阅读表达。 Feeling tired lately? Has the 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. Then consider this, you might be in a state of sub-health (亚健康). Sub-health, also called the third state or grey state, is explained as an indefinite (不确定的) state between health and disease. According to an investigation by the National Health Organization, over 45 percent of sub- health people are middle-aged or elderly. The percentage is even higher among people who work in management position as well as students around exams. Symptoms (症状) include a lack of energy, depression, slow reaction, insomnia, worries and poor memory. Other symptoms include shortness of breath, sweating and aching on the waist and legs. The key to preventing and recovering from sub-health, according to some medical experts, is to form good living habits, alternate (交替) work with rest, exercise regularly, and take part in open air activities. As for meals, people are advised to eat less salt and sugar. They should eat more fresh vegetables, fruits and fish, because they are rich in nutritional elements-vitamins and tiny elements-those 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 _____. 1. What is the best title of the passage? (Please answer within 10 words.) _______________________________________________________________________________________ 2. Which sentence in the passage can be replaced by the following one? If you feeling weak, depressed, have a slow reaction, poor memory and can't sleep well, you are most likely to have suffered sub-health. _______________________________________________________________________________________ 3. Please fill in the blank with proper words or phrases. (Please answer within 10 words.) _______________________________________________________________________________________ 4. Which of the suggestions do you think is the most important? Why? (Please answer within 30 words.) _______________________________________________________________________________________ 5. Translate the underlined sentence in the first paragraph into Chinese. _______________________________________________________________________________________