Millions of people now use computers for many different things---communication, study and so on. Of course, computers are great and have   (1)   some people’s lives for the better.  (2)   , they can cause problems too. Many people who use computers a lot can develop    (3)   problems. They find that they eyesight gets    (4)   , for example, if they look at the screen for too long. Users’ hands and arms can become   (5)   from making the same movements thousands of times, while using a keyboard and a mouse. People who have computers are also spending more   (6)   sitting down, and less time   (7)   , so many of them are becoming overweight.    

 Other problems are psychological(心理上的).  Computers, the Internet and email have made people’s lives much   (8)  . This can be very exciting,    (9)    it also means that people feel under a lot of pressure(压力) to do everything more quickly.    

Addiction(上瘾) is also a   (10)   with more and more young people. Many of them spend hours and hours    (11)   different websites, sometimes until very late   (12)  . This means they can’t work or study  (13)   and can have problems keeping friends. Some studies in the United States have  (14)  that young children and teenagers who spend many hours at computers can easily get   (15)  .

“Computers can be a really   (16)   part of children’s lives because they can be   (17)   for research, finding pictures and reading the latest news. But parents and teachers need to   (18)   children to learn how to use computers in   (19)  ways,” says teacher Jane Shields.  “ And children need to learn when it’s time to   (20)  and do something different.”

 阅读下面短文,从短文后各题所给的四个选项(A、B、C、D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

   Kids perform differently in school. Their performances vary, even if they have  _（1）___ personalities or come from the same background. _（2）___, this kind of phenomenon is caused by many factors. Recently, a new study of Nova Scotia fifth-graders _（3）___that kids who eat better perform _（4）___in school. Students who ate an adequate amount of fruit, vegetables, protein, fiber and other components of a  _（5）___ diet were significantly less likely to  _（6）___ a literacy test, Dr. Paul found.

   While a healthy diet is _（7）thought to be important for good school  _（8）, there has actually been little study on this _（9）, Paul and his colleagues noted. To investigate, they looked at 4,589 fifth-graders _（10）_ in the Children's Lifestyle and School Performance Study, 875 (19.1 percent) of whom had failed an elementary literacy assessment  （11）_the majority had passed it.

   The researchers found, students' good eating habits are based on their diet   (1)  , including adequacy and variety. If the kid   (2)  enough and abundant nutrients in the daily life, he or she will be more likely to do well in the test,  _（14）after the researchers adjusted the data for the effects of  _（15）__income and education, school, and sex. Eating plenty of fruit and vegetables, and getting fewer calories from fat, was also  _（16）_with a lower risk of failing the test.

   Till now, Paul and his _（17）_ say, most researches on diet and school performance have only  _（18）___on the importance of eating breakfast, as well as the bad  _（19）___ of hunger and malnutrition(营养不良). "This study extends current knowledge in this area. It shows us the importance of overall diet quality to academic results," the researchers  _（20）___.

In the past, man did not have to think about the protection of his environment. There were few people on the Earth, and__  (1)  __resources seemed to be__  (2)  _.

Things are now__  (3)  __. The world has become too__  (4)  __. We are_  (5)  _up our natural resources too quickly, and at the same time we are__  (6)  __our environment with dangerous chemicals. If we continue to do this, human life on the Earth__  (7)  _not survive.

Everyone__  (8)  __today that if too many fish are taken from the sea, there will soon be none__  (9)  __. Yet, with modern fishing__  (10)  __， more and more fish are caught. We know that if too many trees are cut__  (11)  __，__  (12)  __will disappear and nothing will grow on the land. Yet, we___  (13)  _to use bigger and more__  (14)  _machines to get more and more trees.

We realize that if rivers are polluted with waste products from factories, we will die. __  (15)  __， in most countries wastes are__  (16)  __put into rivers or into the sea, and there are__  (17)  __laws to stop this.

We know，__  (18)  _， that if the__  (19)  _of the world continues to rise at the present rate, in a few years there will not be enough__  (20)  _.

What can we do to solve these problems?

In the United States today , a large group of people want a college education .   (1)   , everyone is not able to   (2)   a four-year college . Many four-year colleges are already too   (3)  . To give more people a chance   (4)  a college education , some   (5)  and towns have built junior colleges .         

The junior colleges   (6)  a two-year course of study in a wide range of subjects . It prepares some   (7)   people to go on a four-year college . It   (8)   others for jobs in business , government , or industry .

    (9)  junior colleges are built in cities , they can  (10)   the many people who live in a large community . Many students  (11)   not afford to go to a four-year college . But they can save   (12)   to go to junior college . The entrance fee at a junior college is   (13)   . Students can also save money by living at   (14)   .       

A junior college   (15)   some high school graduates  (16)   would not be accepted at other schools . The four-year college  (17)  students whose high school   (18)   are low . The junior college is a school   (19)   to serve many people . It puts a college education within the reach of a number of people .   (20)   these schools , many people would not be able to continue their education past high school .

The part of the environmental movement that draws my firm's attention is the design of cities, buildings and products. When we designedAmerica's first so-called "green" office building in New York two decades __（1）__, we felt that we were alone. But today, thousands of people come to green building conferences, and the _  (1)  _that buildings can be good for people and the environment will be increasingly influential in years to _  (2)  _ .

Back in 1984, we discovered that most products for decoration weren’t designed for   (3)  _use. The “energy-efficient” commercial buildings constructed after the 1970s _  (4)  _crisis revealed indoor air quality problems caused by materials such as paint, wall covering and carpet. So far 20 years, we’ve been   (5)  _ on these materials down to the molecules(分子), looking for ways to make them __  (6)  _ for people and the planet.

Home builders can now use materials—such as paints that release significantly   (7)  _ amounts of organic compounds(有机化合物) —that don’t   (8)  _ the quality of the air, water, or soil. Eventually, _  (9)  _, our basic design strategy is focused not simply on being “less bad” but on creating   (10)  _ healthful materials that can be either safely returned to the soil _  (11)   reused by industry again and again. As a matter of   (12)  _, the world’s largest carpet manufacturer has already _  (13)   a carpet that is fully and safely recyclable.

Look at it this way: No one   (14)   out to create a building that destroys the planet. But our _  (15)  _ industrial systems are inevitably(不可避免地) causing these conditions, whether we like it or not. So _  (16)   of simply trying to reduce the damage, we are _  (17)  _ a positive approach. We’re giving people high-quality, healthful products and an opportunity to make choices that have a _  (18)   effect on the world. It’s not just the building industry, either. Entire cities are taking these _  (19)  _ positive approaches to design, planning and building.Portland,Seattleand Boston have said they want to be green cities. Chicago wants to be the greenest city in the world.

More and more people in the United States are becoming couch potatoes. This doesn’t  (1)   they can be cooked and eaten. The

  (2)    potato is a lot more useful than a lazy person that just sits on his sofa  (3)   TV programmes. One of the reasons why obesity rates(肥胖率) are  (4)   is that more and more fun is available on television is not just for watching shows. People can watch movies, play video games, and  (5)   surf the Internet through the TV as well. When most people are on their couches with the remote control in hand, they are also often   (6)   different foods. Being a couch potato can have other problems besides  (7)    gain. Because more and more people are sitting in front of television screen or even a computer screen, they don’t   (8)   sporting activities. This is one reason why heart disease is a main  (9)   of death in the country. Being   (10)    of exercise and increased screen time also result in

  (11)   bodies. Sitting inside in front of a screen usually means a person  (12)   time communicating with friends and loved ones. This can  (13)    loneliness, stress, and anxiety.

 Being a couch potato is not just for adults. More and more kids are interested in television and the Internet. This is why more and more children have different  (14)   problems. This is why the White House has programs like Let’s move,   (15)    kids to take part in sporting activities.

It is not polite to arrive at a dinner party more than 15 to 20 minutes late. The host or hostess usually waits for all the guests to arrive before  (1)  the meal. If someone is late, the food may be spoiled, and so might the host or hostess’s  (2)  .If you have to be late, call and tell them to  (3)  you.

It’s even  (4)  to be early! The host or hostess will probably not be  (5)  .If you are early, drive or walk around the block a few times, or just sit in your car  (6)  the right time.

Though it is often important to arrive on time, yet  (7)  , for open houses, the host or hostess invites guests to arrive and leave  (8)   a certain time. You can arrive at any time

  (9)  the time he or she gives you.

It’s polite to bring an empty stomach, but it’s even nicer to bring a small present. The present should not cost  (10)  , or you might embarrass the host or hostess. Flowers, wine, or a box of candy will  (11)  . Never bring money as a present.

In an introduction, the order of a name: (1) the given name, (2) the family name. In other words the given name comes  (12)  . It’s important not only to learn and remember names, but to   (13)   them often in conversation. After the  (14)  we usually call friends by their given names.  (15)  may want you call them by their titles and  (16)  , such as “Mr. Jones” “Mrs. Johnson” or “Dr. Brown”.

A maiden name（婚前姓）is a woman’s family name  (17)  . In the United States and Canada, after a woman marries, she  (18)  the family name of her husband  (19)  her maiden name. It is now becoming  (20)  , however, for women to keep their maiden names after getting married.

Two runners stand side by side at the starting line of a race．Both look very strong and fast．But one runner speeds ahead and wins the race．The other falls behind．

 Some sportsmen can reach great goals such as the achievement of an Olympic gold medal while others  (1)  live up to their promise．What kind of preparation before a race or other event makes the  (2)  ?

 Everyone knows that sportsmen work out to strengthen(加强)their   (3)  . But research shows that strengthening the mind may be just as important．Careful study shows that the best sportsmen win  (4)  because they think they can win.

 Thinking positive(乐观的)thoughts seems to give possibility for   (5)   in sports. People who say to themselves over and over，“I know I can do this，”often find they have the advantage to win．on the other hand，people who think“I can’t win”often   (6)  .

One procedure(步骤)that helps many sportsmen is creating   (7)  in the mind. They are to1d to think of each move they must make to win．Some use pictures that are more fanciful. One skater liked to imagine a star bursting inside her，  (8)   her with energy. Another sportsman who wanted to feel calm pictured himself as a bird floating(漂浮)in the air．

Next time you want to do something well，try training your  (9)  to help you．Perhaps a teacher or other instructor can help you plan your training．If you imagine yourself doing better，you may soon see improvement in what you  (10)  can do．Positive thinking and picture created in your mind can help you win !

 In our modern world, when something wears out, we throw it away and buy a new one. The   (1)  is that countries around the world have growing mountains of   (2)   because people are throwing out more rubbish than ever before.

  How did we   (3)  a throwaway society? First of all, it is now easier to     (4)  an object than to spend time and money to repair it.   (5)  modern manufacturing (制造业) and technology, companies are able to produce products quickly and inexpensively. Products are plentiful and  (6)  .

  Another cause is our   (7)  of disposable (一次性的) products. As   (8)   people, we are always looking for  (9)  to save time and make our lives easier. Companies   (10)  thousands of different kinds of disposable products: paper plates, plastic cups, and cameras, to name a few.

  Our appetite for new products also_  (11)  to the problem. We are  (12)  buying new things. Advertisements persuade us that  (13)  is better and that we will be happier with the latest products. The result is that we  (14)   useful possessions to make room for new ones.

  All around the world, we can see the   (15)   of this throwaway lifestyle. Mountains of rubbish just keep getting bigger. To   (16)   the amount of rubbish and to protect the   (17)  , more governments are requiring people to recycle materials.   (18)  , this is not enough to solve (解决) our problem.

 Maybe there is another way out. We need to repair our possessions   (19)   throwing them away. We also need to rethink our attitudes about   (20)  . Repairing our possessions and changing our spending habits may be the best way to reduce the amount of rubbish and take care of our environment.