题目

Climate change will increase US wildfires,and the smoky air will cause terrible problems in areas far beyond those burned,reports an environmental group Thursday. Two-thirds of Americans,or nearly 212 million,lived in states suffering from wildfire smoke three years ago,according to the report by the Natural Resources Defense Council(NRDC).These areas,which had smoke for at least a week,were nearly 50 times greater than those burned directly by fire. “It affects a much wide area of the United States than people have realized.” says author Kim Knowlton,a Columbia University health C Healthy Habits, Healthy Body 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(亚健康)． Sub-health, also called the third state or gray state, is explained as a borderline state between health and disease． According to the investigation 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(征兆)include a lack of energy, depression(压抑),slow reactions, insomnia(失眠),agitation, 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, alternate 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 …vitamins and trace elements…that are important to the body． Nutrition(营养)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(消化系统)．They also say that a balanced diet is very helpful in avoiding sub-health． 63．According to this passage, which of the following is right? A．When you are in a state of sub-health, you should stay home and keep silent． B．When you are in a state of sub-health, you should go to see a doctor and buy some medicine． C．When you are in a state of sub-health, you should have yourself examined in foreign countries． D．When you are in a state of sub-health, you should find out the reasons and relax yourself． 64．Middle-aged people may be easy to get sub-health because ___. A．they have used up their energy       B．they have lost their living hopes C．they have more pressure in life and work D．they begin to get older 65．The key to preventing you from falling into a state of sub-health is that you should ___. A．work hard                           B．sleep more C．form good living habits               D．take more medicine 66．As for food, experts suggested that ___. A．we should never eat meat       B．we should have variety of food C．we should eat less than usual   D．we should have meals without salt to sugar 67．The bold-faced word “alternate” in this passage is closest in meaning to ___. A．arrange by turns         B．cause to take place         C．keep up                 D．take up