题目内容
Set 3THE SENSE OF SMELL1.Smell 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 hard-wired 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.2.The olfactory system detects 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.3.When 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 diffuse 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.4.The limbic system of the brain integrates 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.5.Scent 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 crayons can instantly transport us to our second-grade classroom, or the scent of freshly mown grass can flood us with the joy of summer freedom. What we see and hear may fade quickly in short-term memory, but what we smell is sent directly to long-term memory.6.Smells 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 found that the smell of spiced apples could reduce blood pressure and avert a panic attack in people under stress.Glossary:nostalgic: causing a desire for things, persons, or situations of the past; causing homesicknessretention: the act of retaining; keeping, holding, or maintaining What can be inferred from paragraph 6 about learning ？（）
查看答案
搜索结果不匹配？点我反馈
更多问题
Some people like to cook their own meals at home. Others prefer to eat in a restaurant or a cafeteria.Which do you prefer and why Include details and examples in your explanation.
Set 5THE DOMESTICATION OF ANIMALS1.The domestication of wild species led directly to denser human populations by yielding more food than the hunter-gatherer lifestyle could provide. In societies that possessed domestic animals, livestock helped to feed more people by providing meat, milk, and fertilizer, and by pulling plows. Large domestic animals became the societies’ main source of animal protein, replacing wild game, and they also furnished wool, leather, and land transport. Humans have domesticated only a few species of large animals, with "large" defined as those weighing over 100 pounds (45 kilograms). Fourteen such species were domesticated before the twentieth century, all of them terrestrial mammals and herbivores. The five most important of these are sheep, goats, pigs, horses, and cattle or oxen.2.Small animals such as ducks, geese, rabbits, dogs, cats, mink, bees, and silkworms have also been domesticated. Many of these small animals provided food, clothing, or warmth. However, none of them pulled plows or wagons, none carried riders, and none except dogs pulled sleds. Furthermore, no small domestic animals have been as important for food as have large domestic animals.3.Early herding societies quickly domesticated all large mammal species that were suitable for domestication. There is archaeological evidence that these species were domesticated between 10,000 and 4,500 years ago, within the first few thousand years of the origins of farming-herding societies after the last Ice Age. The continent of Eurasia has been the primary site of large mammal domestication. Having the most species of wild mammals to begin with, and losing the fewest to extinction in the last 40,000 years, Eurasia has generated the most candidates for domestication.4.Domestication involves transforming wild animals into something more useful to humans. Truly domesticated animals differ in many ways from their wild ancestors. These differences result from two processes: human selection of individual animals that are more useful to humans than other individuals of the same species, and evolutionary responses of animals to the forces of natural selection operating in human environments rather than in wild environments.5.To be domesticated, a wild species must possess several characteristics. A candidate for domestication must be primarily a herbivore because it takes less plant biomass to feed a plant eater than it does to feed a carnivore that consumes plant eaters. No carnivorous mammal has ever been domesticated for food simply because it would be too costly. A candidate must not only weigh an average of over 100 pounds but also grow quickly. That eliminates gorillas and elephants, even though they are herbivores. Moreover, candidates for domestication must be able to breed successfully in captivity.6.Since almost any sufficiently large mammal species is capable of killing a human, certain qualities disqualify a wild animal for domestication. The animal cannot have a disposition that is nasty, dangerous, or unpredictable—characteristics that eliminate bears, African buffaloes, and some species of wild horses. The animal cannot be so nervous that it panics around humans. Large herbivorous mammal species react to danger from predators or humans in different ways. Some species are nervous, fast, and programmed for instant flight when they perceive danger. Others are less nervous, seek protection in herds, and do not run until necessary. Most species of deer and antelope are of the former type, while sheep and goats are of the latter.7.Almost all domesticated large mammals are species whose wild ancestors share three social characteristics: living in a herd, maintaining a dominance hierarchy in the herd, and having herds that occupy overlapping home ranges instead of mutually exclusive territories. Humans have taken advantage of these characteristics in keeping domestic animals together with others of their species and in close proximity to other species of domestic animals.Glossary:terrestrial: living on land rather than in waterherbivores: animals that feed mainly on plants Read the first sentence of a summary of the passage. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth 2 points.Answer ChoicesA．The most important domestic animals are large herbivorous mammals that live in herds.B．Ducks,geese,rabbits,dogs,cats,and many other small animals have been domesticated.C．Although herbivores eat mainly plant matter,some species occasionally eat small animals.D．Humans quickly domesticated all large mammal species that were suitable for domestication.E．Animals must have several essential characteristics in order to be domesticated successfully.F．Large herbivorous mammals respond in various ways when threatened by predators.The domestication of animals provided humans with food, clothing, and other benefits.·____________________________________________________________·____________________________________________________________·____________________________________________________________
资源类型决定了物流企业通过何种方式为客户提供物流服务。( )
Set 2POLITICAL SYSTEMS OF THE TWENTIETH CENTURY1.Monarchy is a form of government in which authority is held by a single person, a monarch, whose right to rule is generally hereditary and lifelong. At the start of the twentieth century, monarchs ruled over most of the world, but by the middle of the century, only a handful remained. A series of revolutions in the preceding centuries had weakened the European monarchies, and while monarchs remained symbols of national unity, real power had passed to constitutional assemblies. Monarchy survived as a form in Europe only where the king or queen functioned as the symbolic head of a parliamentary state, as in Britain, the Low Countries, and Scandinavia. It lasted longer in the few small states of Asia and Africa that had never come under direct colonial rule. By the 1960s, autocratic monarchy had become an outdated form of government. Throughout most of the world, people were considered citizens, not subjects, and the totality of the people were seen as constituting the state.2.In most states where monarchical authority was removed, some form of liberal democracy took its place. A liberal democracy is a state where political authority rests in the people acting through elected representatives and where an elected executive is responsible to the will of the people as a whole. The term applies to a broad group of states with a parliamentary or representative political tradition. Liberal democracies differ from the communist states known as people’s democracies, in which the Communist party holds the ultimate authority. Generally, liberal democracies follow the parliamentary pattern, with the executive power vested in a cabinet responsible to the parliament and drawn from the majority party or combination of parties. In the United States, an independently elected executive, the president, functions separately from the legislative authority, the congress.3.The doctrine that all of the people had effective authority, or sovereignty, became the basis for the functioning of democratic states. This doctrine of popular sovereignty became all-inclusive as citizenship rights were extended to classes formerly excluded and to women. The liberal democratic state claimed the right to control every aspect of human life according to the will of the people, except where limits on state control were directly stated in a bill of rights in a democratic constitution and recognized in practice.4.All democratic states, both parliamentary and presidential, changed in form during the twentieth century. To meet the needs of an urban industrial society, states generally enlarged their scope of activity to control economic power and to provide common services to the people. The expansion of state activity and extension of state services involved a new view of legislation and its role in society. The passing of laws came to be seen as a way to promote the well being of the people. With this new concept of legislation, the number of new laws increased immensely, particularly in the areas of social welfare, education, health and safety, and economic development.5.The trend toward liberal democracy continued throughout the century, but at various times there was also a tendency toward a revival of authoritarian rule. In a number of states, democratic governments could not cope with the crises of the time. In these cases, some form of totalitarian dictatorship emerged, replacing popular sovereignty with the total power of the state. In some instances, monarchy gave way directly to dictatorship. In others, dictatorial regimes took over democratically organized states, notably in Eastern Europe in the years between the two world wars, in new states of Asia and Africa in the 1950s, and sporadically in Central and South America.6.Authoritarian governments showed three principle characteristics. First, there was a head of state or leader with exceptional powers, with a party to support him. Second, the legislative body was elected by a system that prohibited parties opposed to the regime, and third, there was a bureaucratic administration that was in no way subject to popular control. The most extreme position on these points was taken by Hitler’s totalitarian National Socialist State in the 1930s.Glossary:autocratic: characterized by unlimited powerautocratic: characterized by complete obedience to authority, lacking individual freedom It can be inferred from the passage that the author most likely believes which of the following statements about political systems in the twentieth century ？（）
微信支付 
支付宝支付