1 . Playing sports is a lot of fun. Getting hurt is not.    1    

Wear protective equipment.

The equipment you wear depends on the sport you play. Helmets (头盔) are the most common protective equipment. They protect your head while you’re playing football, baseball, softball, and so on.

Warm up.

    2     Doing some stretches (伸展) can get you prepared to hit the field. By warming up, you get yourself ready to play. Practicing a sport helps keep you safe, too.

Know the rules of the games.

Traffic lights help prevent crashes between many cars that run on the road together. This works because drivers know the rules and follow them—at least most of the time.    3     When players know the rules of the game, fewer injuries happen. For example, you know that in soccer you can’t come from behind, crash into a player’s legs, or steal the ball. It’s legal and safer to go after the ball rather than the player.

    4    

This is a really important one. If you love sports, you may want to get back in the games, even after an injury. But playing when you’re hurt is a bad idea.    5    

Now you know how to prevent sports injuries. If you follow these rules, you can stay safer while you are playing sports.

A．Don’t play when you’re injured.

B．Don’t do too much exercise.

C．It’s the same with sports.

D．It can lead to an even worse injury.

E．It’s not a good idea to just go to the field and start playing.

F．You and the other players know what to expect from each other.

G．Take these steps to prevent injuries so you can stay in the game.

4 . Green exercise is a term used to describe any type of physical exercise that takes place in a natural environment rather than in a health club or gym.     1    . Instead, it relies on the use of natural means of taking part in activities that improve strength and endurance with as little reliance on equipment as possible.

    2    . For example, some consider a truly natural exercise experience requires that the individual wear clothing only made from natural fibers. Others consider barefoot running or walking with a big arena to be more desirable than running or walking with shoes.

A slightly different approach to green exercise puts more stress on the fresh air, sunshine and involvement with the natural world, rather than the equipment or clothing used during the exercise.     3    . Similarly, climbing a mountain using standard equipment and protective clothing would also be considered a green exercise.

Many consider green exercise helps to reconnect human beings with the natural world. The interaction with nature helps to lower people's blood pressure, refresh their mind, and actually improve their self-esteem.     4    .

Not everyone believes that the green exercise is more beneficial than working out in a health club or gym.     5    . Meanwhile, the use of fitness devices may result in more challenging workouts which help strengthen the heart and lungs in ways that more simplistic exercise in a natural setting would be difficult to manage.

A．A green gym uses as little equipment as possible

B．Spirits are also believed to be positively affected

C．Opinions on what truly green exercise means differ

D．Green exercise includes a range of activities exposed to nature

E．So riding a bicycle in the forest can be called a type of green exercise

F．It usually doesn't use fitness equipment that is normally found in a gym

G．Some point out that many health clubs are built to make full use of natural light

5 . 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 (慢跑者) and non - joggers for 12 years. The death rates from the sample group indicate that people who jog at a proper 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 effects.

Peter Schnohr, a researcher in Copenhagen, said, “If your goal is to decrease risk of death and improve life expectancy(寿命), jogging a few times a week at a proper pace is a good strategy. Anything more is not just unnecessary, and it may be harmful.”

The implications (暗示) of this are that moderate forms of exercise such as tai chi, yoga and 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. Which of the following words can replace “strenuous” in Paragraph 1?

A．regular

B．hard

C．practical

D．limited

2. Why does the author presents the figures (数字) in Paragraph 2 ?

A．To suggest giving up jogging	B．To show risks of doing sports
C．To provide supportive evidence	D．To introduce the research content

3. According to the scientists, why is too much exercise harmful?

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.

4. What can be the best title of the text?

A．No exercise at all is the best choice.	B．More exercise means a healthier life.
C．Marathons runners are least likely to die.	D．Too strenuous exercise is no better than none