This is not a cheap way to get more water; _______, it is not a little expensive.

　 A. worse still　 B. on the contrary　　　 C. in short　　　 D. in addition

Today, ultrasonic(超聲的) waves are being put to work in laboratories and factories. If an ultrasound generator is placed in a liquid, the waves move the liquid back and forthhundreds of thousands of times each second. This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids. Paint manufacturers(制造商) use ultrasound to do a better job of blending colors. The companies that make film for your camera find that mixing chemicals by the use of sound waves will produce a more sensitive film.

The new lightweight(輕量的) type of washing machine uses ultrasonic waves to get

clothes clean. Its special ultrasound generator is put into a pail of soapy water containing the soiled clothes. The sound waves drive the soapy water back and forth through the

cloth so fast that everything is soon clean. There is also a new kind of dishwasher that works in much the same way.

Ultrasonic waves can shake a liquid so fast that tiny holes form all through it. The

liquid is actually torn apart by this action. Almost as soon as these holes are made, they fall together again. The result is a powerful pounding action. In the dairy industry this is used for the double purpose of making homogenized(使均勻，使勻質(zhì)) milk and sterilizing(使無菌) it at the same time. If you look at some raw milk with a microscope, you find that it is made up of little drops of butter fat floating around in a watery liquid. In order to make milk easier to digest, these fat droplets(微粒) may be broken up by forcing the milk through very small openings. The result is called homogenized milk. When the ultrasonic method is used, the sound waves not only break up the droplets but also kill the germs in the milk by pounding them to pieces.

1.Why does a paint manufacturer use ultrasound to do a better job of blending colors?

A. Because it is cheap to use ultrasound to blend colors.

B. Because the waves move the liquid so quickly that it can make materials mix quickly or dissolve in liquids.

C. Because they can mix chemicals by the use of sound waves.

D. Because the waves can clean the paint.

2.What properties does ultrasound wave have?

A. Homogenizes and sterilizes the milk.        B. Mix materials and break droplets.

C. Kill germs and sterilize milk.              D. Move liquids quickly.

3.What exists in the raw milk?

A. Little drops of butter fat.               B. Small holes.

C. Fat droplets and germs.                D. Chemicals.

4.Where is ultrasound wave not used?

A. In the paint manufacture.                  B. In the shop mixing bread flour.

C. In the film-making company.           D. In the dairy industry.

Today, ultrasonic(超聲的) waves are being put to work in laboratories and factories. If an ultrasound generator is placed in a liquid, the waves move the liquid back and forth hundreds of thousands of times each second. This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids. Paint manufacturers(制造商) use ultrasound to do a better job of blending colors. The companies that make film for your camera find that mixing chemicals by the use of sound waves will produce a more sensitive film.

The new lightweight(輕量的) type of washing machine uses ultrasonic waves to get clothes clean. Its special ultrasound generator is put into a pail of soapy water containing the soiled clothes. The sound waves drive the soapy water back and forth through the cloth so fast that everything is soon clean. There is also a new kind of dishwasher that works in much the same way.

Ultrasonic waves can shake a liquid so fast that tiny holes form all through it. The liquid is actually torn apart by this action. Almost as soon as these holes are made, they fall together again. The result is a powerful pounding action. In the dairy industry this is used for the double purpose of making homogenized(使均勻，使勻質(zhì)) milk and sterilizing(使無菌) it at the same time. If you look at some raw milk with a microscope, you find that it is made up of little drops of butter fat floating around in a watery liquid. In order to make milk easier to digest, these fat droplets(微粒) may be broken up by forcing the milk through very small openings. The result is called homogenized milk. When the ultrasonic method is used, the sound waves not only break up the droplets but also kill the germs in the milk by pounding them to pieces. (from www.nmet168.com)

1. Why does a paint manufacturer use ultrasound to do a better job of blending colors?

A. Because it is cheap to use ultrasound to blend colors.

B. Because the waves move the liquid so quickly that it can make materials mix quickly or dissolve in liquids.

C. Because they can mix chemicals by the use of sound waves.

D. Because the waves can clean the paint.

2. What properties does ultrasound wave have?

A. Homogenizes and sterilizes the milk.   B. Mix materials and break droplets.

C. Kill germs and sterilize milk.          D. Move liquids quickly.

3. What exists in the raw milk?

A. Little drops of butter fat.       B. Small holes.

C. Fat droplets and germs.        D. Chemicals.

4. Where is ultrasound wave not used?

A. In the paint manufacture.                   B. In the shop mixing bread flour.

C. In the film-making company.       D. In the dairy industry.

Today, ultrasonic(超聲的) waves are being put to work in laboratories and factories. If an ultrasound generator is placed in a liquid, the waves move the liquid back and forth hundreds of thousands of times each second. This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids. Paint manufacturers(制造商) use ultrasound to do a better job of blending colors. The companies that make film for your camera find that mixing chemicals by the use of sound waves will produce a more sensitive film.

The new lightweight(輕量的) type of washing machine uses ultrasonic waves to get clothes clean. Its special ultrasound generator is put into a pail of soapy water containing the soiled clothes. The sound waves drive the soapy water back and forth through the cloth so fast that everything is soon clean. There is also a new kind of dishwasher that works in much the same way.

Ultrasonic waves can shake a liquid so fast that tiny holes form all through it. The liquid is actually torn apart by this action. Almost as soon as these holes are made, they fall together again. The result is a powerful pounding action. In the dairy industry this is used for the double purpose of making homogenized(使均勻，使勻質(zhì)) milk and sterilizing(使無菌) it at the same time. If you look at some raw milk with a microscope, you find that it is made up of little drops of butter fat floating around in a watery liquid. In order to make milk easier to digest, these fat droplets(微粒) may be broken up by forcing the milk through very small openings. The result is called homogenized milk. When the ultrasonic method is used, the sound waves not only break up the droplets but also kill the germs in the milk by pounding them to pieces. (from www.nmet84.com)

8. Why does a paint manufacturer use ultrasound to do a better job of blending colors?

A. Because it is cheap to use ultrasound to blend colors.

B. Because the waves move the liquid so quickly that it can make materials mix quickly or dissolve in liquids.

C. Because they can mix chemicals by the use of sound waves.

D. Because the waves can clean the paint.  

9. What properties does ultrasound wave have?

A. Homogenizes and sterilizes the milk.   B. Mix materials and break droplets.

C. Kill germs and sterilize milk.          D. Move liquids quickly.

10. What exists in the raw milk?

A. Little drops of butter fat.  B. Small holes.  C. Fat droplets and germs.   D. Chemicals.

11. Where is ultrasound wave not used?

A. In the paint manufacture.               B. In the shop mixing bread flour.

C. In the film-making company.   D. In the dairy industry.

Disposing （處理） of waste has been a problem since humans started producing it．As more and more people choose to live close together in cities, the waste-disposal problem becomes increasingly difficult．

    During the eighteenth century, it was usual for several neighboring towns to get together to select a faraway spot as a dump site．Residents or trash haulers （垃圾拖運者） would transport household rubbish, rotted wood, and old possessions to the site．Periodically some of the trash was burned and the rest was buried．The unpleasant sights and smells caused no problem because nobody lived close by．Factories, mills, and other industrial sites also had waste to be disposed of．Those located on rivers often just dumped the unwanted remains into the water．Others built huge burners with chimneys to deal with the problem．

Several facts make these choices unacceptable to modern society．The first problem is space．Dumps, which are now called landfills, are most needed in heavily populated areas．Such areas rarely have empty land suitable for this purpose．Property （房地產(chǎn)） is either too expensive or too close to residential neighborhoods．Long-distance trash hauling has been a common practice, but once farm areas are refusing to accept rubbish from elsewhere, cheap land within trucking distance of major city areas is almost non-existent．

    Awareness （意識） of pollution dangers has resulted in more strict rules of waste disposal．Pollution of rivers, ground water, land and air is a price people can no longer pay to get rid of waste．The amount of waste, however, continues to grow．

    Recycling efforts have become commonplace, and many towns require their people to take part．Even the most efficient recycling programs, however, can hope to deal with only about 50 percent of a city's reusable waste．

1．The most suitable title for this passage would be _________．

    A．Places for Disposing Waste                 B．Waste Pollution Dangers

    C．Ways of Getting Rid of Waste               D．Waste Disposal Problem

2．During the 18th century, people disposed their waste in many ways EXCEPT for ________．

A．burying it                                              B．reducing it       

C．burning it                                            D．throwing it into rivers

3．What can be inferred from the third paragraph?

    A．Farm areas do not accept waste from the city in modern society．

    B．There is cheap land to bury waste in modem society．

    C．It is difficult to find space to bury waste in modem society．

    D．Ways to deal with waste in modem society have varied only a little:

4．The main purpose of writing this article is to _________．

    A．draw people's attention to waste management

    B．warn people of the pollution dangers we are facing

    C．call on people to take part in recycling programs

    D．tell people a better way to get rid of the waste