Watching television more than two hours a day early in life can lead to attention problems later in adolescence, according to a study released on Tuesday.
The roughly 40 percent increase in attention problems among heavy TV viewers was observed in both boys and girls. The link was established by a long-term study of the habits and behaviors of more than 1,000 children born in Dunedin, New Zealand, between April 1972 and March 1973.
The children aged 5 to 11 watched an average of 2.05 hours of weekday television. From age 13 to 15, time spent in front of the tube rose to an average of 3.1 hours a day.
"Those who watched more than two hours, and particularly those who watched more than three hours, of television per day during childhood had above-average symptoms of attention problems in adolescence," Carl Landhuis of the University of Otago in Dunedin wrote in his report, published in the journal Pediatrics.
Young children who watched a lot of television were more likely to continue the habit as they got older, but even if they did not the damage was done, the report said.
"This suggests that the effects of childhood viewing on attention may be long lasting," Landhuis wrote.
Landhuis offered several possible explanations for the association.
One was that the rapid scene changes common to many TV programs may over stimulate（刺激）the developing brain of a young child, and could make reality seem boring by comparison. "Hence, children who watch a lot of television may become less tolerant of slower-paced and more mundane tasks, such as school work," he wrote.
It was also possible that TV viewing may supplant other activities that promote concentration, such as reading, games, sports and play, he said.
Previous studies have linked the sedentary固定不動(dòng)的）habit of TV watching among children to obesity and diabetes, and another study in the same journal cited the poor nutritional content of the overwhelming majority of food products advertised on the top-rated US. children's television shows.
Up to 98 percent of the TV ads promoting food products that were directed at children aged 2 through 11 "were high in either fat, sugar, or sodium," wrote Lisa Powell of the University of Illinois in Chicago.
56. The recent survey shows that _________.
A. watching TV can cause all kinds of diseases for children
B. TV sets have played an important part in our daily lives
C. Watching TV over 2 hours a day early in life can cause attention problems later in adolescence
D. watching TV has side effects on children’s future
57. People used to think that _________.
A. watching TV more than 2 hours every day did good to children’s health
B. the sedentary habit of TV watching among children could easily lead to obesity and diabetes
C. the children wasn’t patient with their homework because of watching TV too much
D. it was very important for children to watching TV early in life
58. The underlined word “Hence” means _________.
A. In that case    B. And yet    C. On the contrary    D. For this reason
59. In Landhuis’ opinion, _________.
A. attention problems caused by watching TV during childhood may be hard to get rid of
B. how to develop children’s attention problems is a lasting problem
C. the key of settling attention problems is not watching TV too much
D. there shouldn’t have many food products ads on children's television shows
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：閱讀理解

Imagine being able to recall just about anything, your mind functioning as a nearly endless encyclopedic（百科全書的）book of names, pictures, dates and events.
Brad Williams’ excellent memory recall makes him a personified version（個(gè)人版）of Google. His wide memory allows him to recall almost any news event and anything he has experienced, including specific dates and even the weather. “I was sort of a human Google for my family. I’ve always been able to recall things,” the 51-yearold said on Good Morning America in his first television interview.
Williams’ type of detailed, complete memory is called hyperthymesia and few known cases exist. Brad’s brain scan are now being studied by scientists at the Center for Neurobiology（神經(jīng)生物學(xué)）of Learning and Memory, at the University of California.
At first, the drive-time radio broadcaster didn’t think his ability to recall so much was anything special. Gradually, over the years, other people noticed how much he was able to remember in detail about events. Then in 2006, he read an article about a wman whom scietists called AJ, which prompted Williams to come forward. AJ is a writwer of a medical journal, and the only scientifically-documented case of superior memory.
“When I read about AJ, my immediate thought was : Oh my God. That’s Brad!” said williams’ brother, Eric Williams.
Eric Williams is eager to learn about the inner working of his brother’s mind. He is in the process of making documentary（紀(jì)錄片）about Brad, appropriately titled: “Unforgettable.” In the film, which hasn’t been finished yet, Williams takes on a person who is Googling answers to 20 questions. He answers 18 of them correctly and is 11 minutes faster than the Google user.
“All of us have the ability to store this information, but the difference with Brad is that he can recall it,” Eric Williams said.
小題1:According to the passage, which of the following is true about Brad Williams?
A．He has worked for Google, so he recall any news events.
B．He may be one of the rare cases of people with a superior memory.
C．He is now the host of Good Morning America.
D．He is working as a teacher in California.
小題2:Why does Brad Williams have such a good memory?
A．Because he was born with a rare ability.
B．Because his work requires a good memory.
C．Because he has to answer others’ questions.
D．Because he was specially trained in his chilhood.
小題3:The underlined word “prompted” most probably means _______.
A．helpedB．wantedC．warnedD．encouraged
小題4:The best title for this passage might be ___________.
A．The Ability to Store All Information
B．A Documentary called Unforgettable
C．“Google Man” Recalls Nearly Every Thing
D．Brad Williams and Google User

查看答案和解析>>

科目：高中英語 來源：不詳 題型：完形填空

完形填空(共20小題；每小題1．5分，滿分30分)
閱讀下面短文，掌握其大意，然后從36~55各題所給的四個(gè)選項(xiàng)(A、B、C和D)中，
選出最佳選項(xiàng)。
Come rain or come shine，it’s important to know how to check the weather forecast．A quick
look at the newspaper can  36 whether you should carry an umbrella, sunglasses or a warm coat when you go out．
A weather report usually   37 with the heading“Weather Outlook ”or just  38 
“Weather”．To put as much information as possible into a    39  space，a weather report has
some  40 language．Words ale chosen not for their attractiveness， 41 for their simplicity and directness．
Most forecasts   42   with a“general situation”report of that day’s  43  and some
other useful information．People  44  a weather page rather than  45  a long time on it, so
writers do not need  46 sentences，but make use of verbs，adjectives and adverbs  47 
For example，“Brief sunny periods and heavy thunder showers later．”
48  general forecast is mole detailed information．In Britain，which is a small country，
and the US，which is  49 ，there arc geographical separations like Northern, East coast, and so
on．
There are of course temperature forecasts．Depending On   50   you arc，they will be in Centigrade Of Fahrenheit(華氏)．In Britain temperatures are given in  51 while in the US only Fahrenheit is used．
52  pollution becoming a big problem, many forecasts give the day’s pollution  53 
This may be important for people who are affected by air  54  levels．
There is usually information also On when the sun will  55 ．111is is useful for farmers
and people who get up early．
36．A．know                       B．report                     C．tell            D．see
37．A．comes                     B．talks                        C．deals         D．faces
38．A．really                       B．simply                     C．easily        D．rapidly
39．A．clean                       B．dirty                        C．big              D．small
40．A．unusual                  B．strange                  C．common   D．recent
41．A．a(chǎn)nd                          B．except                    C．but             D．or
42．A．end                          B．begin                       C．close          D．open
43．A．direction                B．pollution                 C．climate     D．weather
44．A．turn                         B．cover                       C．miss           D．scan
45．A．take                         B．spend                      C．cost           D．find
46．A．broken                    B．short                       C．full              D．half
47．A．though                    B．inside                      C．instead     D．either
48．A．Following               B．Preferring              C．Developing        D．Designing
49．A．tiny                          B．large                       C．cold            D．warm
50．A．who                         B．what                       C．where       D．which
51．A．one                          B．a(chǎn)ll                             C．each                    D．both
52．A．With                        B．As                           C．like             D．Since
53．A．a(chǎn)reas                      B．places                     C．limits         D．levels
54．A．energy                    B．strength                 C．quality       D．quantity
55．A．rise                          B．set                           C．burn           D．disappear

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Birds that are half-asleep—with one brain hemisphere (半球) alert and the other sleeping—control which side of the brain remains awake, according to a new study of sleeping ducks.
Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemispheres take turns sinking into the sleep stage characterized by slow brain waves. The eye controlled by the sleeping hemisphere keeps shut, while the wakeful hemisphere’s eye stays open and alert. Birds also can sleep with both hemispheres resting at once.
Decades of studies of bird groups led researchers to predict extra alertness in the end-of-the-row sleepers which tend to be attacked more easily. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference for gaze direction.
Also, birds napping at the end of the line depend on single-hemisphere sleep, rather than total relaxation, more often than inner ducks did. Turning 16 birds through the positions in a four-duck row, the researchers found that compared with 12 percent for birds in internal spots, outer birds half-asleep during some 32 percent of napping time.
“We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness at the same time in different regions of the brain,” the researchers say.
The results provide the best evidence for a long-standing assumption that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be widespread, he predicts. He’s seen it in a pair of birds napping side-by-side in the zoo and in a single pet bird sleeping by a mirror. The mirror-side eye closed as if the reflection were a companion and the other eye stayed open.
Useful as half-sleeping might be, it’s only been found in birds and such water animals as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning.
Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds’ half-brain sleep “is just the tip of the iceberg.” He supposes that more examples may turn up when we take a closer look at other species.
72. According to the passage, birds often half sleep because ______.
A. they have to watch out for possible attacks
B. their brain hemispheres take turns to rest
C. the two halves of their brain are differently structured
D. they have to constantly keep an eye on their companions
73. What is implied about the example of a bird’s sleeping in front of a mirror?
A. An imagined companion gives the bird a sense of security.
B. Birds prefer to sleep in pairs for the sake of their security.
C. The phenomenon of birds napping in pairs is widespread.
D. A single pet bird enjoys seeing its own reflection in the mirror.
74. While sleeping, some water animals tend to keep half awake in order to ______.
A. alert themselves to the approaching enemy
B. emerge from water now and then to breathe
C. be sensitive to the ever-changing environment
D. avoid being swept away by rapid currents
75. By saying “just the tip of the iceberg”, Siegel suggests that ______.
A. half-brain sleep has something to do with icy weather
B. the mystery of half-brain sleep is close to being solved
C. most birds living in cold regions tend to be half sleepers
D. half-brain sleep may exist among other species

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解


If you’re planning on traveling, there are a few simple rules about how to make life easier both before and after your journey.
First of all, always check and double-check departure (行程) time. It is amazing how few people really do this carefully. Once I arrived at the airport a few minutes after ten. My secretary had got the ticket for me and I thought she had said that the plane left at 10:50. When I arrived at the airport, the clerk at the departure desk told me that my flight was closed. Therefore, I had to wait three hours for the next one and missed an important meeting.
The second rule is to remember that even in this age of credit cards, it is still important to have at least a little of the local currency (貨幣) with you when you arrive in a country. This can be necessary if you are flying to a place few tourists normally visit. A few years ago I was sent to Tulsa, Oklahoma. I flew there from London via (經(jīng)由) Dallas, with very little time to change planes in between. I arrived there at midnight and the bank at the airport was closed. The only way to get to my hotel was by taxi and because I had no dollars, I offered to pay in pounds instead.
“Listen! I only take real money!” the driver said angrily. Luckily I was able to borrow a few dollars from a clerk at the hotel, but it was very embarrassing (令人難堪的).
The third and last rule is to find out as much as you can about the weather at your destination before you leave. I feel sorry for some of my workmates who travel in heavy suits and raincoats in May, when it is still fairly cool in London or Manchester, to places like Athens, Rome or Madrid, where it is already beginning to get quite warm during the day.
40. According to the passage, it’s obvious that ______.
A. the author learns some rules of traveling from his own experience
B. the author doesn’t plan his trips or journeys carefully
C. Englishmen like to wear heavy suits wherever they travel
D. the American taxi driver never travels to England
41. What should you make sure first before setting off?
A. When you will leave.      B. Where you will go.
C. How you will travel.        D. Whom you will go with.
42. What does the underlined word “there” in Paragraph 3 refer to?
A. London.            B. Manchester.            C. Tulsa.        D. Dallas.
43. Which of the following is TRUE according to the passage?
A. The author tells people to choose warm places as their travel destinations.
B. You should remember to take credit cards when traveling.
C. You should know more about the weather of the place you’ll visit.
D. You should take enough change when you travel to another country.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Skateboarding has become one of several non-traditional activities that PE teachers around America are introducing to inspire kids to exercise regularly. Some PE classes feature in-line（滾輪） skating, yoga, and even rock climbing. Experts have called those types of activities “the new PE”.
Such activities are part of a larger effort to help kids develop lifelong fitness habits and to keep them from becoming overweight. Now, 9 million U.S. children and teens are overweight. Obesity (肥胖) can lead to health problems such as diabetes and heart disease later in life.
"Our children and youth are becoming unhealthy and obese," says Johnson. "Skateboarding is a great activity that keeps kids doing physical movement and gives them new skills and interest."
Some schools don't allow skateboarding because they say it is dangerous. Tim, however, argues that regular practice eliminates a great deal of the danger. "We teach students how to do it and how to do it safely," he says.
Some people say skateboarding teaches life lessons. “Skateboarding teaches kids to believe that if they stick with something they will finally succeed. ”says education expert Richard Savor from College in Portland.
Skateboarding inspires kids not to give up in learning difficult skills. "It's natural for kids to want to learn and get better at things," adds Tim. "When it comes to skateboarding, they'll try a trick hundreds of times before they succeed." That same effort could be made in schoolwork.
Eric Brown agrees that skateboarding requires kids to stop saying a task is too hard for them. "A baby will attempt to walk 600 to 900 times before he or she is successful," says Eric, "We tell students that they shouldn't say 'I can't do it' unless they've tried 600 to 900 times.
72. Skateboarding is introduced into American schools to ______________.
A. encourage students to compete bravely in competition  
B. teach students how to deal with risk.
C. prevent students suffering from heart disease later in life.
D. help students form the habit of doing sports
73. The underlined word "eliminates" in Paragraph 4 probably means ______________.
A. reduces.         B. increases         C. adds        D. brings
74. What life lesson do kids learn from skateboarding?
A. To succeed in life you have to learn skateboarding.
B. You will succeed in life if you don't give up.
C. Only after failing 600 to 900 times can you succeed.
D. There is no hard work after learning skateboarding well.
75. What would be the best title for the passage?
A. The dangerous PE            B. Skills of skateboarding.  C. The new PE.      D. The change of PE.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

       There are many ways to find a job. Local stores often have areas where people can put small signs telling what kind of service they need or can provide. Such services include caring for children or cleaning houses.
Or, job searchers can look in the newspaper. Local newspapers have employment announcements placed by companies seeking workers.
Another popular tool for finding jobs is the Internet. For example, people in four hundred and fifty cities around the world can use the Craigslist Web site to buy objects, meet people or find a job. Craigslist says that it receives two million new job listings each month.
Another useful way to find a job is through a college or university. For example, students at the University of Texas can go to the Career Exploration Center to get help in finding a job. Of course, looking for a job requires knowing what kind of work you want to do. For example, there is a book called “What Color is Your Parachute (降落傘)?” by Richard Bolles. This book has been helping people choose a career (職業(yè)) since it was first published in nineteen seventy.
Some experts also help people find jobs. Susan W. Miller owns a company called California Career Services in Los Angeles. She says her company helps people find jobs by first helping them understand their advantages, goals and interests. Then she provides them with methods and resources to help them find the right job.
61. What is the passage mainly about?
A. Finding a job.                           B. College students’ part-time jobs.
C. Craigslist Web site.                       D. The relation between study and work.
62. By logging on the Craigslist Web site, you can ______.
A. sell your old things                      B. do some shopping online
C. create your own announcement board        D. get useful information about 450 cities
63. “What Color is Your Parachute?” is a book which gives tips to those who want to _____.
A. work on the airplane    B. buy a parachute    C. publish a book   D. find a suitable job
64. It can be learned from the passage that ______.
A. companies often put job information in local shops
B. the Internet is the most popular tool for job hunters in the USA
C. Susan W. Miller’s company is helping people choose careers
D. California Career Services mainly serves university students
65. How many ways of finding a job are mentioned in the passage?
A. Three.              B. Four.           C. Five.                D. Six.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

When you take a walk in any city, you often see a lot of people walking dogs. It is still true that a dog is the most useful and faithful animal in the world, but the reason why people keep a dog has changed. In the old days people used to train dogs to protect(保護(hù)) themselves against attacks by other beasts. Later they came to realize that a dog was not only useful for protection but willing to obey his master. For example, when people used dogs for hunting, the dogs would not eat what was caught without permission.
These days people in the city need not protect themselves against attacks from animals. Why do they keep dogs, then? Some people keep dogs to protect themselves from robbery（搶劫）. But the most important reason is for companionship. For a child, a dog is a best friend when there are no friends to play with. For young couples, a dog is their child when they have no children. For old couples, a dog is also their child when their natural children have grown up. So the main reason why people keep dogs has changed from protection to friendship.
67. According to the passage, in the old days people trained dogs ______ .
for protection against robbery
just for fun
for companionship
for protection against other animals
68. The word "companionship" may mean ______ .
A. native     B. advice     C. friendly relationship（關(guān)系） D. usage
69. The dogs were used for hunting because ______ .
A. they were good hunters
B. they obeyed their masters
C. they were useful for protection
D. they did not eat other animals
70. The most important reason for people to keep dogs now is they ______ .
A. need companion
B. like children
C. enjoy hunting
D .want to protect themselves
71. We can infer from the passage that ______ .
A. dogs can be helpful to those who need company
B. city people always feel lonely
C. dogs can be boring （厭煩的）
D. the city can be a very dangerous place

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

       What should you think about in trying to find your career? You are probably better at some school subjects than others. These may show strengths that you can use in your work. A boy who is good at mathematics can use that in an engineering career. A girl who spells well and likes English may be good at office work. So it is important to do well at school. On the other hand, you may not have any specially strong or weak subjects but your records show a general satisfactory standard. Although not all subjects can be used directly in a job, they may have indirect value. Knowledge of history is not required for most jobs but if history is one of your good subjects you will have learned to remember facts and details. This is an ability that can be useful in many jobs.
Your school may have taught you skills, such as typing or technical drawing, which you can use in your work. You may be good at metal work or cookery and look for a job where you can improve these skills. 
If you have had a part-time job on Saturdays or in the summer, think what you gained from it. If nothing else, you may have learned how to get to work on time, to follow instructions and to get on with older workers. You may have learned to give correct change in a shop, for example. Just as important, you may become interested in a particular industry or career you see from the inside in a part-time job.  
Facing your weak points is also part of knowing yourself. You may be all thumbs when you handle tools. Perhaps you are a poor speller or cannot add up a column of figures. It is bitter to face any weaknesses than to pretend they do not exist. Your school record, for instance, may not be too good, yet it is an important part of your background. You should not be apologetic about it but instead recognize that you will have a chance of a fresh start at work.
51. We can infer from the first paragraph that_______.
A. learning better at school shows power in your job
B. the better you are at school subjects, the more helpful they are in your career
C. learning each subject well is an ability in many jobs
D. we should think about how to find our career
52. According to the passage, if a student’s school record is not good, he will _________.
A. have no hope in his future work
B. be hopeful to find a suitable job
C. regret not having worked harder at school
D. have an opportunity of a new beginning in his future work
53. All the subjects may have direct value for job hunting except___________.
A. mathematics          B. English          C. history           D. technical drawing
54. The underlined words "all thumbs" in Paragraph 4 most probably mean_________.
A. heavy-handed         B. the best            C. important       D. skilled
55. The passage mainly discusses ___________.
A. the relationship between school performance and career
B. how to get a job
C. how to show strengths in your work
D. working experience and knowledge at school

查看答案和解析>>

同步練習(xí)冊答案