TASK DEFINITION: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
PROBLEM: Article: Australian sleep researchers have developed a set of hi-tech "sunglasses", described as the world's first "time control" glasses, which can imitate sunlight patterns. The team, from Flinders University, in Adelaide, says the glasses send out a soft green glow that helps a traveller adapt to changing sleep patterns and time zones in "small steps". It targets a part of the brain that regulates the human body-clock, by sending signals to the rest of the body that help it slowly realise it is in a different area of the world. It has been suggested the device, called the "Re-Timer", is currently the only wearable body clock adjustment system commercially available. Scientists say the device, officially launched in South Australia, can help ridf the negative effects of long-timel travel and bring new relief to insomnia sufferers, shift workers and even teenagers. "The light from Re-Timer stimulates the part of the brain responsible for regulating the 24-hour body clock," said Prof Leon Lack, its chief inventor. Extensive research has shown that green light is one of the most effective wavelengths for influencing the body clock. The battery-powered device, which retail for PS162 in Britain, then sends signals that cause the production of hormones and daily cycles known as circadian rhythms . Those people who want to sleep peacefully, but wake earlier, should wear it for 50 minutes in the morning for three days. Those who want a lie- in, should wear it for the same time before bed to delay the body clock. The device, which is powered by an inbuilt rechargeable battery, can also be worn as sunglasses during daily tasks such as reading or using a computer. "The glasses have been designed to be user friendly and comfortable to wear so people can go about their normal activities wearing them at work or at home," he said, adding they had been designed based on 25 years of university research. It is estimated that up to 94 per cent of long-time travellers suffer from jet lag because the body becomes confused to travelling through different time zones. So the glasses are good news to them. It uses the outside world as indicators as to whether it should be awake or asleep including factors such as light, silence or noise. Airlines are said to be seeking a "silver bullet" for the tiredness and confusion that often follow a long-timel flight and are in discussions to buy the device.
Answer: motivating part of the brain

SOLUTION: The "time control" glasses work by _ .

PROBLEM: Article: "My dream has come true.I have always wanted to be a Grand Slam champion." These are the words of the Chinese tennis player Li Na after she became the first Asian woman to win the Australian Open final on Jan.25th.2014. "People were saying I'm getting old.So this is a great success for such an old woman." the 32-year-old girl joked. Miss Li has a tattoo . She has dyed her hair many different color1s.And, at the 2008 Beijing Olympics, she told her fans to "shut up" when they got too noisy in their support. Li Na was born in Wuhan.She started to play tennis at the age of 6.She once recalled: "As a child. I suffered a lot because every day I had to wake up early to practice.After school I had to practice more.I didn't have time to play." Luckily, the strong girl didn't give up. thus making history for Chinese tennis time after time.Now the new champion is already thinking about winning another Grand Slam title."When you have one title, surely you will think about another," she says. not hiding her ambition. "Chinese people are so lacking in confidence on the tennis court.If there is a person like me who can prove we Chinese can do it, the other young players in China will feel the same." she said.
Answer: 1988

SOLUTION: Li Na began to learn playing tennis in the year of _ .

PROBLEM: Article: Feel tired lately? Has a doctor said he can't find anything wrong with you? Perhaps he sent you to a hospital, but all the advanced equipment there shows that there is nothing wrong with you. Then , consider this: you might be in a state of sub - health . Sub - health, also called the third state or gray state, is explained as a borderline state between health and disease. According to the survey by the National Health Organization, Over 45 percent of sub - healthy people are middle-aged or elderly. The percentage is even higher among people who work in management positions as well as students around exam week. Symptoms include a shortage of energy, depression, slow reactions, insomnia and poor memory , Other symptoms include shortness of breath, sweating and aching in the waist and legs. The key to preventing and recovering from sub - health, according to some medical experts, is to form good living habits, ale mate work and rest, exercise regularly, and take part in open air activities. As for meals, people are advised to eat less salt and sugar . They should also eat more fresh vegetables, fruits, fish because they are rich in nutritional elements - vitamins and trace elements - that are important to the body. Nutrition experts point out that it is not good to eat too much at one meal because it may cause unhealthy changes in the digestive tract . They also say that a balanced diet is very helpful in avoiding sub - health.
Answer: find out the reasons and relax yourself

SOLUTION:
When you are in a state of sub - health, you should _ .