【文章內(nèi)容簡介】 ing. “If they often lose sleep,” Dr. Dowdell says, “teens may bee angry, or depressed. A lack of sleep can lead to weight gain and even obesity because many people turn to junk food for quick energy when they are tired.” Some experts are worried about how texting is affecting teenagers’ lives. One concern is that students might not learn correct grammar and spelling if most of the writing they do is made up of text messages. Some people also worry that teens don’t spend enough time talking with others facetoface, which could be hurting their relationships with friends and family. Moreover, all that texting takes away hours that could be spent studying, exercising, taking up a hobby, or just relaxing. According to Dr. Dowdell, teens need to learn that they can and should turn off their phones sometimes. She had Kenny and Frances do an experiment. These were the rules: No phone for 48 hours. No puter or Inter either, unless it was for schoolwork. After 48 phonefree hours, Kenny and Frances were interviewed. “Wow, it was pure torture (折磨 ),” Kenny joked. Kenny missed his friends, and he was sad at times. But he also felt relief from the constant texting. He spent time reading books and meditation talking with his family, wh ich he really enjoyed. Frances had an even happier result. “I loved it!” she said, “I was going to the gym and hanging out with friends and playing basketball. I had a wonderful experience.” Frances decided to continue the experiment for a while. “I think I’ll be so much smarter and healthier,” she explained, “everybody in the world should try it.” 51. If teens keep waking up to text while sleeping, they may ______. A. get overweight B. bee happier C. disturb their parents D. feel more relaxed 52. What is Paragraph 4 mainly about? A. Mistakes in teens’ text writing. B. Time wasted on meaningless texting. C. Worries about how texting affects teens. D. Encouragement to teens’ talking facetoface. 53. The writer mentions the experiment on Frances and Kenny to ______. A. advise people what to do without phones B. show teens can live well without phones C. explain phones are important in teens’ lives D. introduce how they make good use of phones D Mindfulness Matters In recent years, some schools have begun to introduce meditation, or mindfulness training, into their classrooms. During mindfulness training, students may be asked to sit quietly and observe their own thoughts and feelings to avoid being controlled by them. Mindfulness training can help students overe anxiety ( 焦慮 ), control their behavior, and improve their ability to pay attention in class. Students are expected to learn how to meditate in order to reduce stress and do better in their schoolwork. Among schools that already teach meditation, the results have been positive. In one study, teachers reported that after five weeks of mindfulness practice, their students were more focused. They also participated more fully in class. A middle school in San Francisco reported that a student meditation program led to higher attendance rates and better grades. Another study suggested that meditation helped students perform better on tests by improving their working memory and reducing their anxiety. Many supporters believe that meditation training programs can also help students overe stress. For examp le, Headstand is a mindfulness education program designed to help students overe anxiety. A study concluded that niyeight percent of participating students felt less stressed after they pleted the Headstand program. In another study, researchers in New Haven, Connecticut, followed students who participated in meditation and yoga classes three times a week. They found that after each class, participants had lower levels of cortisol, a stress hormone (激素 ), in their bodies. Despite the positive results seen so far, critics also point out that much of the current research is not rigorous ( 嚴謹?shù)?) enough. Associate Professor Tamar Mendelson agrees that research on meditation in children is still in its early stages. However, even she insists that she has seen the positive impact of meditation on children. Others express worries that meditation is not a valuable use of class time. But many disagree. Denise Pope, a professor from the Stanford University, says, “This is something teachers can do immediately. You get a lot of bang for your buck and anyone who is against it isn’t thinking clearly.” Indeed, additional studies will surely strengthen our understanding of the benefits of mindfulness. Although still in its early stages, research shows that meditation can help students learn to deal with anxiety and stress. As an added bonus, students of mindfulness training also report better concentration and gains in their academic performances. Therefore, meditation should be a part of every student’s school day. Participating in “stillness” can be just as productive as other schoolrelated activities. 54. Why do some schools introduce mindfulness training into classes? A. To control students’ working memory. B. To reduce students’ stress and anxiety. C. To increase students’ attendance rates. D. To research students’ thoughts and feelings. 55. What can we learn from the pass age? A. Mindfulness training is not a valuable use of class time at school. B. Mindfulness training is more productive than other school activities. C. Students felt more stressful after joining yoga classes three times a week. D. Students paid closer attention in class after weeks of mindfulness practice. 56. The words “a lot of bang for your buck” in Paragraph 4 probably mean “______”. A. challenges B. plaints C. advantages D. influences 57. The writer probably agrees that ______. A. further studies will prove the benefits of mindfulness trainin