【文章內(nèi)容簡(jiǎn)介】 or further growth. ,who a poet ,playwright, literary critic ,and editor ,was a leader of the Modemist movement in poetry. Pacific Ocean prises almost the entire boundary western of North and South America. 22．Established in 1948 ,the State University of New York is the singly largest university system in the United States. disseminates information about humanity and nature ,records the visible world, and extension human knowledge into areas the eye cannot penetrate. of their rapidly changing economically fortunes, many frontier towns of the American West underwent spectacular fluctuations in population in the nineteenth century. no disease exists today for which there is no drug that can be given ,neither to cure the disease or to alleviate its symptoms. is essential for blood clotting ,for the action of certain enzymes, and for the normal contraction and relax of muscles. large collection of the Williams College Museum of Art includes ancient and medieval art ,but much exhibits are modern or contemporary. technique of spectroscopy allows analyst of ining light after it has been separated into its ponent wavelengths by passage through a prism. ,fifty years after its construction ,the Alaska Highway conveys 40,000 vehicles in normal year. prehistoric times ,artists (have been) arranged colors on surfaces (in ways) (that express) their ideas (about people) ,the world ,and religion. 31.(Few substances) look less (alike than) coal and diamonds ,yet both (are fashioned) (from same) elemental carbon. can program their putes to scan for a specific set of weather criteria, such as falling barometric pressure ,increase cloud cover ,and rising humidity. is formed when siliceous lava cools too rapidly to crystallized into rockforming minerals. settlers in North America moved from the Atlantic coast across 3,000 miles forests, grasslands, deserts, and mountains until they reached the Pacific Ocean. tries to discover the nature of true and knowledge and to find what is of basic value and importance in life. this world of high technology ,it is easy to forget that the most important tools ever developed for learning is still the book. element potassium makes up less than one half percentage of the human body. thousand years ago a sheet of ice a thousand meters thick covered the coastal region which the cities of Vancouver and Juneau now are located. Crow ,Blackfoot ,and Sioux tribes traditionally adorned they dwellings and costumes with colorful and highly valued beaded decorations. the late 1800’s ,United States painter Thomas Eakins develop a broad ,powerful Realist style that became almost expressionistic in his later years. Questions 19:Europa is the smallest of planet Jupiter’s four largest moons and the second moonout from Jupiter. Until 1979, it was just another astronomy textbook statistic. Thencame the closeup images obtained by the exploratory spacecraft Voyager 2, and withindays, Europa was transformedin our perception, at leastinto one of the solar system’s(5)most intriguing worlds. The biggest initial surprise was the almost total lack of detail,especially from far away. Even at close range, the only visible features are thin, kinkedbrown lines resembling cracks in an eggshell. And this analogy is not far off the mark.The surface of Europa is almost pure water ice, but a nearly plete absence of craters indicates that Europa’s surface ice resembles Earth’s Antarctic ice cap. The(10) eggshell analogy may be quite accurate since the ice could be as little as a few kilometersthick –a true shell around what is likely a subsurface liquid ocean that , in turn, encases a rocky core. The interior of Europa has been kept warm over the eons by tidal forces generated by the varying gravitational tugs of the other big moons as they wheel around Jupiter. The tides on Europa pull and relax in an endless cycle. The resulting internal heat(15) keeps what would otherwise be ice melted almost to the surface. The cracklike marks on Europa’s icy face appear to be fractures where water or slush oozes from below. Soon after Voyager 2’s encounter with Jupiter in 1979, when the best images of Europa were obtained, researchers advanced the startling idea that Europa’s subsurface ocean might harbor life. Life processes could have begun when Jupiter was releasing a(20 )vast store of internal heat. Jupiter’s early heat was produced by the pression of the material forming the giant planet. Just as the Sun is far less radiant today than the primal Sun, so the internal heat generated by Jupiter is minor pared to its former intensity. During this warm phase, some billion years ago, Europa’s ocean may have been liquid right to the surface, making it a crucible for life.1. What does the passage mainly discuss?(A) The effect of the tides on Europa’s interior(B) Temperature variations on Jupiter’s moons(C) Discoveries leading to a theory about one of Jupiter’s moons(D) Techniques used by Voyager 2 to obtain closeup images. 2. The word “intriguing” in line 5 is closest in meaning to(A) changing(B) perfect(C) visible(D) fascinating 3. In line 7, the another mentions “cracks in an eggshell” in order to help readers(A) visualize Europa as scientists saw it in the Voyager 2 images(B) appreciate the extensive and detailed information available by viewing Europa from far away(C) understand the relationship of Europa to the solar system(D) recognize the similarity of Europa to Jupiter’s other moons4. It can be inferred from the passage that astronomy textbooks prior to 1979(A) provided ma