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Emerging from the 1980 census is the picture of a nation developing more and more regional competition, as population growth in the Northeast and Midwest reaches a near standstill. This development―and its strong implications for US politics and economy in years ahead―has enthroned the South as America’’s most densely populate region for the first time in the history of the nation’’s head counting. Altogether, the US population rose in the 1970s by 23.2 million people―numerically the third-largest growth ever recorded in a single decade. Even so, that gain adds up to only 11.4 percent, lowest in American annual records except for the Depression years. Americans have been migrating south and west in larger numbers since World War Ⅱ , and the pattern still prevails. Three sun-belt states―Florida, Texas and California―together had nearly 10 million more people in 1980 than a decade earlier. Among large cities, San Diego moved from 14th to 8th and San Antonio from 15th to 10th―with Cleveland and Washington D. C. , dropping out of the top 10. Not all that shift can be attributed to the movement out of the snow belt, census officials say. Nonstop waves of immigrants played a role, too―and so did bigger crops of babies as yesterday’’s "baby boom" generation reached its child-bearing years. Moreover, demographers see the continuing shift south and west as joined by a related but newer phenomenon: More and more, Americans apparently are looking not just for places with more jobs but with fewer people, too. Some instances: Regionally, the Rocky Mountain states reproved the most rapid growth rate―37.1 percent since 1970 in a vast area with only 5 percent of the US population. Among states, Nevada and Arizona grew fastest of all: 63.5 and 53.1 percent respectively. Except for Florida and Texas, the top 10 in rate of growth is composed of Western state with 7.5 million people―about 9 per square mile. The flight from overcrowdedness affects the migration from snow belt to more-bearable climates. Nowhere do 1980 census statistics dramatize more the American search for spacious living than in the Far West. There, California added 3.7 million to its population in the 1970s, more than any other state. In that decade ,however, large numbers also migrated from California, mostly to other parts of the West. Often they chose―and still are choosing―somewhat colder climates such as Oregon, Idaho and Alaska in order to escape smog, crime and other plagues of urbanization in the Golden State. As a result, California’’s growth rate dropped during the 1970s, to 18.5 percent―little more than two thirds the 1960s’’ growth figure and considerably below that of other Western states. The census distinguished itself from previous studies on population movement in that ____________.
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Albert Einstein once said, "The whole of science is nothing more than a refinement of everyday thinking." The first thing scientists must do is to ask a question or identify a problem to be investigated. 46) Then scientists working on this problem collect scientific data, or facts, by making observations and taking measurements, which must be verified or confirmed by repeated observations and measurements, ideally by several different investigators. 47) The primary goal of science is not facts in and of themselves, but a new idea, principle, or model that connects and explains certain facts and leads to useful predictions about what should happen in nature. Scientists working on a particular problem try to come up with a variety of possible explanations or scientific hypotheses of what they (or other scientists)observe in nature. Then experiments are conducted (and repeated to be sure they are reproducible)to test the deductions or predictions for each hypothesis so as to arrive at the most plausible or useful hypothesis. 48) If many experiments by different scientists support a particular hypothesis, it becomes a scientific theory―a well-tested and widely accepted idea, principle, or model that usually ties together and explains many facts that previously appeared to be unrelated. Converting a scientific hypothesis to a scientific theory is a difficult process, often requiring decades, even hundreds of years. To scientists, theories are not to be taken lightly ,for they are ideas or principles stated with a high degree of certainty because they are supported by a great deal of evidence. Another end result of science is a scientific law ―a description of what we find happening in nature over and over in the same way, without known exception. The more complex the parts of nature scientists study, the more difficult it becomes to discover scientific laws. 49) There are many scientific laws of physics and chemistry, only a few in biology, and even fewer (and less reliable ones) in fields involving complex interactions of multiple factors ( variables), such as ecology, climatology( study of climate) ,and social sciences such as economics and politics. The scientific process requires not only logical reasoning, but also imagination, creativity, and intuition. According to physicist Albert Einstein," There is no completely logical way to a new scientific idea. "50) Intuition, imagination, and creativity are as important in science as they are in poetry, art, music, and other great adventures of the human spirit that awaken us to the wonder, mystery, and beauty of life, the Earth and the universe. Albert Einstein once said, "The whole of science is nothing more than a refinement of everyday thinking." The first thing scientists must do is to ask a question or identify a problem to be investigated. 46) Then scientists working on this problem collect scientific data, or facts, by making observations and taking measurements, which must be verified or confirmed by repeated observations and measurements, ideally by several different investigators. 47) The primary goal of science is not facts in and of themselves, but a new idea, principle, or model that connects and explains certain facts and leads to useful predictions about what should happen in nature. Scientists working on a particular problem try to come up with a variety of possible explanations or scientific hypotheses of what they (or other scientists)observe in nature. Then experiments are conducted (and repeated to be sure they are reproducible)to test the deductions or predictions for each hypothesis so as to arrive at the most plausible or useful hypothesis. 48) If many experiments by different scientists support a particular hypothesis, it becomes a scientific theory―a well-tested and widely accepted idea, principle, or model that usually ties together and explains many facts that previously appeared to be unrelated. Converting a scientific hypothesis to a scientific theory is a difficult process, often requiring decades, even hundreds of years. To scientists, theories are not to be taken lightly ,for they are ideas or principles stated with a high degree of certainty because they are supported by a great deal of evidence. Another end result of science is a scientific law ―a description of what we find happening in nature over and over in the same way, without known exception. The more complex the parts of nature scientists study, the more difficult it becomes to discover scientific laws. 49) There are many scientific laws of physics and chemistry, only a few in biology, and even fewer (and less reliable ones) in fields involving complex interactions of multiple factors ( variables), such as ecology, climatology( study of climate) ,and social sciences such as economics and politics. The scientific process requires not only logical reasoning, but also imagination, creativity, and intuition. According to physicist Albert Einstein," There is no completely logical way to a new scientific idea. "50) Intuition, imagination, and creativity are as important in science as they are in poetry, art, music, and other great adventures of the human spirit that awaken us to the wonder, mystery, and beauty of life, the Earth and the universe.
隔离层一般为结构层或保温层与防水层之间的过渡层，它直接影响着屋面的防水效果。( )
Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following were first to take Hamburgers to America
Ever since it was built, the Empire State Building has captured the attention of young and old alike: every year, millions of tourists flock to the Empire State Building to get a glimpse from its 86th and 102nd floor observatories; the image of the Empire State Building has appeared in hundreds of ads and movies, not to mention the countless toys, models, postcards, ashtrays, thimbles, etc. that bear the image. Yet, why does the Empire State Building appeal to so many When the Empire State Building opened on May 1, 1931, it was the tallest building in the world -- standing at 1,250 feet tall. This building not only became an icon of New York City, it became a symbol of twentieth century man’s attempts to achieve the impossible. When the Eiffel Tower (984 feet) was built in 1889 in Paris it, in a way, taunted American architects to build something taller. By the early twentieth century, a skyscraper race was on. By 1909 the Metropolitan Life Tower rose 700 feet (50 stories), quickly followed by the Woolworth Building in 1913 at 792 feet (57 stories), and soon surpassed by the Bank of Manhattan Building in 1929 at 927 feet (71 stories). When John Jacob Raskob (previously a vice president of General Motors) decided to join in the skyscraper race, Walter Chrysler (founder of the Chrysler Corporation) was constructing a monumental building, the height of which he was keeping secret until the building’s completion. Not knowing exactly what height he had to beat, Raskob started construction on his own building. In 1929, Raskob and his partners bought a parcel of property at 34th Street and Fifth Avenue for their new skyscraper. Raskob was able to purchase the site for approximately ＄16 million. After deciding on and obtaining a site for the skyscraper, Raskob needed a plan. Raskob hired Shreve, Lamb & Harmon to be the architects for his new building. The logic of the plan is very simple. A certain amount of space in the center, arranged as compactly as possible, contains the vertical circulation, mail chutes, toilets, shafts and corridors. Surrounding this is a perimeter of office space 28 feet deep. The race was getting very competitive. With the thought of wanting to make the Empire State Building higher, Raskob himself came up with the solution. After examining a scale model of the proposed building, Raskob said, "It needs a hat!" Looking toward the future, Raskob decided that the "hat" would be used as a docking station for dirigibles. The new design for the Empire State Building, including the dirigible mooring mast, would make the building 1,250 tall (the Chrysler Building was completed at 1,046 feet with 77 stories). How many stories are there in the Empire State Building
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