1 . 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.

2. In which aspect were the two groups different in terms of research design?

A．Diet plan.	B．Professional background.
C．Exercise type.	D．Previous physical condition.

3. What does Levine’s research find?

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.

4. What does Dr. Nieca Goldberg suggest?

A．Making use of the findings.	B．Interviewing the study participants.
C．Conducting further research.	D．Clarifying the purpose of the study.

5 . The Importance of Getting Kids to Be Active

Everyone knows that kids should be physically active and need to exercise regularly to be physically fit.     1    , regular physical activity is considered by most experts to be an important part of a healthy lifestyle. However, that doesn’t mean every child needs to spend four or five hours a day exercising.

How Much Exercise Do Kids Need?

It is recommended that kids should be physically active for at least 60 minutes per day.     2    . For example, if your eight-year-old played soccer for 20 minutes during PE at school and then played basketball with his friends for 40 minutes after school, he would meet the recommendation of 60 minutes of physical activity for that day.

Exercise and Calories

    3    . It can help them build self-respect, sleep better, have more energy, and reduce depression. And as most people know, along with a healthy diet, regular exercise is the best way to lose weight and prevent childhood obesity (肥胖). Since your child is not likely to get his exercise using exercise equipment, it can be hard to always tell how many calories he is burning while exercising.     4    , as long as your child is getting his 60 minutes or more of physical activity each day and maintaining a healthy diet.

Youth Exercise and Fitness

Remember that kids, even teens, don’t usually stick with exercise programs.     5    . Instead, kids do better with lifestyle exercise programs, such as active free play and organized team sports.

A．Fortunately, it doesn’t matter

B．Regular exercise is good for kids

C．So they will be able to burn even more calories

D．That’s why you don’t see many kids in health clubs

E．Whether they are overweight or at a healthy weight

F．If your child is very active and is still gaining weight

G．But that doesn’t have to be 60 minutes of continuous activity

7 . Rollerblading is an excellent sport that just about anyone can enjoy. After you have mastered the basics of rollerblading, you can begin to master the sport. There are a variety of different methods and styles that you can try.     1    . However, some athletes prefer to perfect their sport and compete in their chosen sport. The sport of rollerblading has many forms and styles that allow competition.

Some types of rollerblading, including free skating and aggressive skating, have a heavy emphasis on tricks. Free skating is a type of rollerblading that is primarily about getting from start to finish as fast as possible.     2    .

Some inline skaters prefer to go the way of inline speed skating.     3    . Unlike free skating and aggressive skating inline speed skating does not involve tricks or obstacles. The competitions take place on roller skating rinks, or on outdoor rinks. Inline speed skating competitions include a variety of different events and formats that range from sprints to longer distance relay competitions. Many athletes who choose inline speed skating can also ice speed skate as the seasons change.

    4    . In this sport teams compete against each other for the puck, using sticks to pass and direct the puck into the goal. Roller hockey is played essentially the same way as ice hockey, but the equipment has been redesigned in order to adapt to the non-ice conditions.

Each of these sports requires different skills and is comprised of a different group of people.     5    . Whichever sport a beginning inline skater may choose if they want to develop their skills as a skater, hey will have fun mastering one of the excellent sports.

A．Inline speed skating is all about racing

B．Many people enjoy rollerblading just for the simple pleasure of exercise

C．In addition to emphasizing speed, free skating often includes different tricks

D．Free skating is set in an urban setting and participants must travel through streets

E．Roller hockey is of course another, yet completely different form of rollerblading

F．Those inline skaters can also try sports like inline figure skating and speed skating

G．Each sport requires skill, and experience, as well as having different equipment requirements

8 . Although a gym membership can be nice, you don't have to have one to get into great shape! All you need is a little bit of time and space at home for yourself.     1    

Spend 5 to 10 minutes warming up before every workout.     2     Try jumping jacks, leg or arm circles, or even dancing. Just get your blood pumping. Do a progressive aerobic activity that uses the same muscles you want to work out. For instance, slowly jog if you are going for a longer run.

    3     Strength training, also called resistance training, makes you stronger and builds endurance. Try to do exercises that work a lot of muscles and add weight to increase your resistance. This helps you do a harder workout every time you exercise.

    4    You might be eager to just stop your workout when you've finished your last set of activity, but take a few minutes to do low-intensity exercises that lower your heartrate. You might drop your run into a walk or slow down your cycling, for instance.

Set achievable goals that you can break into smaller tasks. It's one thing to say you want to get fit, but that means something different for everyone.     5     It should be specific, realistic, and meaningful. Then, break down each goal into small, actionable steps so it feels like you're making progress regularly.

A．Not sure what to do?

B．Want to build muscle without buying equipment?

C．Do strength training twice a week to build muscle.

D．If you're struggling to fit in workout time, don't worry.

E．Spend five to ten minutes cooling down after each workout.

F．Figure out what you plan to achieve and make that your goal.

G．But before everything, you need to create an at-home fitness routine.

10 . The benefits of regular exercise are well documented but there’s a new bonus to add to the ever-growing list. New researchers found that middle-aged women who were physically fit could be nearly 90 percent less likely to develop dementia in later life, and as they did, it came on a decade later than less sporty women.

Lead researcher Dr. Helena Horder, of the University of Gothenburg in Sweden, said : "These findings are exciting because it’s possible that improving people's cardiovascular （心血管的）fitness in middle age could delay or even prevent them from developing dementia. "

For the study, 191 women with an average age of 50 took a bicycle exercise test until they were exhausted to measure their peak （最大值的） cardiovascular capacity. The average peak workload was measured at 103 watts.

A total of 40 women met the criteria for a high fitness level, or 120 watts or higher. A total of 92 women were in the medium fitness category; and 59 women were in the low fitness category, defined as a peak workload of 80 watts or less, or having their exercise tests stopped because of high blood pressure, chest pain or other cardiovascular problems.

These women were then tested for dementia six times over the following four decades. During that time, 44 of the women developed dementia. Five percent of the highly fit women developed dementia, compared to 25 percent of the women with medium fitness and 32 percent of the women with low fitness.

"However, this study does not show cause and effect between cardiovascular fitness and dementia, it only shows an association. More research is needed to see if improved fitness could have a positive effect on the risk of dementia and also to look at when during a lifetime a high fitness level is most important. " She also admitted that a relatively small number of women were studied, all of whom were form Sweden, so the results might not be applicable to other groups.

1. What is on the ever-growing list mentioned in the first paragraph?

A．Positive effects of doing exercises.

B．Exercises suitable for the middle-aged.

C．Experimental studies on diseases.

D．Advantages of sporty woman over man

2. Why did the researchers ask the women to do bicycle exercise?

A．To predict their maximum heart rate.

B．To assess their cardiovascular capacity

C．To change their habits of working out

D．To detect their potential health problems

3. What do we know about Dr Horder's study?

A．It aimed to find a cure for dementia.

B．Data collection was a lengthy process.

C．Some participants withdrew from it.

D．The results were far from satisfactory.

4. Which of the following is the best title for the text?

A．More Women Are Exercising to Prevent Dementia

B．Middle-Aged Women Need to Do More Exercise

C．Fit Women Are Less Likely to Develop Dementia

D．Biking Improves Women's Cardiovascular Fitness