Today, ultrasonic(超声的) 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(轻量的) 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(使均匀，使匀质) milk and sterilizing(使无菌) 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.

A. Set a Good Example for Your Kids

B. Build Your Kids’ Work Skills

C. Place Time Limits on Leisure Activities

D. Talk about the Future on a Regular Basis

E. Help Kids Develop Strategies of dealing with different things

F. Help Your Kids Figure Out Who They Are

G. Build Your Kids’ Sense of Responsibility

How Can a Parent Help?

Mothers and fathers can do a lot to ensure a safe landing in early adulthood for their kids. Even if a job’s starting salary seems too small to satisfy an emerging adult’s need for rapid content, the transition from school to work can be less of a setback if the start-up adult is ready for the move. Here are a few measures, drawn from my book Ready or Not, Here Life Comes, which parents can take to prevent what I call “work-life unreadiness.”

1._________You can start this process when they are 11 or 12. Regularly review their emerging strengths and weaknesses with them and work together on any shortcomings, like difficulty in communicating well or cooperating. Also, identify the kinds of interests they keep coming back to, as these offer clues to the careers that will fit them best.

2.________Kids need a range of real role models. Have regular dinner-table discussions about people the family knows and how they got where they are. Discuss the advantages and disadvantages of your own career and encourage your kids to form some ideas about their own future. When asked what they want to do, they should be discouraged from saying “I have no idea.” They can change their minds 200 times, but having only a foggy view of the future is of little good.

3._______Teachers are responsible for teaching kids how to learn; parents should be responsible for teaching them how to work. Assign responsibilities around the house and make sure homework deadlines are met. Encourage teenagers to take a part-time job. Kids need plenty of practice developing effective organizational skills, such as managing time and setting priorities(优先).

4._________Playing video games encourages immediate content（满足）. And hours of watching TV shows with canned laughter only teaches kids to process information in a passive way. At the same time, listening through earphones to the songs for a long time encourages kids to stay inside instead of participating in other outdoor activities. All these activities can prevent the growth of children’s communication and thinking skills and make it difficult for kids to develop the kind of sustained (持续的) concentration they will need for most jobs.

5._________They should know how to deal with setbacks, stresses and feelings of inadequacy. They should also learn how to solve problems and resolve conflicts, ways to brainstorm and think critically. Discussions at home can help kids practice doing these things and help them apply these skills to everyday life situations.

What about the son or daughter who is grown but seems to be struggling and wandering aimlessly through early adulthood? Parents still have a major role to play, but now it is more delicate. Most of all, these new adults must feel that they are respected and supported by a family that appreciates them.

Britons Learn to Forgive
LEEDS, England ─ A Leeds University psychology （心理学） professor is teaching a course to help dozens of Britons forgive their enemies．
“The hatred we hold within us is a cancer,” Professor Ken Hart said, adding that holding in anger can lead to problems such as high blood pressure and heart disease．
More than 70 people have become members in Hart’s first 20-week workshop in London ─ a course he says is the first of its kind in the world．
These are people who are sick and tired of living with a memory．They realize their bitterness is a poison they think they can pour out, but they end up drinking it themselves, said Canadian-born Hart．
The students meet in groups of eight to ten for a two-hour workshop with an adviser every fortnight．
The course, ending in July, is expected to get rid of the cancer of hatred in these people．“People have lots of negative attitudes towards forgiveness,” he said, “People confuse forgiveness with forgetting．Forgiveness means changing from a negative attitude to a positive one．”
Hart and his team have created instructions to provide the training needed．
“The main idea is to give you guidelines on how to look at various kinds of angers and how they affect you, and how to change your attitudes towards the person you are angry with,” said Norman Claringbull, a senior expert on the forgiveness project．
Hart said he believes forgiveness is a skill that can be taught, as these people “want to get free of the past”．
【小题1】From this passage we know that _________．

A kind of little cars may some day take the place of today’s ones. If everyone drives such cars in the future, there will be less pollution in the air. There will also be more space for parking cars in cities, and the streets will be less crowded. Three such cars can fit in the space now needed for one car of the usual size.
The little cars will cost much less to own and to drive. Driving will be safer, too, as these little cars can go only 65 kilometers an hour.
The cars of the future will be fine for getting around the city, but they will not be useful for long trips. Little cars will go 450 kilometers before needing to stop for more gasoline.
If big cars are still used along with the small ones, two sets of roads will be needed in the future. Some roads will be used for the gig, fast cars and other roads will be needed for the slower small ones.
【小题1】There is much pollution in the air today because ___________.

A．much smaller than	B．much the same as
C．three times as large as	D．a little larger than

A．there will be too many cars in the future

B．more and more people will get around a city

C．bit cars and little cars may be used along with each other

D．it looks more beautiful to have two sets of roads

Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks’ time. Ten inches of rain may be enough for many plants to survive if the rain is spread throughout the year. If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form.

Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes（沙丘）are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs（悬崖）and deep valleys were formed from thick mud that once lay beneath a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing—very, very slowly—as these forces of nature continue to work on the rock.

Most deserts have a surprising variety of life. There are plants, animals and insects that have adapted to life in the desert. During the heat of the day, a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

Many plants may survive in deserts when ________.

    A．the rain is spread out in a year                     B．the rain falls only in a few weeks

C．there is little rain in a year                           D．it is dry all the year round

Sand dunes are formed when _______.

    A．sand piles up gradually                                B．there is plenty of rain in a year

C．the sea has dried up over the years         D．pieces of rock get smaller

The underlined sentence in the third paragraph probably means that in a desert there is ______.

    A．too much sand                                            B．more sand than before

C．nothing except sand                                    D．something else besides sand

It can be learned from the text that in a desert _______.

A．there is no rainfall throughout the year

B．life exists in rough conditions

C．all sand dunes are a few feet high

D．rocks are worn away only by wind and heat