．A New Way to Get Rid of Polluted Air．

B．Cars and Polluted Air．

C．Many Serious Problems in the U．S．A．

D．Americans Don’t Like Cars．

A．It's Tree Planting Day today.　　B．You'd better be careful next time.

C．How dirty your clothes are!　　 D．It's not very far from our school, you know.　　 E．It doesn't matter.