People who smoke could lose around one third of their everyday memory, researchers say.

    A study by a team at the University of Northumbria has shown that smokers lose more of their memory when compared to non-smokers. And the research also found that those who kicked the habit saw their ability to recollect information restored to almost the same level as non-smokers.

The study involved more than seventy 18-to 25-year-old volunteers and included a tour of the university's campus. Those who took part were asked to recall(回忆；回想)small details, such as music acts listed to play at the students' union and tasks completed at various points—known as a real-world memory test.

    Smokers performed badly, remembering just 59 percent of tasks. But those who had given up smoking remembered 74 percent and those who had never smoked recalled 81 percent of tasks.

    Dr. Tom Heffernan, who leads Northumbria University's Collaboration for Drug and Alcohol Research Group, said the findings would be useful in anti-smoking campaigns. He said, “Given that there are up to 10 million smokers in the UK and as many as 45 million in America, it's important to understand the effects that smoking has on everyday cognitive function.”

    This is the first time that a study has set out to examine whether giving up smoking has an effect on memory. We already know that giving up smoking has huge health benefits to the body, but this study also shows how stopping smoking can bring a series of benefits to cognitive function. The research will now investigate the effects of second-hand smoking on memory, while Dr. Heffernan will look into third-hand smoking, such as toxins (毒素) left on curtains and furniture.

Bicycle Safety

    Operation Always ride your bike in a safe, controlled manner on campus(校园). Obey rules and regulations. Watch out for walkers and other bicyclists, and always use your lights in dark conditions.

Theft Prevention Always securely lock your bicycle to a bicycle rack—even if you are only away for a minute. Register your bike with the University Department of Public Safety. It's fast, easy, and free. Registration permanently records your serial number, which is useful in the possible recovery of the bike stolen.

Equipment

    Brakes  Make sure that they are in good working order and adjusted properly.

    Helmet  A necessity, make sure your helmet meets current safety standards and fit properly.

Lights Always have a front headlight—visible at least 500 feet in front of the bike. A taillight is a good idea.

Rules of the Road

    Riding on Campus  As a bicycle rider, you have a responsibility to ride only on streets and posted bicycle paths. Riding on sidewalks or other walkways can lead to a fine. The speed limit for bicycles on campus is 15mph, unless otherwise posted. Always give the right of ways to walkers. If you are involved in an accident, you are required to offer appropriate aid, call the Department of Public Safety and remain at the scene until the officer lets you go.

    Bicycle Parking  Only park in areas reserved for bikes. Trees, handrails, hallways, and sign posts are not for bicycle parking, and parking in such posts can result in a fine.

If Things Go Wrong

    If you break the rules, you will be fined. Besides violating rules while riding bicycles on campus, you could be fined for:

No bicycle registration—————————————————$25

Bicycle parking banned————————————————--$30

Blocking path with bicycle ———————————————$40

Violation of bicycle equipment requirement ————————-$35

    Friends play an important role in our lives, and although we can't be more familiar with the fact of friendship, we often don't clearly understand how we make friends, especially with Americans. Here are some pieces of advice on making friends with Americans:

    ⒈Visiting places Americans enjoy: parties, churches, restaurants, parks and sports clubs.

    ⒉Be willing to take the first step. Don't wait for them to get close to you. Americans in China may not know you speak English. They may be uncomfortable if they can't speak your language.

    ⒊Use small talks to open the conversation. Ask them where they're from, why they come to China, etc.. Remember: Be careful not to ask personal questions about age, salary and so on.

    ⒋Show an interest in their culture, their country or their job. Americans like to talk about themselves!

    ⒌Invite them to join you for dinner or just for coffee or tea. Try to set a specific(明确的)time. Americans sometimes make general invitations like “Let's go out for dinner sometime. ” Often this is just a way to be friendly. It is not always a real invitation.

    ⒍Don't expect too much at first. Maybe they're being friendly. But maybe they want to be your good friends. It will take time to tell.

    Grown-ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still swim as well as ever when he gets back in the water. He can get on a bicycle after many years and still ride away. He can play catch and hit a ball as well as his son. A mother who has not thought about the words for remember the story of Cinderella or Goldilocks and the Three Bears.

    One explanation is the law of overlearning, which can be stated as follows: Once we have learned something, additional learning trials increase the length of time we will remember it.

    In childhood we usually continue to practice such skills as swimming, bicycle riding, and playing baseball long after we have learned them. We continue to listen to and remind ourselves of words such as "Twinkle, twinkle, little star" and childhood tales such as Cinderella and Goldilocks. We not only learn but overlearn.

    The multiplication tables(乘法口诀表)are an exception to the general rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood.

    The law of overlearning explains why cramming (突击学习)for an examination, though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little overlearning, on the other hand, is really necessary for one's future development.

    Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity (湿度).

    In very cold climates, there is a constant danger of developing hypothermia, which is a life-threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0℃. However, differences in persons and even the time of day can cause it to be as much as 6℃ higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4℃. Below 29.4℃, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6℃. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7℃.

    In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life-threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7℃. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.

When {#blank#}1{#/blank#}(meet) people at the airport, most people smile and shake hands with people they meet. We know that a smile is {#blank#}2{#/blank#}(usual) a sign that people feel friendly and happy, but what if we don't know {#blank#}3{#/blank#} the new person is? What if we are not introduced by a friend? What if we are meeting a stranger in {#blank#}4{#/blank#} unfamiliar place? Sometimes people are {#blank#}5{#/blank#}(danger) and humans have to find ways to protect {#blank#}6{#/blank#}(them). We have to make sure we can trust people we do not know, and we have to show that we are not aggressive. Showing our hands means that we are not armed. In many {#blank#}7{#/blank#}(culture) today, the Western custom of shaking hands {#blank#}8{#/blank#}(use). We use our right hand, {#blank#}9{#/blank#} is usually stronger than the left one. If we are using our hand this way, it means that we cannot be holding a knife {#blank#}10{#/blank#} a gun. It shows that we trust the other person, and that the other person can trust us.