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  3. How much physical activity should teenagers do, and how can they get enough? Many teenagers spend a lot

How much physical activity should teenagers do, and how can they get enough? Many teenagers spend a lot

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问题                How much physical activity should teenagers do,
                     and how can they get enough?
   Many teenagers spend a lot of time being sedentary (sitting or lying down) at school or work during their【C1】______ time. Modern【C2】______ such as smart phones, computers and food delivered to your front door encourage sedentary behavior. But this lack of physical activity can have【C3】______ consequences for your physical and mental health.
   We have all probably been told we have to exercise to stay healthy, but how much physical activity is the right amount for teenagers? And what are the【C4】______?
   All teenagers are【C5】______ to do 60 minutes of physical activity each day. There are numerous benefits of physical activity, including physical (improved fitness and decreased risk of illness), social (having fun with friends) and【C6】______ (helps manage stress and anxiety) benefits.
   You should try to include a combination of【C7】______ activities (such as swimming or walking), strength training (such as sit ups or weight training) and flexibility training (such as yoga or stretching).
   Try to【C8】______ easy, moderate, and harder activities that are both fun and personally challenging. Limiting【C9】______ time and screen time by regularly【C10】______ periods of sedentary behavior is another good idea. For example, standing and moving for a few minutes after every hour of sitting.
   There are 1,440 minutes in every day,【C11】______ being physically active for just 60 minutes is easily achievable.
   Incidental activity【C12】______ to any movement that increases your level of daily activity. These activities don’t happen at the【C13】______, but instead rely on your daily choices.
   For example, office workers are often told to get more activity into their day by doing things such as parking further away from work and walking the rest of the way, and using the【C14】______ instead of the lift.
   Similarly, you could:
   (1) walk or ride to school instead of taking a car or bus;
   (2) walk around the oval as you chat to your friends at lunchtime instead of sitting;
   (3) do something【C15】______ when you meet up with your friends on the weekend, such as swimming at the beach;
   (4) do an (a)【C16】______ lap when you go to the shopping centre and/or, go down every aisle when you go to the supermarket;
   (5) at family gatherings, play games with your younger siblings and cousins rather than playing on your phone;
   (6) take your dog for a walk and a play at the park more often;
   (7) ride an exercise bike or do some stretching while you watch TV.
   Making these simple choices each day can become a habit【C17】______ increases your physical activity and improves your health.【C18】______ activity doesn’t replace planned exercise, but all the activity you do during the day adds up, and these two forms of activity can work together to increase your physical activity level.
   Incidental activity requires no special【C19】______ or preparation. You can just stand up and move at any time you choose. Remember: something is better than【C20】______ and more is better than less.
【C1】
选项 A、free
B、rushed
C、hasty
D、mandatory
答案A
解析 语境推理。根据上下文可知，青少年花费大量空闲时间在学校或工作中久坐(坐或躺)。根据词义辨析，hasty，rushed均含有“匆忙的”的意思，故排除，mandatory意为“强制的，义务的”也不符合题意，排除，故只有A选项符合题意。
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