62. While the fact of this consumer revolution is hardly in doubt, three key questions remain: who were the consumers?What were their motives? And what were the effect of the new demand for luxuries?

　　63. Although it has been possible to infer from the goods and services actually produced what manufacturers and servicing trades thought their customers wanted, only a study of relevant personal documents written by actual consumers will provide a precise picture of who wanted what.

　　64. With respect to their reasons for immigrating, Grassy does not deny their frequently noted fact that some of the immigrants of the 1630's, most notably the organizers and clergy, advanced religious explanations for departure, but he finds that such explanations usually assumed primacy only in retrospect.

　　65. If we take the age-and sex-specific unemployment rates that existed in 1956(when the overall unemployment rate was 4.1 percent)and weight them by the age- and sex-specific shares of the labor force that prevail currently, the overall unemployment rate becomes 5 percent.

　　66. He was puzzled that I did not want what was obviously a " step up" toward what all Americans are taught to want when they grow up: money and power.

　　67. Unless productivity growth is unexpectedly large, however, the expansion of real output must eventually begin to slow down to the economy's larger run growth potential if generalized demand pressures on prices are to be avoided.

　　68. However，when investment flows primarily in one direction, as it generally does from industrial to developing countries, the seemingly reciprocal source-based restrictions produce revenue sacrifices primarily by the state receiving most of the foreign investment and producing most of the income-namely, the developing country partner.

　　69. The pursuit of private interests with as little interference as possible from government was seen as the road to human happiness and progress rather than the public obligation and involvement in the collective community that emphasized by the Greeks.

　　70. The defense lawyer relied on long-standing principles governing the conduct of prosecuting attorneys: as quasi-judicial officers of the court they are under a duty not to prejudice a party's case through overzealous prosecution or to detract from the impartiality of courtroom atmosphere.

　　72. He made a hole and peering through, could see jewellery, and other objects stacked in piles in the shadows that extended beyond the beam of light penetrating the interior.

　　73. Neither Ayat nor the Rassoul brothers noticed, however, that most of the pieces they were selling were of a type not previously seen in the marketplace-pieces whose existence had been suspected but which had not yet been discovered by archaeologists.

　　74. "The biggest construction project of this century", explained French President Francois Mitterand in January, 1986 as he and then British prime minister Margaret Thatcher jointly announced that the two countries would finally overcome ancient quarrels and prejudices and forge a link across the narrow Channel separating them.

　　75. Perhaps the fact that many of these first studies considered only algae(水藻) of a size that could be collected in a net (net phytoplankton), a practice that overlooked the smaller phytoplankton(浮游植物群落)that we now know grazers are most likely to feed on, led to a de-emphasis of the role of grazers in subsequent research.

　　76. The converse observation, of the absence of grazers (食草动物)in areas of high phytoPlankton(浮游植物群落)concentration, led Hardy to propose his principle of animal exclusion, which hypothesized that phytoplankton produced a repellent(驱虫剂)that excluded grazers from regions of high phytoplankton concentration.

　　77. Although these molecules allow radiation at visible at wave lengths, where most of the energy of sunlight is concentrated, to pass through, they absorb some of the longer-wavelength, infrared emission(红外辐射)radiated from the Earth's surface, radiation that would otherwise be transmitted back into space.

　　78. In addition, the style of some Black novels, like Jean Toomer's Cane, verges on expressionism or surrealism(超现实主义), does this technique provide a counter point to the prevalent theme that portrays the fate against which Black heroes are pitted, a theme usually conveyed by more naturalistic modes of expression?

　　79. Roseenblatt's thematic analysis permits considerable objectivity;he even explicitly states that it is not his intention to judge the merit of the various works-yet his reluctance seems misplaced, especially since an attempt to appraise might have led to interesting results.

　　82. The hydrologic(水文地质的)cycle, a major topic in this science, is the complete cycle of phenomena through which water passes, beginning as atmospheric water vapor, passing into liquid and solid form as precipitation (降水(量)), thence along and into the ground surface, and finally again returning to the form of atmospheric water vapor by means of evaporation and transpiration(散发).

　　83. My point is that its central consciousness-its profound understanding of class and gender as shaping influences on people's lives-owes much to that earlier literary heritage, a heritage that, in general, has not been sufficiently valued by most contemporary literary critics.

　　84. In the early 1950's historians who studies preindustrial Europe (which we may define here as Europe in the period from roughly 1300 to 1800) began，for the first time in large numbers, to investigate more of the preindustrial European population than the 2 or 3 percent who comprised the political and social elite (精华) : the kings, generals, judges, nobles, bishops, and local magnates (要人)who had hitherto (迄今)usually filled history books.

　　85. The historian Frederick J. Tuner wrote in the 1890's that the agrarian(农民)discontent (不满)that had been developing steadily in the United States since about 1870 had been precipitated (加速)by the closing of the internal frontier-that is ，the depletion (枯竭)of available new land needed for further expansion of the American farming system.

　　86. Fallois proposed that Proust had tried to begin a novel in 1908, abandoned it for what was to be a long demonstration of Saint-Beure's blindness to the real nature of great writing, found the essay giving rise to personal memories and fictional developments，and allowed these to take over in a steadily developing novel.

　　87. The best evidence for the layered mantle (地幔)thesis is the well-established fact that volcanic rocks found on oceanic islands, islands believed to result from mantle plumes (地柱)arising from the lower mantle，are composed of material fundamentally different from that of the midocean ridge system,whose source, most geologists contend, is the upper mantle.

　　88. In October 1838, I happened to read for amusement Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on, from long continued observation of the habits of animals and plants, it at once struck me that, under these circumstances, favorable variations would tend to be preserved, and unfavourable ones to be destroyed.

　　89. But these beliefs about peptide hormones (肽激素)were questioned as laboratory after laboratory found that antiserums(抗血清)to peptide hormones, when injected into the brain, bind in places other than the hypothalamus(下丘脑), indicating that either the hormones or substances that cross-react with the antiserums are present.