20xx年考研英语写作突破100题讲义(编辑修改稿)

20xx年考研英语写作突破100题讲义(编辑修改稿)内容摘要：

Emerging from the 1980 census is the picture of a nation developing more and more regional petition, 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 populated region for the first time in the history of the nation‘s head counting. Altogether, the US population rose in the 1970s by million people—numerically the thirdlargest growth ever recorded in a single decade. Even so, that gain adds up to only percent, lowest in American annual records except for the Depression years. Americans have been migrating south and west in larger numbers since World 7 War Ⅱ , and the pattern still prevails. Three sunbelt 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 childbearing 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 reported the most rapid growth rate— percent since 1970 in a vast area with only 5 percent of the US population. • Among states, Nevada and Arizona grew fastest of all: and percent respectively. Except for Florida and Texas, the top 10 in rate of growth is posed of Western states with 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 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 percent—little more than two thirds the 1960s‘ growth figure and considerably below that of other Western states. 1. Discerned from the perplexing picture of population growth the 1980 census provided, America in 1970s ____. [A] enjoyed the lowest growth of population in history [B] witnessed a southwestern shift of population [C] underwent an unparalleled period of population growth [D] brought to a standstill its pattern of migration since World War II 8 2. The census distinguished itself from previous studies on population movement in that ____. [A] it stresses the climatic influence on population distribution [B] it highlights the contribution of continuous waves of immigrants [C] it reveals the Americans‘ new pursuit of spacious living [D] it elaborates the delayed effects of yesterday‘s ―baby boom‖ 3. We can see from the available statistics that ____. [A] California was once the most thinly populated area in the whole US [B] the top 10 states in growth rate of population were all located in the West [C] cities with better climates benefited unanimously from migration [D] Arizona ranked second of all states in its growth rate of population 4. The word ―demographers‖ (Line 1, Paragraph 7) most probably means ____. [A] people in favor of the trend of democracy [B] advocates of migration between states [C] scientists engaged in the study of population [D] conservatives clinging to old patterns of life Text 5 Scattered around the globe are more than 100 small regions of isolated volcanic activity known to geologists as hot spots. Unlike most of the world‘s volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earth‘s surface。 on the contrary, many of them lie deep in the interior of a plate. Most of the hot spots move only slowly, and in some cases the movement of the plates past them has left trails of dead volcanoes. The hot spots and their volcanic trails are milestones that mark the passage of the plates. That the plates are moving is now beyond dispute. Africa and South America, for example, are moving away from each other as new material is injected into the sea floor between them. The plementary coastlines and certain geological features that seem to span the ocean are reminders of where the two conti nents were once joined. The relative motion of the plates carrying these continents has been constructed in detail, but the motion of one plate with respect to another, cannot readily be translated into motion with respect to the earth‘s interior. It is not possible to determine whether both continents are moving in opposite directions or whether one continent is stationary and the other is drifting away from it. Hot spots, anchored 9 in the deeper layers of the earth, provide the measuring。