文章大意：本文是一篇说明文。长跑对初学者来说是一项很棒的运动。本文介绍了长跑的好处以及给跑步新手的建议。
1 . 从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
Long-distance running is a great sport for beginners. It has a lot of benefits. It will help you get fit and prevent diseases.
If you are new to running, here is some advice for you. It is important to warm up and cool down properly before and after running, so you do not hurt yourself.
| A．But you need to find someone to keep running with you. |
| B．It will also hurt you if you don't warm up before running. |
| C．A warm-up gets your blood flowing and prepares your body before you exercise. |
| D．It also strengthens your immune system and reduces the risk of serious health problems. |
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