日期：2008-10-25 Passage 44 According to a recent theory， Archean-age gold-quartz vein systems were formed over two billion years ago from magmatic fluids that originated from molten granitelike bodies deep beneath the surface of the Earth. This theory is（5） cont... 阅读全文>>

日期：2008-10-25 Passage 43 Historians of womens labor in the United States at first largely disregarded the story of female service workers-women earning wages in occupations such as salesclerk.domestic servant， and office secretary. These historians（5） focused... 阅读全文>>

日期：2008-10-25 Passage 42 Excess inventory， a massive problem for many busi-nesses，has several causes，some of which are unavoidable. Overstocks may accumulate through production overruns or errors. Certain styles and colors prove unpopular. With（5） some produ... 阅读全文>>

日期：2008-10-25 Passage 41 It was once assumed that all living things could be divided into two fundamental and exhaustive categories. Multicellular plants and animals， as well as many unicellu-lar organisms，are eukaryotic-their large，complex cells（5） have a w... 阅读全文>>

日期：2008-10-25 Passage 40 Joseph Glarthaars Forged in Battle is not the first excel-lent study of Black soldiers and their White officers in the Civil War， but it uses more soldiers letters and diaries- including rare material from Black soldiers-and concen-（5）... 阅读全文>>

日期：2008-10-25 Passage 39 Historians sometimes forget that history is conunu-ally being made and experienced before it is studied， interpreted， and read. These latter activities have their own history， of course， which may impinge in unex-（5） pected ways on... 阅读全文>>

日期：2008-10-25 Passage 38 It was once believed that the brain was independent of metabolic processes occurring elsewhere in the body. In recent studies， however， we have discovered that the production and release in brain neurons of the neuro-（5） transmitter s... 阅读全文>>

日期：2008-10-25 Passage 37 Japanese firms have achieved the highest levels of manufacturing efficiency in the world automobile industry. Some observers of Japan have assumed that Japanese firms use the same manufacturing equipment（5）and techniques as United State... 阅读全文>>

日期：2008-10-25 Passage 36 Protein synthesis begins when the gene encoding a protein is activated. The genes sequence of nucleotides is transcribed into a molecule of messenger RNA （mRNA），which reproduces the information contained in that（5） sequence. Transpor... 阅读全文>>

日期：2008-10-25 Passage 35 It can be argued that much consumer dissatisfaction with marketing strategies arises from an inability to aim advertising at only the likely buyers of a given product. There are three groups of consumers who are affected（5） by the marke... 阅读全文>>

日期：2008-10-25 Passage 34 Kazuko Nakanes history of the early Japanese immi-grants to central Californias Pajaro Valley focuses on the development of farming communities there from 1890 to 1940. The Issei （first-generation immigrants）（5） were brought into the... 阅读全文>>

日期：2008-10-25 Passage 33 Until recently most astronomers believed that the space between the galaxies in our universe was a near-perfect vacuum. This orthodox view of the universe is now being challenged by astronomers who believe that a（5） heavy rain of gas is... 阅读全文>>

日期：2008-10-25 Passage 32 Increasingly， historians are blaming diseases imported from the Old World for the staggering disparity between the indigenous population of America in 1492-new esti-mates of which soar as high as 100 million， or approxi-（5）mately one-... 阅读全文>>

日期：2008-10-25 Passage 31 The number of women directors appointed to corpo-rate boards in the United States has increased dramati-cally， but the ratio of female to male directors remains low. Although pressure to recruit women directors，（5） unlike that to empl... 阅读全文>>

日期：2008-10-25 Passage 30 Since the early 1970s， historians have begun to devote serious attention to the working class in the United States. Yet while we now have studies of working-class communities and culture， we know（5） remarkably little of worklessness.... 阅读全文>>

日期：2008-10-25 Passage 29 Studies of the Weddell seal in the laboratory have described the physiological mechanisms that allow the seal to cope with the extreme oxygen deprivation that occurs during its longest dives， which can extend 500（5） meters below the oc... 阅读全文>>

日期：2008-10-25 Passage 28 The settlement of the United States has occupied traditional historians since 1893 when Frederick Jackson Turner developed his Frontier Thesis， a thesis that explained American development in terms of westward（5） expansion. From the pe... 阅读全文>>

日期：2008-10-25 Passage 27 Since the late 1970s， in the face of a severe loss ofmarket share in dozens of industries， manufacturers inthe United States have been trying to improve produc-tivity-and therefore enhance their international（5） competitiveness-throug... 阅读全文>>

日期：2008-10-25 Passage 26 In choosing a method for determining climatic condi-tions that existed in the past， paleoclimatologists invokefour principal criteria. First， the materialrocks， lakes，vegetation， etc-on which the method relies must be（5） widespread... 阅读全文>>

日期：2008-10-25 Passage 25 In 1977 the prestigious Ewha Womens University inSeoul， Korea， announced the opening of the firstwomens studies program in Asia. Few academicprograms have ever received such public attention. In（5） broadcast debates， critics dismisse... 阅读全文>>