Millions of people are using cell phones today.In many places it is actually considered unusual not to use one.In many countries,cell phones are very popular with young people.They find that the phones are more than a means of communication--having a mobile phone shows that they are cool and connected. The explosions around the world in mobile phone use make some health professional worried.Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones.In England,there has been a serious debate about this issue.Mobile phone companies are worried about the negative publicity of such ideas.They say that there is no proof that mobile phones are bad for your health. On the other hand,why do some medical studies show changes in the brain cells of some people who use mobile phones?Signs of change in the issues of the brain and head can be _ with modern scanning equipment.In one case,a traveling salesman had to retire at a young age because of serious memory loss.He couldn't remember even simple tasks.He would often forget the name of his own son.This man used to talk on his mobile phone for about six hours a day,every day of his working week,for a couple of years.His family doctor blamed his mobile phone use,but his employer's doctor didn't agree. What is it that makes mobile phones potentially harmful?The answer is radiation.Hightech machines can detect very small amounts of radiation from mobile phones.Mobile phone companies agree that there is some radiation.But they say the amount is too small to worry about. As the discussion about their safety continues,it appears that it's best to use mobile phones less often.Use your regular phone if you want to talk for a long time.Use your mobile phone only when you really need it.Mobile phones can be very useful and convenient,especially in emergencies.In the future,mobile phones may have a warning label that says they are bad for your health.So for now,it's wise not to use your mobile phone too often. On the safety issue of mobile phones,the manufacturing companies _ . A) deny the existence of mobile phone radiation B) develop new technology to reduce mobile phone radiation C) hold that the amount of radiation is too small to worry about D) try to prove that mobile phones are not harmful to health
C
Only if you don't have a fear of heights do you want to visit the CN Tower. And if you can take a trip to the top of it will surely be worth it. The CN tower is Canada's most famous symbol and the centre of tourism in Toronto. Over 550 meters, it is one of the tallest building in the world; on a clear day the view is wonderful. Each year, around 2 million people take the elevator ride to the top of the tower to take in the breath-taking view at the top of the world. Once you are at the top, see if you have the courage to walk across the see-through glass floor . If you are hungry, plan to eat at the revolving restaurant at the top of the tower. The floor in the 360-degree restaurant rotates once every 72 minutes allowing everyone a complete view of the city below. The CN tower has broken record many times, winning such titles as World's Longest Metal staircase ,World's Tallest building and , most recently , World's Highest Wine Cellar. In 1995, the CN tower was considered as one of the seven wonders of the Modern World. Today, the top of the tower, more than 333m in the air, serves as the year-round workplace for more than 550 people. The tower's workers help to make the world-class attractions and food there. While at the CN tower, you'll also have the chance to visit gift shops. You will find the CN Tower in the heart of downtown, on Front Street. On the north shore of Lake Ontario, the CN Tower is open 364 days a year(closed on Christmas Day). How many titles has the Tower got? A) 2 B) 3 C) 4 D) 5
C
Q: Dogs have long been used to find explosives and drugs.Now,a new study shows that man's best friend can also help to find lung and breast cancer,researchers report in integrative Cancer Therapies.The findings show that trained ordinary household dogs can detect early--stage lung and breast cancers by smelling the breath samples of patients. Researchers have found that cancer cells send out molecules different from those of healthy ones,and that might be sensed by smell by the highly sensitive dog's nose. For the study,five dogs were trained by a professional instructor to respond differently to breath samples of healthy and cancer patients."The dogs learned to sit or lie down in front of cancer patient samples and to ignore control samples through the method of food reward," McCulloch explained. After a period of training,researchers tested the animals'ability to distinguish cancer patients from controls.The animals were given breath samples from 55 patients with lung cancer,3 1 with breast cancer and 83 healthy controls who were not included in the original training period. McCulloch's group found that the dogs were able to correctly distinguish the breath samples of cancer patients from those of the control subjects in about 90 percent of the cases.The dogs were also able to detecting early-stage lung and breast cancers. "These results show that there is hope for early detection,"McCulloch said.The re-searches are planning to conduct further studies on the breath composition of cancer patients to possibly design an electronic device that can do the dogs'job."A dog's nose is so powerful it can detect odors 10 000 to 100 000 times better than a human nose can.I hope people will be interested in doing this research,"McCulloch added,"It shows that there is definitely something out there." Which of the following would be the best title? A) Special Noses of Dogs B) Dogs and Cancer C) Dogs Smell Signs of Cancer D) McCulloch'S New Discovery
A: C
"It hurts me more than you," and "This is for your own good." These are the statements my mother used to make years ago when I had to learn Latin, clean my room, stay home and do homework That was before we entered the permissive period in education in which we decided it was all right not to push our children to achieve their best in school. The schools and the educators made it easy to us. They thought that it was all right to be parents who take a let-alone policy. We stopped making our children do homework. We gave them calculators, turned on the television, left the teaching to the teachers and went on vacation. Now teachers, faced with children who have been developing at their own pace for the past 15 years, are realizing we've made a terrible mistake. One such teacher is Sharon Klompus who says of her students - "so passive" - and wonders what happened. Nothing was demanded of them, she believes. "Television," says Klompus, "contributes to children's passivity. We're not training kids to work any more. We're talking about a generation of kids who've never been hurt or hungry. They have learned somebody will always do it for them. Instead of saying 'go look it up', you tell them the answer. It takes greater energy to say no to a kid." Yes, it does. It takes energy and it takes work. It's time for parents to end their vacation and come back to work. It's time to take the car away, to turn the TV off, to tell them it hurts you more than them but it's for their own good. It's time to start telling them "no" again. By "permissive period in education" the author means a time A) when every child can be educated B) when everything can be taught at school C) when children are permitted to receive education D) when children are allowed to do what they wish to
D