新视野大学英语视听说教程3课后答案

Unit1： 1.What factors may weaken one's memory? It is often reported that long-term poor nutrition may affect the functioning of the brain, thus damaging both the long-term and short-term memory. Also harmful to one's memory is lack of water. Elderly people need plenty of water to guarantee their memory works. A third factor is lack of sleep. Without enough sleep, one may feel tired and have difficulty concentrating, not to mention learning things by heart. 2. Can you describe some possible adva