题目

Easy Ways to Keep Your Brain Sharp Everyone is forgetful, but as we age, we start to feel like our brains are slowing down a bit—and that can be a very annoying thing.  71     Read on for some techniques worth trying. 1.  72      People who regularly made plans and looked forward to upcoming events had a 50 percent reduced chance of Alzheimer's disease (早老性痴呆症), according to a recent study.    73    Something as simple as setting a goal to havea weekly coffee date with a friend will do. There's evidence that people who have a purpose in life or who are worki数轴上离开原点距离小于2的整数点的个数为x；不大于2的整数点的个数为y，等于2的整数点的个数为z，求x＋y＋z的值．