1 . Running is often tiring and a lot of hard work, but nothing beats the feeling you get after finishing a long workout around the track.
But while it’s long been believed that endorphins (内啡肽) —chemicals in the body that cause happiness—are behind the so-called “runner’s high”, a study suggested that there may be more to this phenomenon than we previously knew.
According to a recent study published by a group of scientists from several German universities, a group of chemicals called endocannabinoids (内源性大麻素) may actually be responsible for this familiar great feeling.
To test this theory, the scientists turned to mice. Both mice and humans release high levels of endorphins and endocannabinoids after exercise. After exercising on running wheels, the mice seemed happy and relaxed and displayed no signs of anxiety. But after being given a drug to block their endorphins, the mice’s behavior didn’t seem to change. However, when their endocannabinoids were blocked with a different drug, their runners’ high symptoms seemed to fade.
“The long-held notion of endorphins being responsible for the runner’s high is false. Endorphins are effective pain relievers, but only when it comes to the pain in your body and muscles you feel after working out,” Patrick Lucas Austin wrote on science blog Lifchacker.
Similar studies are yet to be carried out on humans, but it’s already known that exercise is a highly effective way to get rid of stress or anxiety. The UK’s National Health Service even prescribes (开药 方) exercise to patients who are suffering from depression. “Being depressed can leave you feeling low in energy, which might put you off being more active. Regular exercise can improve your mood if you have depression, and its especially useful for people with mild to moderate (中等的) depression,” it wrote on its website.
It seems like nothing can beat that feeling we get after a good workout, even if we don’t fully understand where it comes from. At least if we’re feeling down, we know that all we have to do is to put on our running shoes.
1. What did scientists from German universities recently discover?| A．Working out is a highly effective way to treat depression. |
| B．The runner’s high could be caused by endocannabinoids. |
| C．Endorphins may contribute to one’s high spirits after running. |
| D．The level of endorphins and endocannabinoids could affect one’s mood. |
| A．To find what reduces the runner’s high symptoms. |
| B．To see the specific symptoms of the runner’s high. |
| C．To identify what is responsible for the runner’s high. |
| D．To test what influences the level of endocannabinoids released. |
| A．Effect. | B．Goal. | C．Opinion. | D．Question |
| A．They can help ease depression symptoms. |
| B．They are the best way to treat depression. |
| C．They only work for those with serious depression. |
| D．They can help people completely recover from depression. |
2 . Why Is Exercise Important to Teenagers and How to Get Started?
Teens get involved in a lot of things in high school. Some are involved in clubs and others are part of the band. There are many reasons why sports are great for teens and here’s how they can get started.
One of the biggest benefits for teens to be involved in sports is that it keeps them active. Some teens would be content to play video games or watch television all the time they’re at home. If a teen spends all their waking time being inactive they could gain weight and become unhealthy.
Be sure your child knows to warm up properly before playing any sport. Warming up before any physical activity will help your child avoid injury.
Encourage your teens to try out for one high school sport. Perhaps they’re not comfortable with football, but that doesn’t mean they wouldn’t excel in swimming or tennis. They may also enjoy playing baseball or soccer. Girls may enjoy basketball, swimming.
Many sports team will require that students try out before being able to join. Try-outs may include showing how active your teen is, running, jumping or if they are quick enough. They want to ensure your teen has at least the minimum skills required for the sport they’re trying out for.
Being a part of a sports team can also help your teen make friends.
| A．Athletes almost become like a second family. |
| B．This is a good practice whether they’re practicing with the team or exercising on their own. |
| C．Do everything you can to encourage your teen. |
| D．Being a part of a sports team will help them burn calories so they will remain healthier. |
| E．Your teens may not feel that they’re good enough to make their high school sports team. |
| F．High school coaches are going to do their best to keep their team members healthy. |
3 . Have you tried to run or walk for exercise and then given up? If you answered yes, you should try a new kind of exercise: aquatic (水中的) exercise. Aquatic exercise is like exercise on land, but you do it in a swimming pool. More and more people are trying aquatic exercise now.
Aquatic exercise feels easier than exercising on land. Why? You weigh about 90% less in the pool. It is better for your knees than running or walking. Water is about 1,000 times thicker and heavier than air. To move through the water, your body has to work four times as hard. As a result, you can burn more calories (卡路里).
In fact, most people say they feel more relaxed in the water. They stop thinking about the things that make them worried. They feel in control of their bodies. The cool, quiet environment makes them feel good.
But what if you are afraid of the water? No problem! There is nothing to worry about. Aquatic exercise is safe and easy to learn. It doesn’t require any special skills. You don’t even need to know how to swim. Aquatic exercise is for everyone.
1. What is Paragraph 2 mainly about?| A．Difference between air and water. |
| B．Weight change of one’s body. |
| C．The advantages of aquatic exercise. |
| D．The ways to do aquatic exercise. |
| A．Relaxing. | B．Worrying. |
| C．Challenging. | D．Boring. |
| A．done in groups | B．fit for everyone |
| C．difficult to learn | D．done with special skills |
| A．Culture. | B．Health. |
| C．Nature. | D．Travel. |
4 . As we age, even if we’re healthy, the heart just isn’t as efficient in processing oxygen as it used to be. In most people the first signs show up in their 50s or early 60s. And among people who don’t exercise, the changes can start even sooner.
“Think of a rubber band. In the beginning, it is flexible, but put it in a drawer for 20 years and it will become dry and easily broken,” says Dr. Ben Levine, a heart specialist at the University of Texas. That’s what happens to the heart. Fortunately for those in midlife, Levine is finding that even if you haven’t been an enthusiastic exerciser, getting in shape now may help improve your aging heart.
Levine and his research team selected volunteers aged between 45 and 64 who did not exercise much but were otherwise healthy. Participants were randomly divided into two groups. The first group participated in a program of nonaerobic (无氧) exercise—balance training and weight training—three times a week. The second group did high-intensity aerobic exercise under the guidance of a trainer for four or more days a week. After two years, the second group saw remarkable improvements in heart health.
“We took these 50-year-old hearts and turned the clock back to 30-or 35-year-old hearts,” says Levine. “And the reason they got so much stronger and fitter was that their hearts could now fill a lot better and pump (泵送) a lot more blood during exercise.” But the hearts of those who participated in less intense exercise didn’t change, he says.
“The sweet spot in life to start exercising, if you haven’t already, is in late middle age when the heart still has flexibility,” Levine says. “We put healthy 70-year-olds through a yearlong exercise training program, and nothing happened to them at all.”
Dr. Nieca Goldberg, a spokeswoman for the American Heart Association, says Levine’s findings are a great start. But the study was small and needs to be repeated with far larger groups of people to determine exactly which aspects of an exercise routine make the biggest difference.
1. What does Levine want to explain by mentioning the rubber band?| A．The right way of exercising. | B．The causes of a heart attack. |
| C．The difficulty of keeping fit. | D．The aging process of the heart. |
| A．Diet plan. | B．Professional background. |
| C．Exercise type. | D．Previous physical condition. |
| A．Middle-aged hearts get younger with aerobic exercise. |
| B．High-intensity exercise is more suitable for the young. |
| C．It is never too late for people to start taking exercise. |
| D．The more exercise we do, the stronger our hearts get. |
| A．Making use of the findings. | B．Interviewing the study participants. |
| C．Conducting further research. | D．Clarifying the purpose of the study. |
5 . Becoming a real runner
I would never use the word “athletic” to describe myself. To me, athletes are people who really enjoy working out. I remember crying in middle school when I had to run a mile during gym class. I huffed and puffed as I jogged. As I grew up, I would go to the gym, but I never enjoyed working out. That, I thought, was for real runners.
In June 2017, my friend sent me an email that would forever change my attitude towards running. He was training for a 200-mile relay (接力赛) and wanted me to be on his team. I would run three legs between four and six miles each over the course of two days. Figuring that I would never again have the chance to work with some top runners, I immediately agreed, and started running outside to prepare.
That first run was hard. I purposefully avoided Central Park in order to stay away from real runners. After a few blocks, I was already winded, and ran the rest of the way home. I called my mom, choked up, to say I had no hope at all of running this relay. But she encouraged me to keep at it, so I didn't quit. I went from running four miles a week to eight within one month before my advanced training began.
I was frightened going into the first training session with the team as everyone else was super “athletic”. We ran for five miles, and I was significantly slower. However, my teammates were so supportive that I felt the runner’s high, which I had never believed existed.
One day, about two weeks into training, my ankle gave out while I was running in Central Park. I was diagnosed with a stress fracture (应力性骨折). The doctor told me to stop running for two months. It took me a while to face the fact that I was out of the race. My doctor told me that he too had once been struck down with a stress fracture, and the following year, he beat his best running time in a half-marathon. That brought me hope.
I made it through the next two months by picturing myself running again. Just yesterday, for the first time since that fateful day, I took my outdoor run with my physical therapist. I mentioned that I might run a half-marathon the next year. Now I wake up excited for the days I get to run. Maybe I am a “real runner” after all.
1. According to the article, when did the author start to feel passion for running?| A．After she got into the habit of working out. |
| B．After she got the courage to run outdoors on her own. |
| C．After she ran with some top runners and got their encouragement. |
| D．After she broke her ankle in training and stayed in bed for two months. |
| A．helpful advice. |
| B．immediate treatment. |
| C．experience in the marathon. |
| D．personal experience with an injury. |
| A．She didn’t take the relay seriously. |
| B．She had a strict and overprotective mother. |
| C．She felt disappointed about withdrawing from the race. |
| D．She would have expected to run a half-marathon if she had won the race. |
| A．urge readers to exercise regularly. |
| B．share with readers the fun of running. |
| C．warn readers to be careful about running. |
| D．encourage readers to pursue their hobbies. |
Adolescents Worldwide Not Sufficiently Physically Active
New WHO-led study says majority of adolescents worldwide are not sufficiently physically active, putting their current and future health at risk.
The health benefits of a physically active lifestyle during adolescence include improved heart and lungs fitness, bone health and positive effects on weight. There is also growing evidence that physical activity has a positive impact on cognitive development and socializing.
To achieve these benefits, the WHO recommends for adolescents to do moderate or vigorous physical activity for an hour or more each day. The authors estimated 80 percent of teems do not meet this recommendation by analysing data collected through school-based surveys on physical activity levels.
| A．Current evidence suggests that many of these benefits continue into adulthood. |
| B．To increase physical activity for adolescents, the authors need to identify the many causes and inequities. |
| C．The authors say that levels of insufficient physical activity in adolescents continue to be extremely high. |
| D．To improve levels of physical activity among adolescents, the study provides some recommendation as follows. |
| E．The authors note that adolescents' participation in physical activity will continue into adulthood. |
| F．The study highlights that young people have the right to play and should be provided with the opportunities to realize their right to physical and mental health and well-being. |
7 . If you think that running marathons will help you live a long and healthy life, new research may come as a shock. According to a recent scientific study, people who do a very strenuous workout are as likely to die as people who do no exercise at all.
Scientists in Denmark have been studying over 1,000 joggers and non-joggers for 12 years. The death rates from the sample group indicate that people who jog at a moderate pace two or three times a week for less than two and a half hours in total are least likely to die. The best speed to jog at was found to be about 5 miles per hour. The research suggests that people who jog more than three times a week or at higher speeds of over 7 mph die at the same rate as non-joggers. The scientists think that this is because strenuous exercise causes structural changes to the heart and arteries(动脉). Over time, this can cause serious injuries.
Peter Schnohr, a researcher in Copenhagen, said, “If your goal is to decrease risk of death and improve life expectancy, jogging a few times a week at a moderate pace is a good strategy. Anything more is just unnecessary, and it may be harmful.”
The implications of this are that moderate forms of exercise such as tai chi, yoga and brisk walking may be better for us than “iron man” events, triathlons and long-distance running and cycling. According to Jacob Louis Marott, another researcher involved in the study， “You don't actually have to do that much to have a good impact on your health. And perhaps you shouldn't actually do too much.”
1. The underlined word “strenuous” in Paragraph 1 is closest in meaning to “________”．| A．hard | B．regular |
| C．practical | D．little |
| A．suggest giving up jogging | B．show risks of doing sports |
| C．provide supportive evidence | D．introduce the research process |
| A．It may injure the heart and arteries. | B．It can make the body tired out. |
| C．It will bring much pressure. | D．It consumes too much energy. |
| A．Jogging is the best exercise. |
| B．More exercise means a healthier life. |
| C．Marathons runners are least likely to die. |
| D．Proper exercise contributes to good health. |
