题目内容
Singing Alarms Could Save the Blind If you cannot see, you may not be able to find your way out of a burning building and that could be fatal. A company in Leeds could change all that (51) directional sound alarms capable of guiding you to the exit. Sound Alert, a company (52) the University of Leeds, is installing the alarms in a residential home for (53) people in Sommerset and a resource centre for the blind in Columbia. (54) produce a wide range of frequencies that enable the brain to determine where the (55) is coming from. Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be (56) by humans. "It’s a burst of white noise (57) people say sounds like static on the radio," she says. "Its life-saving potential is great." She conducted an experiment in which people were filmed by thermal-imaging cameras trying to find their way out of a large (58) room. It (59) them nearly four minutes to find the door (60) a sound alarm, but only 15 seconds with one. Withington studies how the brain (61) sounds at the university. She says that the (62) of a wide band of frequencies can be pinpointed more easily than the source of a narrow band. Alarms (63) the same concept have already been installed on emergency vehicles. The alarms will also include rising or falling frequencies to indicate whether people should go up (64) down stairs. They were (65) with the aid of a large grant from British Nuclear Fuels.
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Diet Persons who are overweight should watch their diet carefully in order to lose pounds. The best way to do this is to start a weight control program. At first it is wise to talk with your doctor. He can advise you of the number of calories you should have in your meals each day. He can tell you about exercising while on your diet. A good rule is to lose slowly. A loss of a pound or two is plenty. Plan meals around foods you know. This means that it is wise to include foods that you are used to and that are part of your regular eating habits. When you have lost the weight you wish, Simple items can be added to your diet so that you can maintain the weight you want. While you are dieting, try to build a pattern of eating that you can follow later to maintain your desired weight. When dieting, choose low-calorie foods. Avoid such items as fats, fried food, sweets, cakes, cream and soft drinks. Try to take coffee and tea without sugar or cream. Snacks can be part of your diet. For example, a piece of fruit or a simple dessert saved from mealtime can be eaten between meals. Keep busy! This way you will not be tempted to go off the diet. Make full use of opportunities to exercise. Try walking instead of riding whenever possible. Happy dieting! What is the main idea of the passage
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