Sustainable development is applied to just about everything from energy to clean water and economic growth, and as a result it has become difficult to question either the basic assumptions behind it or the way the concept is put to use. This is especially true in agriculture, where sustainable development is often taken as the measure of progress without a proper appreciation of historical and cultural perspectives.
　　To start with, it is important to remember that the nature of agriculture has changed markedly throughout history, and will continue to do so. Medieval agriculture in northern Europe fed, clothed and sheltered a mainly rural society with a much lower population density than it is today. It had minimal effect on biodiversity, and any pollution it caused was typically localized. In terms of energy use and the nutrients captured in the product it was relatively inefficient.
　　Contrast this with farming since the start of the industrial revolution. Competition from overseas led farmers to specialize and increase yields. Throughout this period food became cheaper, safer and more reliable. However, these changes have also led to habitat loss and to reducing biodiversity.
　　All this means that agriculture in the 21st century will have to be very different from how it was in the 20th. This will require thorough thinking. For example, we need to move away from the idea that traditional practices are certainly more sustainable than new ones. We also need to abandon the notion that agriculture can be “zero impact”. The key will be to abandon the rather simple and static(稳定的)measures of sustainability, which centre on the need to maintain production without increasing damage. Instead we need a more dynamic interpretation, one that looks at the pros and cons of all the various way land is used. There are many different ways to measure agricultural performance besides food yield: energy use, environmental costs, water purity, carbon footprint and biodiversity. It is clear, for example, that the carbon of transporting tomatoes from Spain to the UK is less than that of producing them in the UK with additional heating and lighting. But we do not know whether lower carbon footprints will always be better for biodiversity.
　　What is important is recognizing that sustainable agriculture is not just about sustainable food production.
【小题1】How do people often measure progress in agriculture?

A．By its impact on the environment	B．By its contribution to economic growth
C．By its productivity	D．By its sustainability

【小题2】Specialization and the effort to increase yields have resulted in              .

A．Localized pollution	B．The shrinking of farmland
C．the decrease of biodiversity	D．competition from overseas

【小题3】 What does the author think of traditional farming practices?

A．They are not necessarily sustainable	B．They have not kept pace with population growth
C．They have remained the same over the centuries	D．They are environmentally friendly

【小题4】What will agriculture be like in the 21st century?

A．It will abandon traditional farming practices	B．It will mainly keep traditional farming
C．It will go through complete changes	D．It will cause zero damage to the environment

【小题5】What is the author’s purpose in writing this passage?

A．To remind people of the need of sustainable development.

B．To urge people to rethink what sustainable agriculture is.

C．To advance new criteria for measuring farming progress.

D．To suggest ways of ensuring sustainable food production.

Children are our future, and it’s up to us to arm them with the tools to succeed. Sadly, today’s children are being armed with more dangerous tools like weapons （武器）, drugs and gangs. Once a relatively peaceful environment, many schoolyards of today are becoming unsafe for both students and teachers.

Home schools are available to give you choices. Home schooling provides top-quality education, flexibility, and freedom to create your own schedule. At Heritage Home School we believe the choice should be yours. Thanks in part to modern technology, home schooling information is becoming readily available across our nation. A recent study by the ITBS （Iowa Tests of Basic Skills） and TAP （Tests of Achievement and Proficiency） shows us that students of home schools do particularly well when compared with the nationwide average. In every subject at every grade level, students of home schooling scored obviously higher than those in public and private schools.

If you’re new to home schooling, you may be asking yourself, “Will home schools really work for my children?”

Fact: A nationwide study using a random（任意）selection of 1,516 families found students of home schooling to be scoring, on average, at or above the 80th percentile in all areas on standardized achievement test.

Note: The national average on standardized achievement tests is the 50th percentile. Collectively, the staff at Heritage Home School brings 65 years of experience in home schooling curriculum. We’ve placed students in the top 2 % of the nation in math and many are successfully moving on to college.

One study found that of the home schooled adults, 0% were unemployed, 0% were on welfare and 94% said home education prepared them to be independent persons. For more home schooling information, call us today toll free at（877）532-7665.

We can learn from the first paragraph that ________.

A. many schools armed their students with weapons

B. violence and crime exist in many schoolyards

C. students use weapons to defend their schoolyards

D. weapons are more dangerous than drugs

All of the following are true of home schools EXCEPT that ________.

A. students are free to choose their courses

B. students do well in important national tests

C. they help students find jobs

D. they help students to be independent　　

What is the purpose of the text?

A. To give information about different schools.

B. To compare home schools with other schools.

C. To suggest a new method of school education.

D. To persuade people to choose home schools.

The advertisement is mainly aimed at ________.

A. students   B. parents   C. teachers   D. adults

The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses relate to diet and forty percent of cancer relates to the diet as well, especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures.

That food is connected with illness is not a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats, and other food additives, caused cancer. Yet, these carcinogenic  additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this, penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA) has tried repeatedly to control these procedures, the practices continue.　　

What is the best possible title of the passage?

　 A. Drug and Food             　B. Cancer and Health

　C. Food and Health              D. Health and Drug

Which of the following statements is NOT true?

　 A. Drugs are always given to animals for medical reasons.

　 B. Some of the additives in our food are added to the food itself and some are

given to the living animals.

　 C. Researchers have known about the potential dangers of food additives for over

thirty-five years.

　 D. Food may cause forty percent of cancer in world.

How has science done something harmful to mankind?

　A. Because of science, diseases caused by polluted food haven’t been virtually

eliminated.

　 B. It has caused a lack of information concerning the value of food.

　 C. Because of the application of science, some potentially harmful substances

have been added to food.

　D. The scientists have preserved the color of meat, but not of vegetables.

What are nitrates used for?

　 A. They preserve flavor in packaged foods.

　 B. They preserve the color of meats.

　 C. They are the objects of research.

The word ‘carcinogenic’ most nearly means ‘_________’.

　 A. trouble-making                 B. color-maintaining

　 C. money-making                 D .cancer-causing

Today, roller skating is easy and fun. But a long time ago, it wasn't easy at all. Before 1750, the idea of skating didn't exist. That changed because of a man named Joseph Merlin. Merlin's work was making musical instruments. In his spare time he liked to play the violin. Joseph Merlin was a man of ideas and dreams. People called him a dreamer.

　One day Merlin received an invitation to attend a fancy dress ball. He was very pleased and a little excited. As the day of the party came near, Merlin began to think how to make a grand entrance at the party. He had an idea. He thought he would get a lot of attention if he could skate into the room.

　　Merlin tried different ways to make himself roll. Finally, he decided to put two wheels under each shoe. These were the first roller skates. Merlin was very proud of his invention and dreamed of arriving at the party on wheels while playing the violin.

　On the night of the party Merlin rolled into the room playing his violin. Everyone was astonished to see him. There was just one problem. Merlin had no way to stop his roller skates. He rolled on and on. Suddenly, he ran into a huge mirror that was hanging on the wall. Down fell the mirror, breaking to pieces. Nobody forgot Merlin's grand entrance for a long time!

The text is mainly about_________.

　  A. a strange man

　  B. an unusual party

　  C. how roller skating began

　  D. how people enjoyed themselves in the 18th century

　People thought Merlin was a dreamer because he________.

　  A. often gave others surprises　　　　  B. was a gifted musician

　  C. invented the roller skates　　 　　  D. was full of imagination

　 Merlin put wheels under his shoes in order to_______.

　  A. impress the party guests　　　　　  B. arrive at the party sooner

　  C. test his invention　　 　　　　　　  D. show his skill in walking on wheels

　 What is the main point the writer is trying to make in the last paragraph?

　  A. The roller skates needed further improvement.

　  B. The party guests took Merlin for a fool.

　  C. Merlin succeeded beyond expectation.

　  D. Merlin got himself into trouble.

A simple piece of clothesline hangs between some environmentally friendly Americans and their neighbors.

　　On one side stand those who see clothes dryers(干衣机) as a waste of energy and a major polluter of the environment. As a result, they are turning to clotheslines as part of the “what-I-can-do environmentalism(环境保护主义).”

　　On the other side are people who are against drying clothes outside, arguing that clotheslines are unpleasant to look at. They have persuaded Homeowners Associations (HOAs) across the U.S. to ban outdoor clotheslines, because clothesline drying also tends to lower home value in the neighborhood. This had led to a Right-to-Dry Movement that is calling for laws to be passed to protect people’s right to use clotheslines.　　

　　So far, only three states have laws to protect clothesline. Right-to-Dry supporters argue that there should be more.　　

　　Matt Reck, 37, is the kind of eco-conscious(有生态意识的) person who feeds his trees with bathwater and reuses water drops from his air conditioners to water plants. His family also uses a clothesline. But on July 9, 2007, the HOA in Wake Forest, North Carolina, told him that a dissatisfied neighbor had telephoned them about his clothesline. The Recks paid no attention to the warning and still dried their clothes on a line in the yard. “Many people say they are environmentally friendly but they don’t take matters in their own hands,” says Reck. The local HOA has decided not to take any action, unless more neighbors come to them.　　

　　North Carolina lawmakers are saying that banning clotheslines is not the right thing to do. But HOAs and housing businesses believe that clothesline drying reminds people of poor neighborhoods. They worry that if buyers think their future neighbors can’t even afford dryers, housing prices will fall.

　　Environmentalists say such worries are not necessary, and in view of global warming, that idea needs to change. As they say, “The clothesline is beautiful”. Hanging clothes outside should be encouraged. We all have to do at least something to slow down the process of global warming.”

One of the reasons why supporters of clothes dryers are trying to ban clothesline drying is that ________.

A. clothes dryers are more efficient   

B. clothesline drying reduces home value

C. clothes dryers are energy-saving    

D. clothesline drying is not allowed in most U.S. states

Which of the following best describes Matt Reck?

　　A. He is a kind-hearted man.         B. He is an impolite man.　　

　　C. He is an experienced gardener.    D. He is a man of social responsibility.　　

Who are in favor of clothesline drying?　　

　　A. housing businesses.           B. Environmentalists.　　

　　C. Homeowners Associations.     D. Reck’s dissatisfied neighbors.　　

What is mainly discussed in the text?　　

　　A. Clothesline drying: a way to save energy and money.　　

　　B. Clothesline drying: a lost art rediscovered.　　

　　C. Opposite opinions on clothesline drying.　　

　　D. Different varieties of clotheslines.