A new study suggests that the more teenagers watch television, the more likely they are to develop depression as young adults．But the extent to which TV may or may not be to blame is a question that the study leaves unanswered．

The researchers used a national long-term survey of adolescent health to investigate the relationship between media use and depression．They based their findings on more than 4,000 adolescents who were not depressed when the survey began in 1995．

As part of the survey, the young people were asked how many hours of television or videos they watched every day．They were also asked how often they played computer games and listened to the radio．

Media use added up to an average of five and one-half hours a day．More than two hours of that was spent watching TV．

Seven years later, in 2002, more than seven per cent of the young people had signs of depression．The average age at that time was twenty-one．

Brian Primack at the University of Pittsburgh medical school was the lead author of the new study．He says every extra hour of television meant an eight per cent increase in the chances of developing signs of depression．

The researchers say they did not find any such relationship with the use of other media such as movies, video games or radio．But the study did find that young men were more likely than young women to develop depression given the same amount of media use．

Doctor Primack says the study didn’t explore if watching TV causes depression．But one possibility, he says, is that it may take time away from activities that could help prevent depression, like sports and socializing．It might also interfere with sleep, he says, and that could have an influence．

The study was just published in the Archives of General Psychiatry．

In December, the journal Social Indicators Research published a study of activities that help lead to happy lives．Sociologists from the University of Maryland found that people who describe themselves as happy spend less time watching television than unhappy people．The study found that happy people are more likely to be socially active, to read, attend religious services and to vote．

51．According to the first paragraph,what remains unsolved in the new study?

A．Who is more likely to be influenced by TV

B．How much teenagers are depressed by TV

C．Whether teenagers are influenced by TV

D．What should be done to help to help the teenagers

52．More than 4,000 adolescents were chosen as the subjects of the study because they      ．

A．were free from depression

B．were keen on using the media

C．attached much importance to their health

D．could afford the time for the long term survey

53．What can be inferred from the seventh paragraph?

A．Depression is not related to the use of other media than TV

B．Every extra hour of media uses increases the chance of depression

C．Longer use of media other than TV doesn’t increase the chance of depression

D．The influence of movies,video games and radio on depression varies respectively

54．In the last sentence of the eighth paragraph, “It”refers to      ．

A．depression     B．watching TV     C．lack of activities     D．the result of the study

55．The study done by the sociologists from the University of Maryland was mainly intended to      ．

A．tell the difference between happy and unhappy people

B．prove the realationship between TV and depression

C．stress the importance of being socially active

D．provide a happy recipe（秘方）for all people

      Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.

      Behind our house is the start of a fascinating trail (小径). This trail is one of the old roads that wind through untold miles of forest. My   1, Beans, and I walk the trail frequently. Normally, Beans sniffs alongside the trail to follow the smell of a deer track or   2some cause known only to him.

      Beans is a white dog, quite handsome and very   3. He not only understands what we tell him, but also often makes sounds as if he were trying to   4back.

      One morning, we took a different route, which led us to an unfamiliar trail. I was sure this trail would eventually lead us to our familiar   5. But, no. We seemed to be far off course. After two hours, I suddenly realized that Beans probably   6the way home. So I urged, "Beans, take me home." He ran down a new trail. But it merely led to an intersection (岔道口) of trails.

      Soon it became   7that we were getting nowhere. I began to picture the rest of the day in the   8, without food or drink. We had walked about ten miles. But Beans seemed totally   9. The sniffing and exploring was going well for him.

     Finally, we   10a crossroad near a highway. Lady Luck suggested I should turn left. We did and   11reached a cottage beside a field. I knocked on the door and explained my situation to an old man. He laughed and then drove us home.

     Since our adventure, I   12that Beans probably knew all along how to get home. He was just having too much fan exploring new trails.

1.A. deer               B. dog             C. lady             D. man     

2.A. imagine            B. consider             C. explore              D. present 

3.A. smart              B. sweet            C. slow             D. shy     

4.A. turn               B. kick             C. jump             D. speak       

5.A. driveway           B. path                 C. crossroad            D. highway 

6.A. knew               B. saw             C. showed           D. made    

7.A, mysterious         B. ridiculous           C. fascinating          D. apparent

8.A. house              B. forest               C. field                D. cottage 

9.A. unconcerned        B. unconscious     C. undecided       D. uncomfortable

10.A. left for              B. went off             C. came to         D. drove toward

11.A. punctually        B. frequently           C. formally        D. shortly 

12.A. regretted             B. remembered      C. concluded       D. confirmed   

The requirements for high school graduation have just changed in my community. As a result, all students must   36  sixty hours of service learning,   37  they will not receive a diploma（文凭）.    38   of service learning include cleaning up a polluted river, working in a soup kitchen, or tutoring a student. During a service experience, students must keep a journal and then write a  39  about what they have learned.

Supporters state that there are many   40 of service learning. Perhaps most importantly, students are forced to think   41 their own interests and become aware of the needs of others. Students are also able to learn real-life skills that   42  responsibility, problem-solving, and working as part of a team. Finally, students can explore possible careers 43  service learning.

For example, if a student wonders what teaching is like, he or she can choose to work in a primary school classroom a few afternoons each month.  44  there are many benefits, opponents （反对者） point out problems with the new requirement. First, they   45 that ,because service learning is time-consuming, students spend   46  time studying the core subjects. Second, they believe that forcing students to work without   47  goes against the law.

In my view, service learning is a great way to   48  to the community, learn new skills, and explore different careers.  49  , I don' t believe you should force people to help others – the  50  to help must come from the heart. I think the best solution is one that gives students choices. Choice encourages both freedom and responsibility.

Peanut allergies (过敏) are among the most common and most dangerous of food allergies. A tiny exposure to peanuts can mean big trouble for a person with a peanut allergy—not just sneezing or coughing，but something as potentially deadly as narrowing of the airways.

But a recent study suggests that some children may be able to beat back their allergic reactions to peanuts by gradually introducing trace amounts of the nut into their diets. It's too early to say for certain，so if you have a peanut allergy，do not try this at home. But the first results look promising.

Two teams of scientists have been experimenting on a group“of 29 children who are allergic to peanuts”At the beginning of the study，each kid received less than 1/1，000 of a peanut per day. (Imagine splitting a peanut into 1，000 parts!) Over the course of the study， the children gradually increased the amount of the peanut in their diets

Nine of the children have been receiving the treatment for two years，and five of those nine now appear to be free of their peanut allergies，and can eat peanuts with no problem. But the other four have not benefited so much from the therapy（治疗）.

The two teams of scientists are now doing a follow-up study on two groups of children with the allergy. Children in one group will receive the new therapy，while the others will not. Researchers hope this study will help them learn if the therapy truly does work.

Scientists don't understand why some people get peanut allergies and others don't，but are trying to find a way to help people with the allergy. Because of the severity of some peanut allergies，scientists want to know the answer as soon as possible. “This is very encouraging， but remember，it's not something you try at home，”says one of the researchers.

68.According to the passage，the peanut allergy     .

A. can be deadly if only a small amount is used

B. causes a lot of trouble for many parents

C. allows people to eat only small amounts of peanuts

D. is considered the least common and dangerous food allergy

69.Scientists are trying to treat peanut allergies by     .

A. exposing children with the allergy to as many peanuts as possible

B. changing the eating habits of children with peanut allergies gradually

C. giving children Peanuts in slowly increasing amounts

D. exploring ways to resist the feelings caused by peanut allergies

70.The experiment shows that     . 

A. people with peanut allergies can't use small amounts of peanuts in their diets.

B. children are more easily cured than adults

C. all children can be cured of their peanut allergies if given more time of treatment

D. about 55-percent children with peanut allergies have been cured

71. Scientists are now doing a follow-up study in order to     .

A. explore why some people get the illness while others don’t

B. show whether peanut allergies can really be dangerous

C. check whether the therapy really works or not

D. explore whether the allergy can be cured without treatment

Man, a land animal. But he is also closely tied to the sea. Throughout history the sea has served the needs of man. The sea has provided man with food and a convenient way to travel to many parts of the world. Today, nearly two-thirds of the world’s population live within 80 kilometers of the sea coast.

    In the modern technological world, the sea offers many resources to help mankind survive. Resources on land are beginning to be used up. The sea, however, still can be hoped to supply many of man’s needs.

    The list of riches of the sea yet to be developed by man’s technology is big. Oil and gas explorations have been carried out for nearly 30 years. Valuable amounts of minerals exist on the ocean floor ready to be mined.

    Fish farming promises to be a good way to produce large quantities of food. The culture of fish and shellfish (贝类动物) is an ancient skill practised in the past mainly by Oriental people, including people in China.

    Besides oil and gas, the sea may offer new sources of energy. Experts believe that the warm temperature of the ocean can be used in a way similar to the steam in a steamship. Ocean currents and waves offer possible use as a source of energy.

    Technology is enabling man to explore ever more deeply under the sea. The development of strong, new materials has made this possible.

    The technology to harvest the sea continues to improve. Experts believe that by the year 2020 the problems that prevent us from exploiting（开发） fully the food, minerals, and energy sources of the sea will be largely solved.

1.The major things that the sea offers man are ______.

A. fish and oil                        

B. minerals and oil

    C. warm temperature and ocean currents   

D. the food, energy sources, and minerals

2.We can conclude from this passage that ______.

    A. the sea resources have largely been used up

    B. the sea, in the broad sense, has not yet been developed

    C. the problems that prevent us from using the food, minerals, and energy sources of the sea have already been solved.

    D. by the year 2020, the technology will be good enough to exploit all the sea resources

3.The underlined words “Oriental people” in the fourth paragraph probably mean ______.

    A. the people in Asia                       B. African people

    C. European people                          D. American people

4.The best title for this passage is ______.

    A. Sea Harvest                              B. Sea Food

    C. Technology for Exploiting the Sea            D. Man and the Sea