THE、SENSE、OF SMELL 1Smell is the most direct of all the senses. It is thought to be the oldest sense in terms of human evolution, which may explain why smell is {{U}}hard-wired{{/U}} into the brain. The olfactory nerve, which manages the perception of smells, is essentially an extension of the brain. The olfactory nerve provides a direct link from receptors at the top of the nose to the portion of the brain that controls memory, emotion, and behavior. 2The olfactory system {{U}}detects{{/U}} certain airborne chemicals that enter the nose and then transmits this chemical information to the limbic system in the brain. The olfactory region at the upper end of each nostril is yellow, moist, and full of fatty substances. The shade of yellow indicates the strength of the sense of smell: the deeper the shade, the keener and more acute it is.Animals have a very strong sense of smell, so their olfactory regions are dark yellow to reddish brown, while those of humans are light yellow. 3When an odorous substance enters the nose, it binds to olfactory receptor cells, the neurons lining the yellow upper portion of the nasal cavity. Olfactory receptor cells contain microscopic hairs called cilia that extend into the layer of mucus coating the inside of the nose. Odor molecules {{U}}diffuse{{/U}} into this region and are absorbed by the cilia of the olfactory receptor cells. What this means is that when we hold a rose to our nose and inhale, odor molecules float up into the nasal cavity, where they are absorbed by five million olfactory receptor cells. The receptor cells alert the olfactory nerve, which sends impulses to the brain’s olfactory bulb, or smell center. Thus, olfactory information about the rose enters the brain’s limbic system, where, in most of us, it stimulates a feeling of pleasure. 4The limbic system of the brain {{U}}integrates{{/U}} memory, emotion, and behavior. The system is composed of a group of related nervous system structures that are the functional center of emotions such as anger, fear, pleasure, and sadness. The components of the limbic system are linked to the cerebral cortex, the part of the brain involved in complex learning, reasoning, and personality. The cerebral cortex makes decisions about the emotional content of these unique human qualities after "consulting" the limbic system and other brain centers in processing and retrieving memories. It may, in turn, use memories to modify behavior. 5Scent may be the strongest trigger of memory and emotions. When we inhale a scent, receptors in the brain’s limbic center compare the odor entering our nose to odors stored in our memory.Along the way, memories associated with those odors are stimulateD、A、smell can be overwhelmingly nostalgic because it triggers powerful images and emotions. The waxy fragrance of {{U}}crayons{{/U}} can instantly transport us to our second-grade classroom, or the scent of {{U}}freshly mown grass{{/U}} can flood us with the joy of summer freedom. {{U}}What we see and hear may fade quickly in short-term memory, but what we smell is sent directly to long-term memory. {{/U}} 6Smells can increase alertness and stimulate learning and retention. In one study, children memorized a word list, which was presented both with and without accompanying scents. The children recalled words on the list more easily and with higher accuracy when the list was given with scents than without, showing the link between smell and the ability to retain information. In another study, researchers examined how various smells can increase alertness and decrease stress. They found that the scent of lavender could wake up the metabolism and make people more alert. They also foReading5"SpeechandWriting"Itisawidelyhel Reading 5 "Speech and Writing" It is a widely held misconception that writing is more perfect than speech. To many people, writing somehow seems more correct and more stable, whereas speech can be careless, corrupted, and susceptible to change. Some people even go so far as to identify language with writing and to regard speech as a secondary form of language used imperfectly to approximate the ideals of the written language. → One of the basic assumptions of modern linguistics, however, is that speech is primary and writing is secondary. The most immediate manifestation of language is speech and not writing. Writing is simply the representation of speech in another physical medium. Spoken language encodes thought into a physically transmittable form, while writing, in turn, encodes spoken language into a physically preservable form. Writing is a two-stage process.All units of writing, whether letters or characters, are based on units of speech, i.e., words, sounds, or syllables. When linguists study language, they take the spoken language as their best source of data and their object of description (except in instances of languages like Latin for which there are no longer any speakers). There are several reasons for maintaining that speech is primary and writing is secondary.
First, writing is a later historical development than spoken language.
Current archeological evidence indicates that writing was first utilized in Sumer, that is, modern-day Iraq, about 6,000 years ago.
As far as physical and cultural anthropologists can tell, spoken language has probably been used by humans for hundreds of thousands of years.
 → Second, writing does not exist everywhere that spoken language exists. This seems hard to imagine in our highly literate society, but the fact is that there are still many communities in the world where a written form of language is not used, and even in those cultures using a writing system, there are individuals who fail to learn the written form of their language. In fact, the majority of theEarth’s inhabitants are illiterate, though quite capable of spoken communication. However, no society uses only a written language with no spoken form. Third, writing must be taught, whereas spoken language is acquired automatically.All children, except children with serious learning disabilities, naturally learn to speak the language of the community in which they are brought up. They acquire the basics of their native language before they enter school, and even if they never attend school, they become fully competent speakers. Writing systems vary in complexity, but regardless of their level of sophistication, they must all be taught. Finally, neurolinguistic evidence (studies of the brain in action during language use) demonstrates that the processing and production of written language is overlaid on the spoken language centers in the brain. Spoken language involves several distinct areas of the brain; writing uses these areas and others as well. → So what gives rise to the misconception that writing is more perfect than speech There are several reasons. For one thing, the product of writing is usually more aptly worded and better organized, containing fewer errors, hesitations, and incomplete sentences than are found in speech. This perfection of writing can be explained by the fact that writing is the result of deliberation, correction, and revision, while speech is the spontaneous and simultaneous formulation of ideas; writing is therefore less subject to the constraint of time than speech is. In addition, writing is ultimately associated with education and edu Duringthe1850’,reformmovements_____tempe During the 1850’, reform movements _____temperance and the abolition of slavery gained strength in the United States. A、advocating B.they had advocated C.to advocating D.to advocate when
BecausethelowlatitudesoftheEarth,thearea Because the low latitudes of theEarth, the areas near the equator, receive more heat Than the latitudes near the poles, and because the nature of heat is to expand and move, Heat is transported from the tropics to the middle and high latitudes. Some of this heat isMoved by winds and some by ocean currents, and some gets stored in the atmosphere in(5) the form of latent heat. The term "latent heat" refers to the energy that has to be used to Convert liquid water to water vapor. We know that if we warm a pan of water on a stove, it will evaporate, or turn into vapor, faster than if it is allowed to sit at room temperature. We also know that if we hang wet clothes outside in the summertime they will dry faster than in winter, when temperatures are colder. The energy used in both cases to change (10) liquid water to water vapor is supplied by heat―supplied by the stove in the first case and by the Sun in the latter case. This energy is not lost. It is stored in water vapor in the atmosphere as latent heat.Eventually, the water stored as vapor in the atmosphere will condense to liquid again, and the energy will be released to the atmosphere. In the atmosphere, a large portion of the Sun’’s incoming energy is used to evaporate (15) Water, primarily in the tropical oceans. Scientists have tried to quantify this proportion of the Sun’’s energy.By analyzing temperature, water vapor, and wind data around the globe, they have estimated the quantity to be about 90 watts per square meter, or nearly 30 percent of the Sun’’s energy. Once this latent heat is stored within the atmosphere, it can be transported, primarily to higher latitudes, by prevailing, large-scale winds. Or it (20) can be transported vertically to higher levels in the atmosphere, where it forms clouds and subsequent storms, which then release the energy back to the atmosphere.The word "convert" line 6 is closest in meaning to A、mix B.change
C、adapt D.reduce
Nineteenth-CenturyPoliticsintheUnitedSta Nineteenth-Century Politics in the United States The development of the modem presidency in the United States began withAndrew Jackson who swept to power in 1829 at the head of theDemocratic Party and served until 1837.During his administration he immeasurably enlarged the power of the presidency. "The President is the direct representative of theAmerican people," he lectured the Senate when it opposed him. "He was elected by the people, and is responsible to them. " With this declaration, Jackson redefined the character of the presidential office and its relationship to the people. During Jackson’s second term, his opponents had gradually come together to form the Whig party.
Whigs andDemocrats held different attitudes toward the changes brought about by the market, banks, and commerce.
TheDemocrats tended to view society as a continuing conflict between "the people" --farmers, planters, and workers--and a set of greedy aristocrats.
This "paper money aristocracy" of bankers and investors manipulated the banking system for their own profit,Democrats claimed, and sapped the nation’s virtue by encouraging speculation and the desire for sudden, unearned wealth.
TheDemocrats wanted the rewards of the market without sacrificing the features of a simple agrarian republiC、They wanted the wealth that the market offered without the competitive, changing society; the complex dealing; the dominance of urban centers; and the loss of independence that came with it. Whigs, on the other hand, were more comfortable with the market. For them, commerce and economic development were agents of civilization. Nor did the Whigs envision any conflict in society between farmers and workers on the one hand and businesspeople and bankers on the other.Economic growth would benefit everyone by raising national income and expanding opportunity. The government’s responsibility was to provide a well-- regulated economy that guaranteed opportunity for citizens of ability. Whigs andDemocrats differed not only in their attitudes toward the market but also about how active the central government should be in people’s lives.DespiteAndrew Jackson’s inclination to be a strong President,Democrats as a rule believed in limited government. Government’s role in the economy was to promote competition by destroying monopolies and special privileges. In keeping with this philosophy of limited government,Democrats also rejected the idea that moral beliefs were the proper sphere of government action. Religion and politics, they believed, should be kept clearly separate, and they generally opposed humanitarian legislation. The Whigs, in contrast, viewed government power positively. They believed that it should be used to protect individual rights and public liberty, and that it had a special role where individual effort was in-effective.By regulating the economy and competition, the government could ensure equal opportunity. Indeed, for Whigs the concept of government promoting the general welfare went beyond the economy. In particular, Whigs in the northern sections of the United States also believed that government power should be used to foster the moral welfare of the country. They were much more likely to favor social reform legislation and aid to education. In some ways the social makeup of the two parties was similar. To be competitive in winning votes, Whigs andDemocrats both had to have significant support among farmers, the largest group in society, and workers. Neither party could win an election by appealing exclusively to the rich or the poor. The Whigs, however, enjoye
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