8．阅读下面的短文，并根据短文内容回答所提问题． Most teens need more than 9hours of sleep each night．But about 1in 4teens has trouble in sleeping．Lack（缺少） of sleep can affect everything from our feelings to how well we focus on tasks like studying．It can also influence sports performance，increase our chances of getting sick，and may be related to weight gain in some people． How can we get the sleep we need？Here are some ideas： Be active during the day．Get at least 60minutes of exercise a day．Physical activity can decrease（减少） stress and help people feel more relaxed．Just don't work too close to bedtime because exercise can wake you up before it slows you down． Say goodnight to electronics．Experts suggest using the bedroom for sleep only．At least shut everything down an hour or more before lights out． Keep a sleep routine（常规）．Going to bed at the same time every night helps the body expect sleep．Creating a set bedtime routine can improve this relaxation effect．Spending time with a pet，writing a diary or doing anything else can relax you． Expect a good night's sleep．Instead of worrying that you won't sleep，remind（提醒） yourself that you can．Say"Tonight，I will sleep well"several times during the day．It can also help to practice breathing exercises or gentle exercises before bed． Everyone has a sleepless night once in a while．But if you regularly have trouble in sleeping and you think it's affecting your mood or performance，talk to your doctor．
46．How many hours of sleep do most teens need each night？More than nine． 47．Can physical activity increase stress or decrease stress？It can decrease stress． 48．If Tom often has trouble sleeping and it affects like performance，what should he do？He should talk to his doctor． 49．Does making the light on help to have a good sleep？No，it doesn't． 50．Write down at least one of your suggestions about getting the sleep we need．Listening to some light music before going to bed helps us to relax．．
18．Google's DeepMind AlphaGo program beat South Korea's Lee Se-dol in the first of a series of games in Seoul． Throughout most of the game Lee seemed to have the upper hand but in the last 20 minutes，AlphaGo took a very important lead．Mr．Lee then made a big mistake，handing victory to his competitor． "I was very surprised because I did not think that I would lose the game，"said Mr Lee．"A mistake I made at the very beginning lasted until the very last．"The Go player，Lee，has won 18world championships （世界锦标赛） since turning professional at the age of 12．He is considered a No.1Go player because he has won lots of competitions and contests over a long，successful career．The 33-year-old is one of the greatest players in modem history of the ancient board game，with 18international titles to his name-the second most in the world． He said AlphaGo's early method was"excellent"and that he was greatly shocked by one unusual move it had made that a human never would have played．Although he failed，he did not regret accepting the challenge．"I had a lot of fun playing Go and I'm looking forward to the fixture games．"he said． The two sides will play a total of five games over the coming days for a prize of about a million US dollars．The last match is to be held on Tuesday in the Four Seasons Hotel in Seoul．UI think AlphaGo is far more creative than we ever imagined．It makes us rethink all the traditional rules and knowledge we learned in Go．"said Lee Hyun-Wook，a professional Go player． Go is an ancient board game which is famous for its difficulty．It is a two-person game and was created in China more than 3，000years ago．The players compete for territory （领地） by placing black and white stones on crossings of a board of 19lines by 19lines．The winner is the player who manages to sealmore territory． 57．What does the underlined phrase"have the upper hand"mean in the 2nd paragraph？A A．be in the leading place B．fall behind C．be in a worse situation D．keep quiet 58．Which of the following CAN be used to introduce Lee Se-Dol？C A．Lee Se-Dol has only won 18medals in all since turning professional． B．Lee Se-Dol regretted accepting the challenge because he failed the game． C．South Korean Lee Se-Dol is one of the greatest Go players at present． D South Korean Lee Se-Dol beat the creative AlphaGo without difficulty． 59．Which statement is TRUE according to the passage？C A．AlphaGo forces us to change all the traditional rules and knowledge we learned in Go． B．Lee will compete with AlphaGo for 5more games and the winner will get one million． C．Go is a two-person game and was created in ancient China more than 3，000years ago． D．Although having lots of fun playing Go，Lee doesn't want a next game with AlphaGo． 60．Where can we most probably read this passage？A A．In a newspaper． B．In a travel magazine． C．In a text book． D．On a cinema poster．
