How does the professor emphasize his point about force classification？
A．By stating the definition and components of each category.
B．By explaining the relationship between the two categories.
C．By identifying the members of each category.
D．By comparing the features of the two categories.
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A year ago, this lush coastal field near Rome was filled with orderly rows of delicate durum wheat, used to make high quality Italian pasta. Today it overflows with rapeseed, a tall, gnarled weedlike plant bursting with coarse yellow flowers that has become a new manna for European farmers: rapeseed can be turned into biofuel.
Lured by generous new subsidies to develop alternative energy sources - and a measure of concern about the future of the planet - European farmers are plunging into growing crops that can be turned into fuels meant to produce fewer emissions than gas or oil when burned. They are chasing after their counterparts in the Americas who have been cropping for biofuel for more than five years.
"This is a much-needed boost to our economy, our farms," said Marcello Pini, a farmer, standing in front of the sea of waving yellow flowers he planted for the first time this year. "Of course we hope it helps the environment, too."
In March, the European Commission, disappointed by the slow growth of thebiofuels industry in Europe, approved a directive that included a "binding target" requiring member states to use 10 percent biofuel for transport by 2020 - the most ambitious and specific goal in the world.
Most EU states are currently far from achieving the target, and are introducing new incentives and subsidies to boost production.
As a result, bioenergy crops have now replaced food as the most profitable crop in a number European countries. In this part of Italy, for example, the government guarantees the purchase of biofuel crops at €22 per 100 kilograms, or $13.42 per 100 pounds - nearly twice the €11-to-€12 rate per 100 kilograms of wheat on the open market last year. Better still, European farmers are allowed to plant biofuel crops on "set-aside" fields, land that EU agriculture policy would otherwise require them to leave fallow to prevent an oversupply of food.
But an expert panel convened by the UN Food and Agriculture Organization this month pointed out that the biofuels boom produces both benefits as well as tradeoff and risks - including higher and wildly fluctuating global food prices. In some markets grain prices have nearly doubled because farmers are planting for biofuels,
"At a time when agricultural prices are low, in comes biofuel and improves the lot of farmers and injects life into rural areas," said Gustavo Best, an expert at the United Nations Food and Agriculture Organization in Rome. "But as the scale grows and the demand for biofuel crops seems to be infinite, we&39;re seeing some negative effects and we need to hold up a yellow light."
Josette Sheeran, the new head of the UN World Food program, which fed nearly 90 million people in 2006, said that biofuels created new dilemmas for her agency. "An increase in grain prices impacts us because we are a major procurer of grain for food. So biofuels are both a challenge and an opportunity." In Europe, the rapid conversion of fields that once grew wheat or barley to biofuel oils like rapeseed is already leading to shortages of ingredients for making pasta and brewing beer, suppliers say. That could translate into higher prices in supermarkets.
"New and increasing demand for bioenergy production has put high pressure on the whole world grain market," said Claudia Conti, a spokeswoman for Barilla, one of the largest Italian pasta makers. "Not only German beer producers, but Mexican tortilla makers have see the cost of their main raw material growing quickly to quickly to historical highs."
For some experts, more worrisome is the potential impact to low-income consumers from the displacement of food crops by bioenergy plantings. In the developing world, the shift from growing food to growing more lucrative biofuel crops destined for richer countries could create serious hunger and damage the environment in places where wild land is converted to biofuel cultivation, the FAO expert panel concluded.
But officials at the European Commission say they are pursuing a measured course that will pre -
The word "absurd" in the passage is closest in meaning to
A．ludicrous.
B．ambiguous.
C．incongruous.
D．allege -
能源是人类社会赖以生存和发展的重要物质基础。纵观人类社会发展的历史，人类文明的每一次重大进步都伴随着能源的改进和更替。能源的开发利用极大地推进了世界经济和人类社会的发展。
过去100多年里，发达国家先后完成了工业化，消耗了地球上大量的自然资源，特别是能源资源。当前，一些发展中国家正在步入工业化阶段，能源消费增加是经济社会发展的客观必然。
中国是当今世界上最大的发展中国家，发展经济，摆脱贫困，是中国政府和中国人民在相当长一段时期内的主要任务。20世纪70年代末以来，中国作为世界上发展最快的发展中国家，经济社会发展取得了举世瞩目的辉煌成就，成功地开辟了中国特色社会主义道路，为世界的发展和繁荣作出了重大贡献。
中国是目前世界上第二位能源生产国和消费国。能源供应持续增长，为经济社会发展提供了重要的支撑。能源消费的快速增长，为世界能源市场创造了广阔的发展空间。中国已经成为世界能源市场不可或缺的重要组成部分，对维护全球能源安全，正在发挥着越来越重要的积极作用。 -
One of the biggest decisions Andy Blevins has ever made, and one of the few he now regrets, never seemed like much of a decision at all. It just felt like the natural thing to do.
In the summer of 1995, he was moving boxes of soup cans, paper towels and dog food across the floor of a supermarket warehouse, one of the biggest buildings here in southwest Virginia. The heat was brutal. The job had sounded impossible when he arrived fresh off his first year of college, looking to make some summer money, still a skinny teenager with sandy blond hair and a narrow, freckled face. But hard work done well was something he understood, even if he was the first college boy in his family. Soon he was making bonuses on top of his $6.75 an hour, more money than either of his parents made. His girlfriend was around, and so were his hometown buddies. Andy acted more outgoing with them, more relaxed. People in Chilhowie noticed that.
It was just about the perfect summer. So the thought crossed his mind: maybe itdid not have to end. Maybe he would take a break from college and keep working. He had been getting C&39;s and D&39;s, and college never felt like home, anyway.
"I enjoyed working hard, getting the job done, getting a paycheck," Mr. Blevins recalled. "I just knew I didn&39;t want to quit."
So he quit college instead, and with that, Andy Blevins joined one of the largest and fastest-growing groups of young adults in America. He became a college dropout, though nongraduate may be the more precise term.
Many people like him plan to return to get their degrees, even if few actually do. Almost one in three Americans in their mid-20&39;s now fall into this group, up from one in five in the late 1960&39;s, when the Census Bureau began keeping such data. Most come from poor and working-class families.
That gap had grown over recent years. "We need to recognize that the most serious domestic problem in the United States today is the widening gap between the children of the rich and the children of the poor," Lawrence H. Summers, the president of Harvard, said last year when announcing that Harvard would give full scholarships to all its lowest-income students. "And education is the most powerful weapon we have to address that problem."Andy Blevins says that he too knows the importance of a degree. Ten years after trading college for the warehouse, Mr. Blevins, 29, spends his days at the same supermarket company. He has worked his way up to produce buyer, earning $35,000 a year with health benefits and a 401（k) plan. He is on a path typical for someone who attended college without getting a four-year degree. Men in their early 40&39;s in this category made an average of $42,000 in 2000. Those with a four-year degree made $65,000.
Mr. Blevins says he has many reasons to be happy. He lives with his wife, Karla, and their year-old son, Lucas, in a small blue-and-yellow house in the middle of a stunningly picturesque Appalachian valley.
"Looking back, I wish I had gotten that degree," Mr. Blevins said in his soft-spoken lilt. "Four years seemed like a thousand years then. But I wish I would have just put in my four years."
Why so many low-income students fall from the college ranks is a question without a simple answer. Many high schools do a poor job of preparing teenagers for college. Tuition bills scare some students from even applying and leave others with years of debt. To Mr. Blevins, like many other students of limited means, every week of going to classes seemed like another week of losing money. "The system makes a false promise to students," said John T. Casteen III, the president of the University of Virginia, himself the son of a Virginia shipyard worker. -
提起东盟国家，我就想起去年在东盟会议上，马哈蒂尔先生和吴作栋先生曾经形象地把中国比喻成一个友好的大象。
他们说，中国的崛起不会对其他们存在任何威胁。中国有5000年的文明史，有过辉煌的过去，也有过屈辱的往事。中国的崛起是多少代中国人的梦想。中国和平崛起的要义在什么地方？
第一，中国和平崛起就是要充分利用世界和平的大好时机，努力发展和壮大自己。同时又以自己的发展，维护世界和平。
第二，中国的崛起应把基点主要放在自己的力量上，独立自主、自力更生，艰苦奋斗，依靠广阔的国内市场、充足的劳动力资源和雄厚的资金储备，以及改革带来的机制创新。
第三，中国的崛起离不开世界。中国必须坚持开放的政策，在平等互利的原则上，同世界一切友好国家发展经贸往来。
第四，中国的崛起需要很长的时间，恐怕要多少代人的努力奋斗。
第五，中国的崛起不会妨碍任何人，也不会威胁任何人，也不会牺牲任何人。中国现在不称霸，将来即使强大了也永远不会称霸。