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经脉上行与督脉会于头顶部的是
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Mount Rushmore Mount Rushmore is a monument to the ideals of the United States. The faces of four presidents who contributed to the formation of the nation are carved on Mount Rushmore in South Dakota. These four presidents are George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt. Each had a vision of what the United States of America should be and shaped the development of the country. Doane Robinson, the superintendent of the South Dakota State Historical Society, first envisaged the idea of a monument consisting of colossal stone carvings situated in South Dakota in 1923. He proposed the carving of giant statues of historical figures of the Old West, such as General George Custer and Kit Carson into a mountainside. Robinson lobbied for support of the idea, as he believed it would promote tourism in the area. Although many thought the idea was ludicrous, Robinson managed to enlist the support of U.S. Senator Peter Norbeck. Norbeck suggested that Robinson find a sculptor skilled enough to undertake the project, so Robinson contacted Gutzon Borglum, an American artist, who accepted the commission. Borglum was not interested in creating a sculpture using regional historical figures as subjects because he thought that such a sculpture would not be of great interest or historical importance. So Borglum, together with Norbeck and Robinson, decided upon a sculpture of great presidents who had contributed to the birth and development of the United States and to the achievement of its aspirations. Borglum selected Mount Rushmore in the Harney National Forest for his carving because it faced southeast and would be in direct sunlight for the better part of the day. The site was also ideal because the granite that made up the mountain was suitable for the work. Although Robinson, Norbeck, and Borglum managed to obtain permission for the project from the federal legislature, the project stalled due to opposition and lack of funding. Finally, in 1927, President Calvin Coolidge took an extended holiday in the area and was convinced that the project should proceed. As an indication of his commitment, he provided federal funding for the project. Coolidge insisted that the four presidents selected should include two Republicans and a Democrat, along with George Washington. Jefferson, Lincoln, and Roosevelt were chosen as they best represented the first 150 years of the United States of America, and were admired by the trio that had conceived and brought the project to fruition. Each president immortalized on Mount Rushmore made a significant contribution to the country. George Washington was the country’s first president, serving from 1789 to 1797. Washington was instrumental in the nation’s attainment of its independence from England and was responsible for the democracy now existing in the United States. Thomas Jefferson served as president from 1801 to 1809. He was responsible for the drafting of the Declaration of Independence and the Louisiana Purchase, which expanded the country westward. Abraham Lincoln was elected in 1860 but assassinated while still in office in 1865. Lincoln guided the country through the Civil War and was often referred to as "The Great Emancipator" for his part in the abolition of slavery. Theodore Roosevelt served as president from 1901 to 1909. He was responsible for the construction of the Panama Canal. However, Roosevelt’s inclusion was controversial because he had only been out of office for less than twenty-five years when the project started, so his contribution to the United States had not yet been judged by history. But despite the controversy, the project continued. In 1934, the team of artists and sculptors completed the face of George Washington, followed by Thomas Jefferson in 1936, Abraham Lincoln in 1937, and Theodore Roosevelt in 1939. It took 14 years to complete the sculpture on Mount Rushmore but only about six and half years were actually spent on carving. ■(A) Much of the work was accomplished with the use of dynamite and the rest with air hammers. ■(B) There were no fatalities and very few injuries among the workers during the construction of the sculpture. Unfortunately, Borglum died before the work was done. ■(C) His son Lincoln, named after President Lincoln, took over and finished the carvings on Mount Rushmore. ■(D) On 31 October 1941, the project was completed. The word "envisaged" in the passage is closest in meaning to
Mount Rushmore Mount Rushmore is a monument to the ideals of the United States. The faces of four presidents who contributed to the formation of the nation are carved on Mount Rushmore in South Dakota. These four presidents are George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt. Each had a vision of what the United States of America should be and shaped the development of the country. Doane Robinson, the superintendent of the South Dakota State Historical Society, first envisaged the idea of a monument consisting of colossal stone carvings situated in South Dakota in 1923. He proposed the carving of giant statues of historical figures of the Old West, such as General George Custer and Kit Carson into a mountainside. Robinson lobbied for support of the idea, as he believed it would promote tourism in the area. Although many thought the idea was ludicrous, Robinson managed to enlist the support of U.S. Senator Peter Norbeck. Norbeck suggested that Robinson find a sculptor skilled enough to undertake the project, so Robinson contacted Gutzon Borglum, an American artist, who accepted the commission. Borglum was not interested in creating a sculpture using regional historical figures as subjects because he thought that such a sculpture would not be of great interest or historical importance. So Borglum, together with Norbeck and Robinson, decided upon a sculpture of great presidents who had contributed to the birth and development of the United States and to the achievement of its aspirations. Borglum selected Mount Rushmore in the Harney National Forest for his carving because it faced southeast and would be in direct sunlight for the better part of the day. The site was also ideal because the granite that made up the mountain was suitable for the work. Although Robinson, Norbeck, and Borglum managed to obtain permission for the project from the federal legislature, the project stalled due to opposition and lack of funding. Finally, in 1927, President Calvin Coolidge took an extended holiday in the area and was convinced that the project should proceed. As an indication of his commitment, he provided federal funding for the project. Coolidge insisted that the four presidents selected should include two Republicans and a Democrat, along with George Washington. Jefferson, Lincoln, and Roosevelt were chosen as they best represented the first 150 years of the United States of America, and were admired by the trio that had conceived and brought the project to fruition. Each president immortalized on Mount Rushmore made a significant contribution to the country. George Washington was the country’s first president, serving from 1789 to 1797. Washington was instrumental in the nation’s attainment of its independence from England and was responsible for the democracy now existing in the United States. Thomas Jefferson served as president from 1801 to 1809. He was responsible for the drafting of the Declaration of Independence and the Louisiana Purchase, which expanded the country westward. Abraham Lincoln was elected in 1860 but assassinated while still in office in 1865. Lincoln guided the country through the Civil War and was often referred to as "The Great Emancipator" for his part in the abolition of slavery. Theodore Roosevelt served as president from 1901 to 1909. He was responsible for the construction of the Panama Canal. However, Roosevelt’s inclusion was controversial because he had only been out of office for less than twenty-five years when the project started, so his contribution to the United States had not yet been judged by history. But despite the controversy, the project continued. In 1934, the team of artists and sculptors completed the face of George Washington, followed by Thomas Jefferson in 1936, Abraham Lincoln in 1937, and Theodore Roosevelt in 1939. It took 14 years to complete the sculpture on Mount Rushmore but only about six and half years were actually spent on carving. ■(A) Much of the work was accomplished with the use of dynamite and the rest with air hammers. ■(B) There were no fatalities and very few injuries among the workers during the construction of the sculpture. Unfortunately, Borglum died before the work was done. ■(C) His son Lincoln, named after President Lincoln, took over and finished the carvings on Mount Rushmore. ■(D) On 31 October 1941, the project was completed. According to paragraph 4, all of the following statements about the Mount Rushmore project are true EXCEPT:
进入脑的经脉是
Natural Selection First coined by Darwin, the term natural selection refers to the process at the core of evolutionary theory. Simply put, Darwin believed that every living organism had to struggle to survive and reproduce. By random chance, some individuals in a species would have characteristics that made them better adapted to this struggle than their contemporaries. Such individuals would be more likely to reproduce and pass their characteristics on to their offspring. Over many generations, a series of small differences in characteristics would accumulate, until eventually the creatures that were produced would be so different from their original ancestors that they would constitute a new species. ■(A) Although Darwin did not know how variations between individual members of the same species were able to arise in the first place or how such traits could then be passed on from species to species, we now know that this process occurs through genes. ■(B) Genes determine what characteristics an organism will possess, from its size to its skin color to its gender. ■(C) Sometimes these genes become damaged or altered--a process known as mutation. ■(D) Most mutations are either too small to have any effect, or have detrimental effects on the organism. A few, however, can be beneficial to helping an organism survive. The organisms with these beneficial mutations are the ones that .survive and reproduce, passing their particular genetic mutation on to future generations. Originally, Darwin thought that two particular types of traits were naturally selected for evolution. The first type included any and all traits that helped an organism survive, either by giving it easier access to food, better protection from predators, or superior adaptability to shifting environmental conditions. Several examples of the natural selection of such traits have been observed since Darwin first proposed his theory. The most often cited example is the coloration of moths near industrial centers. Some of them have white wings and the others have black wings. Under normal conditions, the lighter-colored moths predominate since white moths are less visible against the light-colored bark of the trees in the forests where they live, which means they can more easily avoid predators. Near industrial centers, however, darker-colored moths predominate, as the pollution from the factory has darkened the bark of the nearby trees. Moths landing on these trees are much more difficult to see if they have black wings. This trait has now become most common in moth populations living in areas where pollutants have changed the color of the tree bark. The second type of naturally selected traits envisioned by Darwin involved those characteristics of an organism that made it easier for that organism to find a mate. This form of natural selection, often called sexual selection, was thought to explain the existence of highly developed traits in certain animals that seemed to play no particular role in their survival, and that in some cases seemed to make it even harder for them to survive. A prime example of such a trait is the peacock’s elaborate, colorful tail feathers. A long, unwieldy tail that can expand into a display of bright colors that draws the attention of any predator in the vicinity seems less likely than that of other kinds of birds to help the bird survive. However, researchers discovered that peahens invariably chose to mate with those peacocks whose tail feathers produced the most artistic displays. Thus, although the peacock’s tail feathers have no adaptive function in terms of coping with survival pressure, the gene that controls feather color is the one that is most likely to be passed on because of its role in the mating process. Many scientists now believe that a third type of naturally selected characteristics exists, namely those that may be harmful to an individual organism but beneficial to that organism’s species. This helps to explain the persistence of certain traits that were viewed under traditional evolutionary theory as not assisting in adaptation. For instance, in many animal species, including humans, a small subset of the population is homosexual. Under the old view of evolution, this could not be accounted for since homosexual individuals do not normally reproduce, meaning the gene that codes for it should have long been phased out of the gene pool. However, recent studies among wild sheep populations have found that the prevalence of homosexuality in the sheep population increases in times of severe food shortages, causing the sheep to form stronger bonds with sheep of the same sex than they otherwise would. As a result, instead of fighting over a particular food source, these sheep share the food they find with each other, increasing the species’ chance of surviving hard times. Though still controversial, the idea that traits may be naturally selected because of their benefits to the species instead of their benefits to the individual is rapidly gaining acceptance in the scientific community because of the wide array of characteristics that it can explain, including the human tendency towards altruism, Look at the four squares [■] in the passage that indicate where the following sentence can be added to the passage. All of the information about an organism’s physiology is contained in its DNA, which is a strand of organic chemicals composed of sequences of nucleotides called genes. Where would this sentence best fit
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