阅读理解。 Summer holidays are coming soon. Are you going to travel? If you plan to take a plane, you will have a healthy trip by following these suggestions (建议). 1. Bring some needed medicines in your carry-on bag. 2. Don't leave your seat during the plane's take offs and landings. 3. To prevent blood clots (血流不畅): ★ 1______ ★ Do leg-stretching (伸) exercises in your seat. ★ Wear comfortable clothes. 4. If you sometimes get airsick: ★ 2______ ★ Keep your seat belt fastened (系好安全带). ★ Don't take small planes. 5. 3______  Don't take wine or alcohol (酒). 6. Use both hands when reaching overhead for something. 4______ A. This will help prevent yourself from getting hurt. B. Better drink water or juice when you feel thirsty. C. Get up and walk around every 60 to 90 minutes. D. Ask for a window seat or a seat over the wing. 5. What's the best title for the passage? A. A Plan for Summer Holidays. B. Suggestions for an Interesting Trip. C. Suggestions for a Healthy Air Trip. D. Problems during an Air Trip.