Câu hỏi 789371:
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Yesterday, when I was riding along a busy street, I saw an accident. A woman was knocked down when she crossed the street at a zebra crossing. Many people stopped to offered their help. A policeman arrived and asked the young man to telephone for an ambulance. While waiting for an ambulance,the policeman and some people tried to stop bleeding. They used a handkerchief to cover the wound, then ut pressure on it and held it tight. They tried to talk to her in order to keep her awake. After about ten minutes,the ambulance arrived and the woman was taken to the hospital
Why was the woman knocked down?