题目要求：写一篇 100 ～ 120 字的短文。说明步行有益健康。（内容自选）
范文：
Walking i good to people' health
A everyone know， either fat walk or low walk doe good to the mucle （肌肉） and lung of human. So people walk to build up their body， or to loe weight. But only ome of them know that taking a walk every day i alo good for protecting man' heart. Heart attack ha become the firt dieae in the world becaue mot people uffer from it.
Taking a walk can improve the blood upply to our heart. If you try to walk a often a poible， you'll have a healthier heart.