She was seriously ill, and though he prescribed(开药方) her medicine, she soon died. When he reached the woman's beside, it soon became clear to him that he could do little. I'll give you all this.' The doctor was reassured (使消除疑虑) and went into the house. 'Here I have $ 500, whether you cure my wife or you kill her. 'But if I save your wife, I am afraid you may not pay me.' 'Sir,' replied the lawyer. He knew that the lawyer was famous for not paying his bills, even if they were due(正当的). The doctor willingly came to see the woman and to do what he could for her, but before he went into the house, he made a short stop. In order to establish the 'fix' or precise location of a ship, the navigator must know_.ģ One day a layer' s wife fell ill, and he went to get a doctor. To get idea of our location, therefore, we need to know local time, Greenwich time, and the angle between Polaris and the horizon. Mathematicians tell us that this angle is equal to the latitude at the point in question.
This makes it possible to determine the latitude of a given point by setting our sextant (六分仪) to measure the angle between Polaris；the North Star, and the horizon. In the Northern Hemisphere there is a star called Polaris almost directly over the North Pole. Circles are drawn parallel to the Equator to indicate other values of latitude. The Equator is the zero line for the measurement of latitude. We must also know our latitude, which tells us how far we are north or south of the Equator. Of course, longitude gives only half of the information needed to determine our precise location. By maintaining chronometers on Greenwich time, ships can determine their longitude on any sunny day by merely noting the difference in hours between Greenwich time and local sun time and multiplying this difference by 15 degrees. New York is approximately 5 time zones west of Greenwich, so the time difference must be about 5 hours. The world is divided into 24 time zones, and each zone corresponds to 15 degrees of longitude. As we mentioned earlier, this corresponds to exactly 15 degrees of longitude, so our longitude must be 150 W. This means that there is one hours difference in time between our longitude and that of Greenwich. Let us wait until the sun is directly overhead (noon at our location) and then read the time on our clock. Our clock continues to tell us the time, not at our present location, but at Greenwich. As a matter of fact, when our clock reads noon, what it really means is that it's noon in Greenwich, England. At the time that our timepiece reads 12 o'clock, the sun has not quite reached the zenith. As we travel westward toward New York, we notice that the sun is going 'slower' than our chronometer. Imagine that we have set sail from Greenwich, England, after having set a very accurate clock, or chronometer, to the local Greenwich time. This reasoning can be used by navigators to determine their longitude. Since the sun appears to travel around the earth in 24 hours, it will move 360/24 or 15 degrees in one hour. New York has a longitude of 74 degrees west (74oW.) which means that it lies on the 74th meridian west of Greenwich. There are 180 degrees of longitude east of Greenwich and 180 degrees in the westerly direction.
The earth is divided into 360 degrees, and the meridians are numbered east and west from Greenwich. By international agreement, the meridian of longitude passing through Greenwich, England, is numbered zero. D．Becauseġ Longitude and Latitude The meridians of longitude are imaginary great circles drawn from pole to pole around the earth. why is the weight loss plan called the Scarsdale diet?Ī. Many complain that their energy levels are low, but most are very satisfied with the results. Although the amount of food that the dieter may eat is not limited, most dieters average less than one thousand calories a day. There is no alcohol, no oil and no sugar allowed, and raw celery or carrots are the only snacks allowed. For two weeks at a time the dieter must follow a strict menu that does not provide for any substitutions by the dieter. The diet is very simple, but it requires a great deal of discipline. Tarnower claims that a dieter who follows his plan will be able to lose up to 20 pounds in 2 weeks. Since his book the Complete Scarsdale Medical Diet was published last year, he has sold 270000 copies, and the diet has become a national pastime. The diet became popular when people from Scarsdale who had used the diet successfully sent mimeographed copies to their friends in other parts of the country. Herman Tarnower, a cardiologist and internist from Scarsdale, New York. It is called the Scarsdale diet and was originally outlined 20years ago by Dr. 单项选择题 听力原文： The latest diet fad is not really new.
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