Recently a study, led by Pedro Hallal of the Federal University of Pelotas, suggests that nearly a third of adults,31%, are not getting enough exercise. That rates of exercise have declined is hardly a new discovery. Since the beginning of the industrial revolution, technology and economic growth have helped to create a world in which taking exercise is more and more an option rather than a necessity. But only recently has enough good data been collected from enough places to carry out the sort of analysis Dr Hallal and his colleagues have engaged in.

There are common themes in different places. Unsurprisingly, people in rich countries are less active than those in poor ones, and old people are less active than young ones. Less obviously, women tend to exercise less than men-34% are inactive, compared with 28% of men. But there are exceptions. The women of Croatia, Finland, Iraq and Luxembourg, for example, exercise more than their male countrymen.

Malta wins the race for the most slothful country, with 72%of adults getting too little exercise，and Swaziland and Saudi Arabia are in close behind，with 69%.In Bangladesh，just 5%of adults fail to exercise enough. Surprisingly，six in ten Americans are active enough according to Dr Hallal's study，compared with fewer than four in ten British men.

These high rates of inactivity are worrying. Human beings seem to have evolved（进化）to benefit from exercise while deliberately avoiding it whenever they can. In a state of nature it would be impossible to live a life that did not provide enough of it. Actually lack of enough activity these days has nearly the same effect on lifespan（寿命）as smoking.

Once a traveler came into a village, 【小题1】（hunger）. The villagers tried to stop the traveler from staying, 【小题2】（fear）he wanted them to give him food. They told him that there's no food anywhere 【小题3】（find）. The traveler gave an 【小题4】（explain）that he didn't need any food and that, 【小题5】 fact, he was planning to make a soup to share with all of them. The villagers watched 【小题6】（strange）as he built a fire and filled a large pot with water. Then he pulled a stone from a bag, dropping the stone into the pot. He tasted the soup and said 【小题7】delicious the stone soup was. As the villagers began to show interest, he said how good the soup 【小题8】（be）with just a little cabbage in it. A villager brought out a cabbage to share. This event repeated 【小题9】（it）until the soup had cabbage, carrots and onions-indeed, a large soup that fed everyone in the village.

Are you like one of the villagers, holding back？If you come forward and share your gifts, you will encourage others to do the same. The reward is 【小题10】 gift that can benefit（使受益）many.

   Good learners can inspire students or anybody to learn well. Here are some characteristics of good learners.

Good learners are curious. They wonder about all sorts of things，often about knowledge beyond their areas of expertise（专长）. 【小题1】 Finding out about something they didn't know satisfies them for the moment，but their curiosity is addictive.

Good learners don't give up easily. A few things may come easily to learners but most knowledge arrivesafter effort. Good learners are willing to put in time. They try to search out new information. They read，analyze，and evaluate（评估）the information they've found. 【小题2】

Good learners know that a lot of learning isn't fun. The journey to understanding generally isn't all that exciting. 【小题3】 Others need boring attention to detail，and still others need periods of intense mental focus. Your back hurts，your arms and legs get tired，and your coffee gets cold.

【小题4】 There's always more to know. Good learners are never satisfied with how much they know about anything. They are surrounded by questions — the ones they still can't answer, or the ones without very good answers. Those questions follow them like day follows night with the answers bringing daylight.

Good learners share what they' ve learned. Good learners are teachers committed to sharing with others what they' ve learned. 【小题5】 Good learners can also explain what they know in ways that make sense to others. They are connected to the knowledge passed on to them and committed to leaving what they' ve learned with others.

Last week, I have the honor of experiencing teaching. Our school asked some volunteer to teach some kids which lived in the countryside.

I treasured this chance so much and joined in the team. When I met those kids, they were so happily to see me and listened to me carefully. Given the warmest welcome by them, I enjoyed being their teacher. However, I tried my best to teach them and play games with them.

Back to school, I missed our students so much. They liked me a lot but some of them even kept in the touch with me. I felt so proud being a teacher. This precious experience helped me make up my mind to realizing my dream.