Against the supposition（假设）that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.
This finding suggests that taking steps to prevent northern forest to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over next several centuries as a result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling.
This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.
Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone（臭氧）levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.
“We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere.” Scientists tracked the change in amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when fire returns 20 years earlier than predicated, 0.5 watts per square meter of area burned are soaked up by the earth from greenhouse gases, but 0.9 watts per square meter will be sent back into space. The net effect is cooling. Watts are used to measure the rate at which energy is gained or lost from the earth.According to the new findings, taking steps to prevent northern forest fires may _______.
| A．result in a warming climate |
| B．cause the forest fires to occur more frequently |
| C．lead to a longer fire season |
| D．protect the forests and the environment there |
The following are all the immediate effects after a forest fire EXCEPT _________.
| A．large amounts of greenhouse gases enter the atmosphere |
| B．the levels of ozone which is a type of oxygen increase |
| C．snow on the ground mirrors more sunlight back into space |
| D．ashes from the fire fall on the ice surface and take in more radiation from the sun |
Earlier studies about northern forest fires _________.
| A．analyze all aspects of how northern fires influence climate |
| B．indicate that forest fires will pollute the atmosphere |
| C．suggest that people should take measures to protect environment |
| D．suggest that the fires will speed up climate warming |
The underlined part “soaked up” in the last paragraph most probably means ________.
| A．released | B．absorbed | C．created | D．distributed |
From the passage we can draw a conclusion that forest fires in Alaska, Canada and Siberia may __________.
| A．warm the climate as the supposition goes |
| B．allow more snow to reflect more sunlight into space and thus cool the climate |
| C．destroy large areas of forests and pollute the far-off sea ice |
| D．help to gain more energy rather than release more energy |
At one time, computers were expected largely to remove the need for paper copies of documents (文件) because they could be stored electronically. But for all the texts that are written, stored and sent electronically, a lot of them are still ending up on paper.
It is difficult to measure the quantity of paper used as a result of use of Internetconnected computers, although just about anyone who works in an office can tell you that when e-mail is introduced, the printers start working overtime.
“I feel in my bones this revolution is causing more trees to be cut down," says Ted Smith of the Earth Village Organisation.
Perhaps the best sign of how computer and Internet use pushes up demand for paper comes from the hightech industry itself, which sees printing as one of its most promising new markets. Several Internet companies have been set up to help small businesses print quality documents from a computer. Earlier this week HewlettPackard Co. announced a plan to develop new technologies that will enable people to print even more so they can get a hard copy of a business document, a medical record or just a oneline email, even if they are nowhere near a computer. As the company sees it, the more use of the Internet the greater demand for printers.
Does all this mean environmental concerns (环境问题) have been forgotten? Some activists suggest people have been led to believe that a lot of dangers to the environment have gone away.“ I guess people believe that the problem is taken care of, because of recycling(回收利用)，" said Kelly Quirke, director of the Rainforest Action Network in San Francisco. Yet Quirke is hopeful that hightech may also prove helpful. He says printers that print on both sides are growing in popularity. The action group has also found acceptable paper made from materials other than wood, such as agricultural waste.
1.The growing demand for paper in recent years is largely due to _______.
A.the rapid development of small businesses
B.the opening up of new markets
C.the printing of high quality copies
D.the increased use of the Internet
2.Environmentalists believe one possible way of dealing with the paper situation is ________.
A.to encourage printing more quality documents
B.to develop new printers using recycled paper
C.to find new materials for making paper
D.to plant more fastgrowing trees
3.HewlettPackard Co. has decided to develop new technologies because ________ .
A.people are concerned about the environment
B.printers in many offices are working overtime
C.small companies need more hard copies
D.they see a growing market for printers
4.What would be the best title for the text?
A.Computers and Printers
B.E-mail and the Business World
C.Internet Revolution and Environment
D.Modern Technology and New Markets
A newspaper in Helsinki,Finland,recently published a cartoon of a baby with a mobile phone,telling his parents that his diaper(尿布) needed changing.But it's hardly a joke.Helsinki is home to Nokia,the mobilephone maker.It's one of the most “mobile”cities in the world.About 92 percent of its households have at least one mobile phone.And the kids start young.
“A relatively normal age to get a mobile phone is now 7,”says Jan Virkki,marketing manager for a mobile phone company.Among the second graders at the Kulosaari Elementary School,the most popular object of desire this year is not a Barbie or a Gameboy.It is a Nokia mobile phone with a picture of their own choice on the screen.
“One of the first things we discuss when school starts is the rules for mobile phones,”says Tiia Korppi,a teacher.Among the rules:You have to put it away out of sight.You cannot turn it on.You cannot send text messages to your friends,or play amusing tunes(令人发笑的曲调)in class,or call your parents or call for a pizza during history.
1.The author uses the newspaper cartoon to show that ________ .
A.he is good at telling jokes
B.he cares much for children
C.mobile phones are toys for newborn babies
D.mobile phones are widely used in Finland
2.The passage is mainly about__________
A.different uses of mobile phones
B.a successful mobilephone maker
C.effect of mobile phones on children
D.school rules for the use of mobile phones
Tristan da Cunha, a 38squaremile island, is the farthest inhabited island in the world, according to the Guinness Book of Records. It is 1,510 miles southwest
of its nearest neighbor, St.Helena, and 1,950 miles west of Africa. Discovered
by the Portuguese admiral（葡萄牙海军上将）of the same name in 1506, and settled
in 1810, the island belongs to Great Britain and has a population of a few hund
red.
Coming in a close second—and often wrongly mentioned as the most distant land—is Easter Island, which lies 1,260 miles east of its nearest neighbor, Pitcair
n Island, and 2,300 miles west of South America.
The mountainous 64-square-mile island was settled around the 5th century, supposedly by people who were lost at sea. They had no connection with the outside world for more than a thousand years, giving them plenty of time to build more than 1,000 huge stone figures, called moai, for which the island is most famous.
On Easter Sunday, 1722, however, settlers from Holland moved in and gave the island its name. Today, 2,000 people live on the Chilean territory (智利领土).They share one street, a small airport, and a few hours of television per day.
1.It can be learned from the text that the island of Tristan da Cunha_______.
A.was named after its discoverer
B.got its name from Holland settlers
C.was named by the British government
D.got its name from the Guinness Book of Records
2.Which of the following is most famous for moai?
A. Tristan da Cunha. B. Pitcairn Island. C. Easter Island. D. St. Helena.
3. Which country does Easter Island belong to?
A. Britain. B. Holland. C. Portugal. D. Chile.
There are three separate sources of danger in supplying energy by nuclear power(原子能).
First, the radioactive material must travel from its place of production to the power station. Although the power stations themselves are strongly built, the containers used for the transport of the materials are not. Normally, only two methods of transport are in use, namely road or rail. Unfortunately, both of these may have an effect on the general public, since they are sure to pass near, or even through, heavily populated areas.
Second, there is the problem of waste. All nuclear power stations produce wastes that in most cases will remain radioactive for thousands of years. It is impossible to make these wastes nonradioactive, and so they must be stored in one of the inconvenient ways that scientists have invented. For example, they may be buried under the ground, or dropped into deserted mines, or sunk in the sea. However, these methods do not solve the problem, since an earthquake could easily break the containers.
Third, there may occur the danger of a leak(泄漏) or an explosion at the power station. As with the other two dangers, this is not very likely, so it does not provide a serious objection to the nuclear program. However, it can happen.Separately, these three types of dangers are not a great cause for worry. Taken together, though, the probability of disaster(灾难) is extremely high.
1.Which of the following is FALSE?
A.It is possible that a leak or an explosion occurs at a power station.
B.It is unusual for radioactive materials to be transported across land.
C.The containers are likely to be broken by an earthquake.
D.Nuclear wastes remain dangerous in most cases for many years.
2.The author thinks that the ways to store nuclear wastes are ________.
A.easy B.impossible C.reasonable D.ineffective
3.What do we learn from the last paragraph?
A.The power station is a safe place.
B.The dangers of nuclear energy can be prevented.
C.The general public are strongly against the nuclear program.
By itself, none of the three dangers is very likely to cause much worry.
4.What is this passage about?
A.Uses of nuclear power. B.Dangers from nuclear power.
C.Public anger at nuclear power. D.Accidents caused by nuclear power.
When a group of children politely stop a conversation with you, saying，“We have to go to work now.” you're left feeling surprised and certainly uneasy. After all, this is the 1990s and the idea of children working is just unthinkable. That is , until you are told that they are all pupils of stage schools, and that the “work” they go off to is to go on the stage in a theatre.
Stage schools often act as agencies (代理机构) to supply children for stage and television work. More worthy of the name “stage school” are those few places where children attend full time, with a training for the theatre and a general education.
A visit to such schools will leave you in no doubt that the children enjoy themselves. After all, what lively children wouldn't settle for spending only hal
f the day doing ordinary school work, and acting, singing or dancing their way through the other half of the day?
Then of course there are times for the children to make a name and make a little money in some big shows. Some stage schools give their children too much professional work at such a young age. But the law is very tight on the amount they can do. Those under 13 are limited to 40 days in the year; those over 13 do 80 days.
The schools themselves admit that not all children will be successful in the profession for which they are being trained. So what happens to those who don't make it? While all the leading schools say they place great importance on children getting good study results, the facts seem to suggest this is not always the case.
1.People would stop feeling uneasy when realising that the children they're talking to ________.
A. attend a stage school
B. are going to the theatre
C. have got some work to do
D. love singing and dancing
2.In the writer's opinion, a good stage school should ________ .
A. produce star performers
B. help pupils improve their study skills
C. train pupils in language and performing arts
D. provide a general education and stage training
3.“Professional work” as used in the text means ________ .
A. ordinary school work
B. moneymaking performances
C. stage training at school
D. acting, singing or dancing after class
4.Which of the following best describes how the writer feels about stage schools?
A. He thinks highly of what they have to offer.
B. He favours an early start in the training of performing arts.
C. He feels uncomfortable about children putting on night shows.
D. He doubts the standard of ordinary education they have reached.