1 . 下面文章中有3处需要添加小标题。请从以下选项（A、B、C 和D）中选出符合各段意思的小标题，选项中有一项是多余选项。

Benefits of Sport

On-going physical exercise can be hard for teenagers to try. However, it is good for the mind. body and spirit. If you are planning to do exercise regularly, or you’re doing it now, then listen up!

    1    

Clearly, regular exercise will improve your physical health by contributing to the development of your muscles, bones and lungs. It can help improve your body’s immune system, making you better prepared to fight off diseases. Sport also has hidden health benefits such as lowering the chance of cancer later in life.

Sport teaches team work and problem-solving skills. Fighting for a common goal with a group of players and coaches teaches you how to build teamwork and effectively communicate to solve problems. This experience is helpful when you are solving problems at work or at home.

    2    

Watching your hard work pay off and achieving your goals develop self-confidence. Achieving a sport goal encourages you to achieve other goals you set. This is an exciting learning process. Moreover, sport builds character and encourages you to keep a positive attitude to life.

    3    

Exercising is a natural way to relax and let go of stress. You can also make new friends who can be there for you as a support system. When you feel under pressure or stressed, call up a teammate, head to the gym to talk and play it out.

The world of sport is a fairground of exciting opportunities where you can discover who you really are. Time, I think, to lace up your sports shoes and go play.

A. Sport helps you lose weight.
B. Sport benefits physical health.
C. Sport reduces pressure and stress.
D. Sport improves self-confidence.

2 . Training for a marathon requires careful preparation and steady,gradual increases in the length of the runs.    1    ,buy the best-fitting,best-built running shoes you can find.No one can say which brand will work best for you or feel best on your feet,so you have to rely on your experience and on the feel of each pair as you shop.When you have found shoes that seem right,walk in them for a few days to double-check the fit.If they still feel good,you can begin running in them.As always,you should stretch(伸展) at least ten minutes before each run to prevent injuries. 

During the first week,do not think about distance,but run five minutes longer each day.    2    ,it is wise to take a day off to rest.But during the next week,set a goal of at least a mile and a half per run.With each day,increase the distance by a half mile.After two weeks,start timing yourself.    3    .Depending on the kind of race you plan to enter,you can set up a timetable for the remaining weeks before the race.

A．After six days

B．For a good marathon runner

C．Before you begin your training

D．Now you are ready to figure out a goal of improving distance and time