窒息、冷却、辐射及对火焰燃烧起化学抑制作用是（ ）的集中体现，其中化学抑制作用是灭火的基本原理，起主要灭火作用。 A．泡沫灭火效能 B．干粉灭火效能 C．气体灭火效能 D．水灭火效能

On nothing per annum, then, and during a course of some two or three years, of which we can afford to give but a very brief history, Crawley and his wife lived very happily and comfortably at Paris. It was in this period that he quitted the Guards, and sold out of the army. When we find him again, his mustachios and the title of Colonel on his card are the only relics of his military profession. It has been mentioned that Rebecca, soon after her arrival in Paris, took a very smart and leading position in the society of that capital, and was welcomed at some of the most distinguished houses of the restored French nobility. The English men of fashion in Paris courted her, too, to the disgust of the ladies their wives, who could not bear the parvenue. For some months the salons of the Faubourg St. Germain, in which her place was secured, and the splendours of the new Court, where she was received with much distinction, delighted, and perhaps a little intoxicated Mrs. Crawley, who may have been disposed during this period of elation to slight the people-honest young military men mostly-who formed her husband s chief society. But the Colonel yawned sadly among the Duchesses and great ladies of the Court. The old women who played ecart6 made such a noise about a five-franc piece, that it was not worth Colonel Crawley s while to sit down at a card-table. The wit of their conversation he could not appreciate, being ignorant of their language. And what good could his wife get, he urged, by making curtsies every night to a whole circle of Princesses? He left Rebecca presently to frequent these parties alone; resuming his own simple pursuits and amusements amongst the amiable friends of his own choice. The truth is, when we say of a gentleman that he lives elegantly on nothing a year, we use the word 'nothing' to signify something unknown, meaning, simply, that we dont know how the gentleman in question defrays the expenses of his establishment. Questions:This passage is taken from a famous novel entitled______. 点击查看答案

Human wants seem endless. When a starving man gets a meal, he begins to think about an overcoat; when an executive gets a new sports car, visions of country clubs and pleasure boats dance into view. The many wants of mankind might be regarded as making up several levels. When there is money enough to satisfy one level of wants, another level appears. The first and most basic level of wants involves food. Once this want is satisfied, a second level of wants appears: clothing and some sort of shelter. By the end of World WarⅡ these wants were satisfied for a great majority of Americans. Then a third level appeared. It included such items as automobiles and new houses. By 1957 or 1958 this third level of wants was fairly well satisfied. Then, in the late 1950s a fourth level of wants appeared: the 'life-enriching' level. While other levels involve physical satisfaction-the feeding, comfort, safety, and transportation of the human body-this level stresses mental needs for recognition, achievement, and happiness. It includes a variety of goods and services, many of which could be called 'luxury' items. Among them are vacation trips, the best medical and dental care, and entertainment. Also included here are fancy foods and the latest styles in clothing. On the fourth level, a greater percentage of consumer spending goes to services, while on the first three levels more is spent on goods. Will consumers raise their sights to a fifth level of wants as their income increases, or will they continue to demand luxuries and personal services on the fourth level? A fifth level probably would involve wants that can be achieved best by community action. Consumers may be spending more on taxes to pay for government action against disease, ignorance, crime, and prejudice. After filling our stomachs, our clothes closets(衣橱), our garages, our teeth, and our minds, we now may seek to ensure the health, safety, and leisure to enjoy more fully the good things on the first four levels.According to the passage, man will begin to think about such needs as housing and clothing only when ______.A．he has saved up enough moneyB．he has grown dissatisfied with his simple shelterC．he has satisfied his hungerD．he has learned to build houses 点击查看答案