最牛英语口语培训模式：躺在家里练口语，全程外教一对一，三个月畅谈无阻！
洛基英语，免费体验全部在线一对一课程：https://www.doczj.com/doc/6c410228.html,/ielts/xd.html（报名网址）Rainforests
Tropical rainforests are the most diverse ecosystem(生态系统)on Earth，and also the oldest. Today, tropical rainforests cover only 6 percent of the Earth’s ground surface，but they are home to over half of the planet’s plant and animal species.
What Is a Rainforest?
Generally speaking，a rainforest is an receives high rainfall and is dominated by tall trees. A wide range of ecosystems fall into this category, of course. But most of the time when people talk about rainforests, they mean the tropical rainforests located near the equator.
These forests receive between 160 and 400 inches of rain per year. The total annual rainfall is spread pretty evenly throughout the year, and the temperature rarely dips below 60 degrees Fahrenheit.
This steady climate is due to the position of rainforests on the globe. Because of the orientation of the Earth’s axis, the Northern and Southern hemispheres each spend part of the year tilted away from the sun. Since rainforests are at the middle of the globe, located near the equator, they are not especially affected by this change. They receive nearly the same amount of sunlight，and therefore heat, all year. Consequently, the weather remains fairly constant.
The consistently wet, warm weather and ample sunlight give plant life everything it needs to thrive. Trees have the resources to grow to tremendous heights. and they live for hundreds, even thousands, of years. These giants，which reach 60 to 150 ft in the air, form the basic structure of the rainforest. Their top branches spread wide in order to capture maximum sunlight. This creates a thick canopy(树冠)level at the top of the forest, with thinner greenery levels underneath. Some large trees grow so tall that they even tower over the canopy layer.
As you go lower, down into the rainforest, you find less and less greenery. The forest floor is made up of moss，fungi，and decaying plant matter that has fallen from the upper layers. The reason for this decrease in greenery is very simple：The overabundance of plants gathering sunlight at the top of the forest blocks most sunlight from reaching the bottom of the forest，making it difficult for robust plants to thrive.
The Forest for the Trees
The ample sunlight and extremely wet climate of many tropical areas encourage the growth of towering trees with wide canopies. This thick top layer of the rainforest dictates the lives of all other plants in the forest. New tree seedlings rarely survive to make it to the top unless some older trees die, creating a“hole”in the canopy. When this happens，all of the seedlings on the ground level compete intensely to reach the sunlight.
Many plant species reach the top of the forest by climbing the tall trees. It is much easier to ascend this way, because the plant doesn’t have to form its own supporting
structure.
Some plant species，called epiphytes, grow directly on the surface of the giant trees. These plants，which include a variety of orchids and ferns，make up much of the understory, the layer of the rainforest right below the canopy. Epiphytes are close enough to the top to receive adequate light，and the runoff from the canopy layer provides all the water and nutrients(养分)they need, which is important since they don’t have access to the nutrients in the ground.
Stranglers and Buttresses
Some epiphytes eventually develop into stranglers. They grow long, thick roots that extend down the tree trunk into the ground. As they continue to grow, the roots form a sort of web structure all around the tree. At the same time, the strangler plant’s branches extend upward，spreading out into the canopy. Eventually, the strangler may block so much light from above，and absorb such a high percentage of nutrients from the ground below, that the host tree dies.
Competition over nutrients is almost as intense as competition for light. The excessive rainfall rapidly dissolves nutrients in the soil, making it relatively infertile except at the top layers. For this reason，rainforest tree roots grow outward to cover a wider area, rather than downward to lower levels. This makes rainforest trees somewhat unstable, since they don’t have very strong anchors in the ground. Some trees compensate for this by growing natural buttresses. These buttresses are basically tree trunks that extend out from the side of the tree and down to the ground, giving the tree additional support.
Rainforest trees are dependent on bacteria that are continually producing nutrients in the ground. Rainforest bacteria and trees have a very close，symbiotic(共生的) relationship. The trees provide the bacteria with food, in the form of fallen leaves and other material, and the bacteria break this material down into the nutrients that the trees need to survive.
One of the most remarkable things about rainforest plant life is its diversity. The temperate rainforests of the Pacific Northwest are mainly composed of a dozen or so tree species. A tropical rainforest, on the other hand, might have 300 distinct tree species.
All Creatures, Great and Small
Rainforests are home to the majority of animal species in the world. And a great number of species who now live in other environments, including humans, originally inhabited the rainforests. Researchers estimate that in a large rainforest area, there may be more than 10 million different animal species.
Most of these species have adapted for life in the upper levels of the rainforest, where food is most plentiful. Insects, which can easily climb or fly from tree to tree, make up the largest group(ants are the most abundant animal in the rainforest).Insect species have a highly symbiotic relationship with the plant life in a rainforest. The insects move from plant to plant, enjoying the wealth of food provided there. As they travel, the insects may pick up the plants’ seeds, dropping them some distance away. This helps to disperse the population of the plant species over a larger area. The numerous birds of the rainforest also play a major part in seed dispersal. When
they eat fruit from a plant, the seeds pass through their digestive system. By the time they excrete(排泄)the seeds, the birds may have flown many miles away from the fruit-bearing tree.
There are also a large number of reptiles and mammals in the rainforest. Since the weather is so hot and humid during the day, most rainforest mammals are active only at night，dusk or dawn. The many rainforest bat species are especially well adapted for this lifestyle. Using their sonar, bats navigate easily through the mass of trees in the rainforest, feeding on insects and fruit.
While most rainforest species spend their lives in the trees，there is also a lot of life on the forest floor. Great apes, wild pigs, big cats and even elephants can all be found in rainforests. There are a number of people who live in the rainforests, as well. These tribes—which, up until recently, numbered in the thousands—are being forced out of the rainforests at an alarming rate because of deforestation.
Deforestation
In the past hundred years，humans have begun destroying rainforests at an alarming rate. Today, roughly 1.5 acres of rainforest are destroyed every second. People are cutting down the rainforests in pursuit of three major resources：
Land for crops?
Lumber for paper and other wood products?
Land for livestock pastures?
In the current economy, people obviously have a need for all of these resources. But almost all experts agree that, over time, we will suffer much more from the destruction of the rainforests than we will benefit.
The world’s rainforests are an extremely valuable natural resource，to be sure, but not for their lumber or their land. They are the main cradle of life on Earth，and they hold millions of unique life forms that we have yet to discover. Destroying the rainforests is comparable to destroying an unknown planet—we have no idea what we’re losing. If deforestation continues at its current rate，the world’s tropical rainforests will be wiped out within 40 years.
1. Virtually all plant and animal species on Earth can be found in tropical rainforests.
2. There is not much change in the weather in the tropical rainforests all the year round.
3. The largest number of rainforests in the world are located on the African continent.
4. Below the canopy level of a tropical rainforest grows an overabundance of plants.
5. New tree seedlings will not survive to reach the canopy level unless .
6. Epiphytes，which form much of the understory of the rainforest, get all their water and nutrients from .
7. Stranglers are so called because they by blocking the sunlight and competing for the nutrients.
8. Since rainforest bacteria and trees depend on each other for life, the relationship they form is termed______ .
9. Plant species are dispersed over a large area with the help of______.
10. As we are still ignorant of millions of unique life forms in the rainforest, deforestation can be compared to the destruction of______.
答案：1. N 2. Y 3. NG 4. N
5. some older trees die
6. the canopy layer
7. kill the host tree
8. symbiotic
9. insects and birds／insects／birds／animals
10. an unknown planet
“成千上万人疯狂下载。。。。。。
更多价值连城的绝密英语学习资料，
洛基内部秘密英语，技巧，策略
请在网上申请报名”
大学英语六级阅读理解专题训练 2016年下半年英语四六级迫在眉睫，同学们准备得如何了?下面是网提供给大家关于大学阅读理解专题训练，希望对大家的备考有所帮助。 What is it about Americans and food? We love to eat, but we feel 1 about it afterward. We say we want only the best, but we strangely enjoy junk food. We’re 2 with health and weight loss but face an unprecedented epidemic of obesity(肥胖). Perhaps the 3 to this ambivalence(矛盾情结) lies in our history. The first Europeans came to this continent searching for new spices but went in vain. The first cash crop(经济作物) wasn’t eaten but smoked. Then there was Prohibition, intended to prohibit drinking but actually encouraging more 4 ways of doing it. The immigrant experience, too, has been one of inharmony. Do as Romans do means eating what “real Americans” eat, but our nation’s food has come to be 5 by imports—pizza, say, or hot dogs. And some of the country’s most treasured cooking comes from people who arrived here in shackles. Perhaps it should come as no surprise then that food has been a medium for the nation’s defining struggles, whether at the Boston Tea Party or the sit ins at southern lunch counters. It is integral to our concepts of health and even morality whether one refrains from alcohol for religious reasons or evades meat for political 6 . But strong opinions have not brought 7 . Americans are ambivalent about what they put in their mouths. We have become 8 of our foods, especially as we learn more about what they contain. The 9 in food is still prosperous in the American consciousness. It’s no coincidence, then, that the first Thanksgiving holds the American imagination in such bondage(束缚). It’s w hat we eat—and how we 10 it with friends, family, and strangers—that help define America as a community today. A. answer I. creative B. result J. belief C. share K. suspicious D. guilty L. certainty E. constant M. obsessed F. defined N. identify
2020 年大学英语六级考试阅读冲刺模拟训练 (3) Scholars and students have always been great travelers. The official case for “academic mobility ” is now often stated in impressive terms as a fundamental necessity for economic and social progress in the world, and debated in the corridors of Europe, but it is certainly nothing new. Serious students were always ready to go abroad in search of the most stimulating teachers and the most famous academies; in search of the purest philosophy, the most effective medicine, the likeliest road to gold. Mobility of this kind meant also mobility of ideas, their transference across frontiers, their simultaneous impact upon many groups of people. The point of learning is to share it, whether with students or with colleagues; one presumes that only eccentrics have no interest in being credited with a starling discovery, or a new technique. It must also have been reassuring to know that other people in other parts of the world were about to make the same discovery or were thinking along the same lines, and that one was not quite alone, confronted by inquisition, ridicule or neglect. In the twentieth century, and particularly in the last 20 years, the old footpaths of the wandering scholars have become vast highways. The vehicle which has made this possible has of course been the aeroplane, making contact between scholars even in the most distant places immediately feasible, and providing for the very rapid transmission of knowledge.
[外语类试卷]大学英语六级改革适用（阅读）模拟试卷22 Section B 0 Graying Population Stays in the Pink A)Elderly people are growing healthier, happier and more independent, say American scientists. The results of a 14-year study to be announced later this month reveal that the diseases associated with old age are afflicting fewer and fewer people and when they do strike, it is much later in life. B)In the last 14 years, the National Long-term Health Care Survey has gathered data on the health and lifestyles of more than 20,000 men and women over 65. Researchers, now analysing the results of data gathered in 1994, say arthritis, high blood pressure and circulation problems—the major medical complaints in this age group are troubling a smaller proportion every year. And the data confirms that the rate at which these diseases are declining continues to accelerate. Other diseases of old age— dementia, stroke, arteriosclerosis and emphysema—are also troubling fewer and fewer people. C)"It really raises the question of what should he considered normal ageing", says Kenneth Manton, a demographer from Duke University in North Carolina. He says the problems doctors accepted as normal in a 65-year-old in 1982 are often not appearing until people are 70 or 75. D)Clearly, certain diseases are beating a retreat in the face of medical advances. But there may be other contributing factors. Improvements in childhood nutrition in the first quarter of the twentieth century, for example, gave today's elderly people a better start in life than their predecessors. E)On the downside, the data also reveals failures in public health that have caused surges in some illnesses. An increase in some cancers and bronchitis may reflect changing smoking habits and poorer air quality, say the researchers. "These may be subtle influences", says Manton, "but our subjects have been exposed to worse and worse pollution for over 60 years. It' s not surprising we see some effect". F)One interesting correlation Manton uncovered is that better-educated people are likely to live longer. For example, 65-year-old women with fewer than eight years of schooling are expected, on average, to live to 82. Those who continued their education live an extra seven years. Although some of this can be attributed to a higher income, Manton believes it is mainly because educated people seek more medical attention. G)The survey also assessed how independent people over 65 were, and again found a striking trend. Almost 80% of those in the 1994 survey could complete everyday activities ranging from eating and dressing unaided to complex tasks such as cooking and managing their finances.
英语六级阅读理解模拟练习及答案详解 导读：我根据大家的需要整理了一份关于《英语六级阅读理解模拟练习及答案详解》的内容，具体内容：在英语学习过程中，阅读理解能力是学习者发展语言能力的基础和手段。国内的各类英语考试中几乎都有阅读理解题型，大学英语六级考试也不例外。大学英语六级阅读试题是试卷中分值最重的题型，为了提高大... 在英语学习过程中，阅读理解能力是学习者发展语言能力的基础和手段。国内的各类英语考试中几乎都有阅读理解题型，大学英语六级考试也不例外。大学英语六级阅读试题是试卷中分值最重的题型，为了提高大家的阅读水平，下面是我为大家带来英语六级阅读理解模拟练习，希望对大家的学习有所帮助! 英语六级阅读理解模拟练习：能源问题 It is often claimed that nuclear energy is something we cannot do without. We live in a consumer society where there is an enormous demand for commercial products of all kinds. Moreover. an increase in industrial production is considered to be one solution to the problem of mass unemployment. Such an increase presumes an abundant and cheap energy supply. Many people believe that nuclear energy provides an inexhaustible and economical source of power and chat it is therefore essential for an industrially developing society. There are a number of other advantages in the use of nuclear energy.
2017年英语六级阅读模拟试题 It would be all too easy to say that Facebook's market meltdown is coming to an end. Afterall, Mark Zuckerberg's social network burned as much as $ 50 billion of shareholders' wealth injust a couple months. To put that in context, since its debut(初次登台) on NASDAQ in May,Facebook has lost value nearly equal to Yahoo, AOL, Zynga, Yelp, Pandora, OpenTable,Groupon, LinkedIn, and Angie's List combined, plus that of the bulk of the publicly tradednewspaper industry: As shocking as this utter failure may be to the nearly 1 billion faithful Facebook usersaround the world, it's no surprise to anyone who read the initial public offering (IPO)prospectus (首次公开募股说明书). Worse still, all the crises that emerged when the companydebuted-overpriced shares, poor corporate governance, huge challenges to the core business,and a damaged brand-remain today. Facebook looks like a prime example of what Wall Streetcalls a falling knife-that is, one that can cost investors their fingers if they try to catch it. Start with the valuation(估值). To justify a stock price close to the lower end of theprojected range in the IPO, say $ 28 a share, Facebook's future growth would have needed tomatch that of Google seven years earlier. That would have required increasing revenue by some80 percent annually and maintaining high profit margins all the while. That's not happening. In the first half of 2012, Facebook reported revenue of $ 2.24 billion, up38 percent from the same period in 2011. At the same time, the company's costs surged to $ 2.6 billion in the six-month period. This so-so performance reflects the Achilles' heel of Facebook's business model, which thecompany clearly stated in a list of risk factors associated with its IPO: it hasn't yet figured outhow to advertise
2014年12月大学英语六级考试备考资料《阅读理解》考前训练（21-30）及答案 考前训练(21) How to Deal With Difficult People In New York City one day, a businesswoman got into a taxi. Because it was rush hour and she was hurrying for a train, she suggested a route. "I've been a cabby(车夫) for 15 years!" the driver yelled. "You think I don't know the best way to go?" The woman tried to explain that she hadn't meant to offend him, but the driver kept yelling. She finally realized he was too upset to be reasonable. So she did the unexpected. "You know, you're right," she told him. "It must seem dumb for me to assume you don't know the best way through the city. " Taken aback, the driver flashed his rider a confused look in the rear-view mirror, turned down the street she wanted and got her to the train on time. "He didn't say another word the rest of the ride," she said, "until I got out and paid him. Then he thanked me. " When you encounter people like this cab driver, there's an irresistible urge to dig in your heels. This can lead to prolonged arguments, soured friendships, lost career opportunities and broken marriages. As a clinical psychiatrist, I've discovered one simple but extremely unlikely principle that can prevent virtually any conflict or other difficult situation from becoming a recipe for disaster. The key is to put yourself in the other person's shoes and look for the truth in what that person is saying. Find a way to agree. The result may surprise you. Sulkers Steve's 14-year-old son, Adam, had been irritable for several days. When Steve asked why, Adam snapped, "Nothing's wrong! Leave me alone!" and stalked off to his room. We all know people like this. When there's problem, they may sulk(生闷气) or act angry and refuse to talk. So what's the solution? First, Steve needs to ask himself why Adam won't talk. Maybe the boy is worried about something that happened at school. Or he might be
大学英语六级阅读模拟试题及答案 第一篇 A scientific panel convened by the World Health Organization recommended guidelines on Friday for doctors conducting clinical studies of SARS patients. The panel urged doctors to apply the guidelines in analyzing the masses of potentially useful information about various therapies that were collected in this year’s epidemic. Much of that information has not been published or analyzed. “It is a matter of urgency to get better analysis and review,” said Dr. Simon Mardel, a WHO official who led the two-day meeting that ended on Friday. He said thousands of potential therapies and compounds had been tested so far as researchers try to determine treatments for SARS, or severe acute respiratory syndrome. “We recognize that having no treatment for SARS is hindering our ability to control an epidemic in so many ways.” He said. In the epidemic earlier this year, various treatments, like drugs to fight the virus or strengthen the immune system, as well as traditional Chinese medicine, were delivered under emergency conditions, in widely different settings and countries to patients suffering from varying stages of the illness. Those conditions—generally without standardized measurements or controlled situations—have made it hard to interpret results. Standard supportive therapy like nursing, and in severe cases the use of mechanical respirators（呼吸器）to help patients breathe, is the mainstay（主要支持）of SARS care, and helped many patients survive. But doctors still do not know how best to treat SARS patients who have breathing difficulties. Dr. Mardel said. One method is invasive ventilation. A second method involves blowing oxygen into the lungs through a mask. Both carry the risk of transmitting the virus to hospital employees. Without proper analysis, the panel was unable to say definitively which treatment worked best, or which caused the most harm. “There is a lack of shared information,” Dr. Mardel said, noting that a lot of data have not been published. The panel also agreed on guidelines that would allow doctors to conduct quick and safe clinical trials, a process that generally takes years to complete. The world Health Organization, a United Nations agency did not release the guidelines. Dr. Mardel said they were flexible because no one knew where, when and in what setting SARS would return. Experts in many countries have already listed the treatments they want to test, and the health agency is leaving these decisions to individual nations. 1. Guidelines recommended by the scientific panel can be used for _____. A. gathering potentially useful information about various therapies collected B. conducting clinical studies of SARS patients C. determining treatment for SARS D. publishing all the information about SARS
Reading Comprehension for CET 6 Passage 1 In the 1962 movie Lawrence of Arabia,one scene shows an American newspaper reporter eagerly snapping photos of men looting a sabotaged train.One of the looters,Chief Auda abu Tayi of the Howeitat clan,suddenly notices the camera and snatches it.Am I in this?he asks,before smashing it open.To the dismayed reporter,Lawrence explains,He thinks these things will steal his virtue.He thinks you're a kind of thief. As soon as colonizers and explorers began taking cameras into distant lands,stories began circulating about how indigenous peoples saw them as tools for black magic.The ignorant natives may have had a point.When photography first became available,scientists welcomed it as a more objective way of recording faraway societies than early travelers' exaggerated accounts.But in some ways,anthropological photographs reveal more about the culture that holds the camera than the one that stares back.Up into the 1950s and 1960s,many ethnographers sought pure pictures of primitive cultures,routinely deleting modern accoutrements such as clocks and Western dress.They paid men and women to re-enact rituals or to pose as members of war or hunting parties,often with little regard for veracity.Edward Curtis,the legendary photographer of North American Indians,for example,got one Makah man to pose as a whaler with a spear in 1915--even though the Makah had not hunted whales in a generation. These photographs reinforced widely accepted stereotypes that indigenous cultures were isolated,primitive,and unchanging.For instance,National Geographic magazine's photographs have taught millions of Americans about other cultures.As Catherine Lutz and Jane Collins point out in their 1993 book Reading National Geographic,the magazine since its founding in 1888 has kept a tradition of presenting beautiful photos that don't challenge white,middle-class American conventions.While dark-skinned women can be shown without tops,for example,white women's breasts are taboo.Photos that could unsettle or disturb,such as areas of the world torn asunder by war or famine,are discarded in favor of those that reassure,to conform with the society's stated pledge to present only kindly visions of foreign societies.The result,Lutz and Collins say,is the depiction of an idealized and exotic world relatively free of pain or class conflict. Lutz actually likes National Geographic a lot.She read the magazine as a child,and its lush imagery influenced her eventual choice of anthropology as a career.She just thinks that as people look at the photographs of other cultures,they should be alert to the choice of composition and images. 1.The main idea of the passage is______________. [A]Photographs taken by Western explorers reflect more Westerners’ perception of the indigenous cultures and the Western values. [B]There is a complicated relationship between the Western explorers and the primitive peoples. [C]Popular magazines such as National Geographic should show pictures of the exotic and idealized worlds to maintain high sales. [D]Anthropologists ask the natives to pose for their pictures,compromising the truthfulness of their pictures. 2.We can infer from the passage that early travelers to the native lands often_________. [A]took pictures with the natives [B]gave exaggerated accounts of the native lands
2020年6月英语六级阅读理解模拟题及答案 2020年6月英语六级阅读理解模拟题及答案 Which is safer-staying at home， traveling to work on public transport， or working in the office? Surprisingly，each of these carries the same risk， which is very low. However， what about flying compared to working in the chemical industry? Unfortunately， the former is 65 times riskier than the latter! In fact， the accident rate of workers in the chemical industry is less than that of almost any of human activity， and almost as safe as staying at home. The trouble with the chemical industry is that when things go wrong they often cause death to those living nearby. It is this which makes chemical accidents so newsworthy. Fortunately， they are extremely rare. The most famous ones happened at Texas City (1947)，Flixborough (1974)， Seveso (1976)， Pemex (1984) and Bhopal (1984)。 Some of these are always in the minds of the people even though the loss of life was small. No one died at Seveso， and only 28 workers at Flixborough. The worst accident of all was Bhopal， where up to 3，000 were killed. The Texas City explosion of fertilizer killed 552. The Pemex fire at a storage plant for natural gas in the suburbs of Mexico City took 542 lives， just a month before the unfortunate event at Bhopal. Some experts have discussed these accidents and used each accident to illustrate a particular danger. Thus the Texas City explosion was caused by tons of ammonium nitrate(硝酸铵)，which is safe unless stored in great quantity. The