Smartphones have been blamed for everything from taking drivers’attention from driving to keeping people on the sofa scrolling (滚屏) videos. But the smartphone that seems to be everywhere could just easily increase physical activity if it pushes its owner’s buttons in the right way.

New research shows that making social connections (人际关系) through activity-tracking apps gets people to move more. And another study on the “Pokemon Go” phenomenon shows that the smartphone game got players to take thousands more steps than usual. Together, the studies show the potential (潜在性) of smartphones to push a range of people to be more active.

People who linked with friends on the activity-tracking app increase their steps by 400 a day on average, compared with people who made no social connections, according to Tim Althoff and two other computer scientists at Stanford University. Such opinions show the possibilities of smartphones and games to help with one of the most stubborn public health problems — that even people who want to be active have trouble staying active.

An NBA video game, for example, will give players extra powers in the game if they reach a step goal in real life. The app “Zomies, Run!” uses audio stories to push people to run more or run faster.

Still, there is room for growth: Only about 4% of all health apps use “gamification”, such as point- scoring or competition, according to a study published in October in BMJ Open. “Gamification is actually quite closely linked with behavior change techniques,” says Dr. Elizabeth Ann Edwards, the study’s lead author.

Facebook and Twitter are just two of my favorite things. These websites help me keep in touch with my friends and family, find out what 【小题1】 (interest) events are going on and see and share photographs within my social circle. However, the more time I 【小题2】 (spend) online the less sleep I got, and the 【小题3】 (bad) I felt. I was tired and in low spirits, and 【小题4】 (focus) on classroom lectures and activities became 【小题5】 (increasing) difficult.

I began to wonder whether or not there could be a relationship between the hours I spent on the screen and the bad effects it had the next day at school. 【小题6】(answer) my question, I made some research. I surveyed local middle and high school students. Eight hours is 【小题7】 recommended (建议的) amount of sleep for teenagers. From the responses, I found that those who slept for less than eight hours had about three hours of screen time per day, 【小题8】 kids who got more than eight hours of sleep had about two hours of screen time. The kids who slept less were more likely to suffer 【小题9】 stress, sleeplessness and anxiety. They performed poorly in tests and showed more mood 【小题10】 (problem).

   All of my five children played team sports in middle school and high school, and four of them in college. 【小题1】

Teenagers may get into bad habits. 【小题2】 According to a study in Archives of Pediatric & Adolescent Medicine, a survey of more than 14,000 teenagers found that those who had taken part in team sports were less likely to smoke or have unhealthy eating habits.

As children get older, they naturally develop their own lives and there will be fewer ways for parents to be involved (参与). Some teenagers shut their parents out of their room. 【小题3】

Sports build strong and healthy bodies. Children who compete know that they are only at their best if they eat and rest well. 【小题4】 In sports, strength and speed are wanted. Team sports help kids avoid obesity (肥胖) problems even better than activities like running or biking.

【小题5】 The joy of a sports season stays with us long after the season is over. Our children may forget who was in their English class or which math teacher they had in the 10th grade one day. But they will never forget their sports teams.

Today, our class watched a video which used to be in memory of Stephen Hawking. The video recorded what he had said. After watch it, we were asked to share one of our favorite word with others. What impressed me most is “Without imperfection, you or I will not exist.” In the reality, some people always are far from satisfaction with their daily life, such as looks, figures and income, but hope to have a perfect life. Therefore, it’s imperfection which makes us unique. So we should be aware for our disadvantages, accept them and take it easy, making our life more hopefully.

I’m glad to hear that you’re coming to China to visit Tibet in August. ________________________________

Yours sincerely,

Li Hua

With the rapid development of science and technology, online shopping has become popular with a lot of people, especially the youth.