Passage Two Supporters of the biotech industry have accused an American scientist of misconduct after she testified to the New Zealand government that a genetically modified(GM) bacterium could cause serious damage if released. The New Zealand Life Sciences Network, an association of pro-GM scientists and organizations, says the view expressed by Elaine Ingham, a soil biologist at Oregon State University in Corvallis, was exaggerated and irresponsible. It has asked her university to discipline her. But Ingham stands by her comments and says the complaints are an attempt to silence her. "They’re trying to cause trouble with my university and get me fired," Ingham told New Scientist. The controversy began on 1 February, when Ingham testified before New Zealand’s Royal Commission on Genetic Modification, which will determine how to regulate GM organisms. Ingham claimed that a GM version of a common soil bacterium could spread and destroy plants if released into the wild. Other researchers had previously modified the bacterium to produce alcohol from organic waste. But Ingham says that when she put it in soil with wheat plants, all of the plants died within a week.. "We would lose terrestrial(陆生的)plants... this is an organism that is potentially deadly to the continued survival of human beings," she told the commission. She added that the U. S. Environmental Protection Agency (EPA) canceled its approval for field tests using the organism once she had told them about her research in 1999. But last week the New Zealand Life Sciences Network accused Ingham of "presenting inaccurate, careless and exaggerated information" and "generating speculative doomsday scenarios (世界末日的局面)that are not scientifically supportable". They say that her study doesn’t even show that the bacteria would survive in the wild, much less kill massive numbers of plants. What’s more, the network says that contrary to Ingham’s claims, the EPA. was never asked to consider the organism for field trials. The EPA has not commented on the dispute. But an e-mail to the network from Janet Anderson, director of the EPA’s bio pesticides (生物杀虫剂)division, says "there is no record of a review and/or clearance to field test". Ingham says EPA officials had told her that the organism was approved for field tests, but says she has few details. It’s also not clear whether the organism, first engineered by a German institute for biotechnology, is still in use. Whether Ingham is right or wrong, her supporters say opponents are trying unfairly to silence her. "I think her concerns should be taken seriously. She shouldn’t be harassed in this way," says Ann Clarke, a plant biologist at the University of Guelph in Canada who also testified before the commission. "It’s an attempt to silence the opposition." Ingham insists that her testimony is based on ______.
A. evidence provided by the EPA of the United States
B. the results of an experiment she conducted herself
C. evidence from her collaborative research with German biologists
D. the results of extensive field tests in Corvallis, Oregon
Passage One As a wise man once said, we are all ultimately alone. But an increasing number of Europeans are choosing to be so at an ever earlier age. This isn’t the stuff of gloomy philosophical contemplations, hut a fact of Europe’s new economic landscape, embraced by sociologists, real- estate developers and ad executives alike. The shift away from family life to solo lifestyle, observes a French sociologist, is part of the "irresistible momentum of individualism" over the last century. The communications revolution, the shift from a business culture of stability to one of mobility and the mass entry of women into the workforce have greatly wreaked havoc on (扰乱) Europeans’ private lives. Europe’s new economic climate has largely fostered the trend toward independence. The current generation of home-aloners came of age during Europe’s shift from social democracy to the sharper, more individualistic climate of American-style capitalism. Raised in an era of privatization and increased consumer choice, today’s tech-savvy (精通技术的) workers have embraced a free market in love as well as economics. Modern Europeans are rich enough to afford to live alone, and temperamentally independent enough to want to do so. Once upon a time, people who lived alone tended to be those on either side of marriage-- twenty something professionals or widowed senior citizens. While pensioners, particularly elderly women, make up a large proportion of those living alone, the newest crop of singles are high earners in their 30s and 40s who increasingly view living alone as a lifestyle choice. Living alone was conceived to be negative dark and cold, while being together suggested warmth and light. But then came along the idea of singles. They were young, beautiful, strong! Now, young people want to live alone. The booming economy means people are working harder than ever. And that doesn’t leave much room for relationships. Pimpi Arroyo, a 35-year-old composer who lives alone in a house in Paris, says he hasn’t got time to get lonely because he has too much work. "I have deadlines which would make life with someone else fairly difficult. "Only an ideal woman would make him change his lifestyle, he says. Kaufmann, author of a recent book called "The Single Woman and Prince Charming," thinks this fierce new individualism means that people expect more and more of mates, so relationships don’t last long if they start at all. Eppendorf a blond Berliner with a deep tan, teaches grade school in the mornings. In the afternoon she sunbathes or sleeps, resting up for going dancing. Just shy of 50, she says she’d never have wanted to do what her mother did give up a career to raise a family. Instead, "I’ve always done what I wanted to do:live a self- determined life." The author quotes Eppendorf to show that ______.
A. some modern women prefer a life of individual freedom
B. the family is no longer the basic unit of society in present-day Europe
C. some professional people have too much work to do to feel lonely
D. most Europeans conceive living a single life as unacceptable
Rain forests 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 environment that 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 arc not especially affected by this change. They receive nearly the same amount of sunlight, and therefore heat, all year. Consequently, the weather in these regions 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 clown 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. Virtually all plant and animal species on Earth can be found in tropical rainforests.