Holding a cell phone against your ear or storing it in your pocket may be dangerous to your health. This explains a warning that cell phone manufacturers(制造商) include in the small print (印刷字体) that is often ignored when a new phone is bought. Apple, for example, doesn't want iPhones to come closer to you than 1.5 centimeters; Research In Motion, Black Berry, a manufacturer, recommends 2.5 centimeters.
If health issues arise from cell phone use, the possible effects are huge. Voice calls Americans chat on cell phones 2.26 trillion(万亿)minutes annually earn $109 billion for the wireless carriers.
Devra Davis, an expert who has worked for the University of Pittsburgh, has published a book about cell phone radiation, “Disconnect”. The book surveys scientific research and concludes the question is not settled.
Brain cancer is a concern that Ms.Davis examines. Over all，there has not been an increase in its incidence since cell phones arrived. But the average masks an increase in brain cancer in the 20 to 29 age group and a drop for the older population.
“Most cancers have multiple causes,” she says，but she points to laboratory research that suggests low energy radiation could damage cells that could possibly lead to cancer.
Children are more vulnerable(易受伤的)to radiation than adults, Ms.Davis and other scientists point out. Radiation that penetrates only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls are thinner and their brains contain more absorptive fluid(易吸收的液体). “No studies have yet been completed on cell phone radiation and children,” she says.
Henry Lai, a research professor in the bioengineering department at the University of Washington, began laboratory radiation studies in 1980 and found that rats exposed to radiation had damaged DNA in their brains.
Ms.Davis recommends using wired headsets or the phone's speaker. Children should text rather than call, she said, and pregnant women should keep phones away from the abdomen(腹部)．
【小题1】Why is the warning in the small print?| A．They don't want the users to pay attention to it. | B．There is not enough space for the warning. |
| C．They think people will not care about it. | D．The warning is not important at all. |
| A．Because they haven't grown up. | B．Because they are too young to protect themselves. |
| C．Because they use cell phones more often than adults. | D．Because their skulls are thinner and their brains are easily hurt. |
| A．Pregnant women should keep cell phones away. |
| B．People should use cell phones in the correct way. |
| C．If you are a child, you'd better text than make phone calls. |
| D．When you use a cell phone，use a wired headset or the phone's speaker. |
| A．Be careful when using cell phones. |
| B．Don't hold your cell phone against your ear. |
| C．Rats exposed to radiation have damaged DNA in their brains. |
| D．Low energy radiation could damage cells that could lead to cancer. |
If you ever have the desire to break out into song—in the shower，in the car，maybe at your neighbor's karaoke night—you should embrace it whole—heartedly. This ancient art not only makes you feel good，it can also improve your well-being，reduce your feelings of pain，and even extend your life.
Using your voice to sing，rather than simply carryout a conversation，offers unique benefits because singing affects our bodies. Also，studies link singing with a lower heart rate，decreased blood pressure and reduced stress according to Patricia Preston-Roberts，a music therapist（治疗专家）.（1）
Singing，particularly in a group，seems to benefit the elderly particulartly well. As part of a three一year study examining how singing affects the health of those fifty-five and older，a Senior Singers Chorus was formed by the Levine School of Music in Washington.D.C. The seniors involved in the chorus，as well as seniors in two separate arts groups about writing and painting，showed significant health improvements compared to those in the control groups（对照组）. Obviously，the arts groups reported thirty fewer doctors' visit，fewer eyesight problems，less depression，and less need for medication.（2）
Even lead researcher Dr.Gene D.Coben，director of the Center on Aging at George Washington University，was surprised at how big an effect the seniors' arts participation had on their health. Coben said，“The average age of all the subjects was eighty. This is higher than life expectancy. So，if an effect were to be achieved，one would ordinarily expect to see less decline（下降）compared to the control group. The fact that there was so much improvement in many areas was the surprising factor.”（3）The seniors also noticed health improvements and they reported feeling better both in daily life and while singing.
The part of the brain that works with speech is different from the part that processes music.“People seem to enjoy doing something jointly with other people. There are a lot of facts that being socially involved is good for people with dementia（老年痴呆）.” Ballard said.
The arts are showing up as a treatment tool in hospitals across the country.（4）If you are thinking of volunteering，singing at a hospital may be a good choice—not only for the patients，but also for yourself.
【小题1】Why was Coben surprised at the results of the study？
| A．The study was not expensive as expected. |
| B．Arts acted as a treatment tool in hospitals. |
| C．People's health in the arts group improved greatly. |
| D．The seniors themselves noticed health improvements. |
| A．Doubtful. | B．Positive. |
| C．Negative. | D．Worried. |
“She uses song to help patients who suffer from a variety of problems.”
| A．（1） | B．（2） |
| C．（3） | D．（4） |
| A．How to Avoid Getting Dementia. |
| B．How Seniors Live a Healthy Life. |
| C．How to Keep Our Brains Healthy. |
| D．How Singing Improves Your Health. |
Doctors say anger can be an extremely damaging emotion, unless you learn how to deal with it. They warn that anger can lead to heart disease, stomach problems, headaches, emotional problems and possibly cancer.
For years many doctors thought that repressing anger was more dangerous to a person’s health than expressing it. They said that when a person is angry, the brain releases the same hormones (荷尔蒙). They speed the heart rate, raise blood pressure, or sugar into the blood, etc.
Some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger violently may be more likely to develop heart disease, and they believe that those who keep anger inside may face a greater danger of high blood pressure.
Doctors say that a good way to deal with anger is to find humor in the situation that has made you angry.
| A．In general the person feels excited and ready to act. |
| B．They say that laughter is much healthier than anger. |
| C．Expressing anger violently is more harmful than repressing it. |
| D．Anger may cause you a cancer. |
| E．Do not express your anger while angry. |
| F．Anger is a normal emotion that we all feel from time to time. |
| G．Doctors say the solution is learning how to deal with anger. |
“We don’t know what that means to long-term health and certain diseases yet,” says Heather Stapleton, one of the study’s authors. But she notes that her team’s findings also raise a question of whether pollutants in dust might play some role in the growing, global problem of obesity (肥胖).
Stapleton and her colleagues collected dust from homes and offices. Studies found that some materials in the dust could turn on a protein (蛋白质) called PPAR-gamma 1. It’s found in many human tissues. Turning this protein on can cause fat cells to grow. Researchers think this protein may be involved in obesity. But a second study now finds evidence that certain fats are mostly to blame. Cooking oils may send out some of these fats into the air, where they eventually find their way into house dust. Or, the authors say, the fats might enter house dust as part of the hair or skin cells shed (脱落) by people or pets.
“While the findings are amazing,” says Mitchell Lazar, another study author, “these findings need to be taken as very limited.” Indeed, he adds several cautions about how the findings should be understood. “For one thing, people eat these fats in foods all of the time. That is likely to be a lot more than would be consumed from indoor dust,” he said.
【小题1】What do we know about PPAR-gamma 1? _____
| A．It comes from dust. |
| B．It leads to weight gain. |
| C．It can help get rid of dust. |
| D．It only appears in human bodies. |
| A．Can house dust make us fat? |
| B．Why is it important to clean? |
| C．Anything to do to deal with dust? |
| D．What is the best way to lose weight? |
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