A
Finding out what kind and how much physical activity you need
How do I do it?
It’s your choice. Pick an activity that’s easy to fit into your life. Do at least 10 minutes of physical activity at a time. Choose aerobic activities that work for you. These make your heart beat faster and can make your heart, lungs, and blood vessels fitter. Also, do strengthening activities which make your muscles do more work than usual.
Why should I be physically active?
Physical activity can make you feel stronger and more alive. It is a fun way to be with your family or friends. It also helps you improve your health.
How many times a week should I be physically active?
It is up to you, but it is better to spread your activity throughout the week and to be active at least 3 days a week.
How do I build up more physical activity?
Do a little more each time. Once you feel comfortable, do it more often. Then you can trade activities at a moderate level for vigorous ones that take more effort. You can do moderate and vigorous activities in the same week.
How can I tell an activity at a moderate level from a vigorous one?
Vigorous activities take more effort than moderate ones. Here are just a few moderate and vigorous aerobic physical activities. Do these for 10 minutes or more at a time.
21. What is the main purpose of this text?
A. To give instruction in physics study.
B. To give advice on being physically active.
C. To urge people to abandon bad living habits.
D. To encourage students to be devoted to sports.
22. Which of the following is NOT mentioned as the advantage of being physically active?
A. Making you earn more.
B. Making your body healthier.
C. Making you feel more energetic.
D. Making your muscles work more effectively.
23. What would the author discuss in the paragraph that follows?
A. Kinds of moderate and vigorous activities.
B. Ways to get more information about physical activity.
C. The chart tells the activities that are important for you to do.
D. Aerobic activities and muscle strengthening activities.
【答案】21. B 22. A 23. A
【解析】
本文是一篇说明文。本文为我们提供一些健身的建议。通过此文你可以选择出你所喜欢的体育活动，并且知道一周你需要多少体育锻炼。
【21题详解】
主旨大意题。根据文章的标题Finding out what kind and how much physical activity you need可知，本文的写作目的是提供健身的建议。故选B。
【22题详解】
细节理解题。根据文章小标题How do I do it?中的Also, do strengthening activities which make your muscles do more work than usual.可知，身体健康活跃的优点是使你的身体更健康，让你充满活力，使你的肌肉更发达。故选A。
【23题详解】
推理判断题。根据文章最后一段Here are just a few moderate and vigorous aerobic physical activities.可知，下面一段主要讲述几种温和的有氧运动。故选A。
