第一节（共11小题；每小题2分，满分22分）

阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳答案，并在答题卡上将该项涂黑。

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 l>e 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.

1. 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.

2. Which of the following is NOT mentioned as the advantage of being physically active?

A. Making you earn more.