题目内容
These marshes are the breeding ground for snow geese. Once destroyed, some fear the species will take over the habitat of the Canada goose—a popular game bird in Minnesota. If this happens, Minnesota hunting and land conditions could be greatly affected.
The snow goose population has been on the rise in the last 25 years, but numbers are hitting an all-time high. This year there is an estimated 4.5 or 6 million birds, triple what the population was 25 years ago.
Although effects of the snow goose invasion aren't apparent in Minneapolis, northern Minnesota and Canada can clearly see the signs. The population growth is due to the birds' wintering habits. They fly south to Louisiana, Texas and Mississippi to nest. The conditions and food availability there have made it possible for more birds to survive the winter and make the trip back north. The period over which they've increased in number correlates to a change in agriculture practices in the region.
After World War II, there was an increase in man-made fertilizers, yielding an increase of corn, rice, wheat and other crops. There have also been other changes in agricultural practices causing an increase of production in cereal crops.
The geese find the agricultural areas better than the natural areas. The geese have escaped from any natural limits. They are not doing this on their own; it is in response to human practices.
Usually, about 70 to 75 percent of the birds make it back to Canada in late winter and early spring. But the surviving number of snow geese has steadily climbed each year to reach 95 percent in the last couple of years. Because so many survive, they strip the capacity of the breeding ground.
The snow geese are destroying salt marshes where they nest in the summer, about 30 percent of the salt marshes are completely destroyed, leaving them as inhabitable mud flats. Another 35 percent of salt marshes are significantly damaged.
There are three possible solutions: Let the problem take care of itself and wait for the population to crash, deal directly with the population by changing hunting limits and regulations or address the cause of the problem in the south.
According to the author, if the northern marshes are destroyed, ______.
查看答案
搜索结果不匹配？点我反馈
更多问题
Historians, particularly those investigating the history of women, now seriously question this assumption of transforming power. They conclude that such dramatic technological innovations as the spinning jenny, the sewing machine, the typewriter, and the vacuum cleaner have not resulted in equally dramatic social changes in women's economic position or in the prevailing evaluation of women's work. The employment of young women in textile mills during the Industrial Revolution was largely an extension of an older pattern of employment of young, single women as domestics. It was not the change in office technology, but rather the separation of secretarial work, previously seen as an apprenticeship for beginning managers, from administrative work that in the 1880's created a new class of "dead-end" jobs, thenceforth considered "women's work". The increase in the numbers of married women employed outside the home in the twentieth century had less to do with the mechanization of housework and an increase in leisure time for these women than it did with their own economic necessity and with high marriage rates that shrank the available pool of single women workers, previously, in many cases, the only women employers would hire.
Women's work has changed considerably in the past 200 years, moving from the household to the office or the factory, and later becoming mostly white-collar instead of blue collar work. Fundamentally, however, the conditions under which women work have changed little since before the Industrial Revolution: the segregation of occupations by gender, lower pay for women as a group, jobs that require relatively low levels of skill and offer women little opportunity for advancement all persist, while women's household labor remains demanding. Recent historical investigation has led to a major revision of the notion that technology is always inherently revolutionary in its effects on society. Mechanization may even have slowed any change in the traditional position of women both in the labor market and in the home.
It can be inferred from the passage that, before the Industrial Revolution, most women worked in ______.
Computers, and especially connecting to the Internet, provide unique opportunities to enhance science and math education.
Take, for example, the project called Chickscope, a program that would only be possible with the Internet. Which came first, the chicken or the egg？ In schools across the country, many teachers use the egg as a springboard to a demonstration of how life begins and develops, setting up an incubator to hatch chicks in the classroom. Fascinated kids watch as a chick pecks its way through the shell and finally struggles out.
But what if the kids could see inside the egg and observe the changes in the chick embryo during its three weeks of growth, gathering egg-related data along the way？ Chickscope, an interdisciplinary program based at the University of Illinois at Urbana-Champaign, permits just that. Kids see inside the egg courtesy of magnetic resonance imaging (MRI) technology. Without leaving their classrooms, East Central Illinois high school students and teachers can access and operate an MRI system via the World Wide Web, and watch as the chick embryo matures.
"They actually run the MRI system, collect data, and run experiments," says Clint Potter, Chickseope project leader and a researcher at the university's Beckman Institute for Advanced Science and Technology. A key side benefit: Students not only learn about the subject at hand, they feel as though they are part of "a community of learners," as one teacher put it.
This community concept is key to many of the prevailing theories about how best to learn science. Kids tend to learn faster and more deeply when the learning experience is shared. And that's what makes the Internet, with its built-in ability to promote interaction, so powerful. Students can use the Net as a tool to construct solutions to problems, learning from one another in the process by doing, not by rote instruction.
And community learning can benefit the community. In an environmental science class at Covington High School in Covington, Louisiana, for example, students used the Internet to focus on cleaning up a local polluted stream by researching water-quality improvement techniques. With the help of a computer, they put together multimedia presentations for local and state political leaders. The Army Corps of Engineers awarded the city a grant to proceed with cleanup in large part because of the students' work, which the Corps said was the equivalent of ＄ 50,000 of research and preparation time.
Because the Internet is not limited in time and space, it can transport kids to realms that are intrinsically more exciting than their own classrooms. Thousands of elementary school students connected by the Internet are joining biologist David Anderson in collecting satellite data that tracks the marathon flights of two species of albatross that nest on Tern Island in Hawaii.
The Albatross Project, which is sponsored by the National Science Foundation, seeks to learn how the availability of food affects the large seabirds' extremely Mow reproduction. But it has another purpose: sparking children's interest in science by involving them in actual research. The project seemed the perfect opportunity to engage school-age kids in science, says Anderson.
According to the passage, which of the following should be encouraged to enhance learning of math and science？ Problem solving. Actual research. Repetitive in-class drills. Group work. Rote learning.
事故应急预案在应急救援中的重要作用包括（)。A．事故应急预案在应急系统中起着关键作用，它明确了在事故应急预案在应急救援中的重要作用包括()。
SECTION B INTERVIEW
Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions.
Now listen to the interview.
听力原文：Interviewer: Well Charles, I must say that your shop is pretty remarkable. Urn, it's basically a sweetshop, but you also do stationery and greeting cards and tobacco and fireworks
Shopkeeper: And newspapers.
Interviewer: And newspapers. Ah. And apart from all that, you've got photocopiers...
Shopkeeper: That' s right.
Interviewer: And a fax machine.
Shopkeeper: Indeed.
Interviewer: Yes. How did.. I mean, why the photocopiers？
Shopkeeper: Everything that's happened in my shop has almost happened by accident. But when I got into Clifton, I needed a photocopy one day and no one could tell me where to go. So it struck me that if I didn't know where to go, other people were in the same situation, so that's why I started it. And then I added on a facsimile machine because it seemed like a natural progression at the time. And all sorts of people use it.
Interviewer: Yes, who, what sort of people do use it？
Shopkeeper: Urn, a lot of professional people—surveyors, engineers—particularly people who need to send plans. Because in the past you could send messages via telex, but a telex can't express a plan, whereas facsimile has that dimension, the added dimension.
Interviewer: Right. And do people send these fax messages abroad, or is it just to this country？
Shopkeeper: Well, it's surprising because when I started, I thought I'd be sending things to London and maybe Birmingham but, in fact, a high percentage of it is sent abroad, because it's immediate, it's very speedy. You can send a message and get an answer back very quickly.
Interviewer: And how much would it cost, for example, if I wanted to send a fax to the United States？
Shopkeeper: Well, a fax to the United States would cost you five pounds for a page. And when you think that in England by the Royal Mail, it would cost you twelve pounds to send a page by special delivery, it's actually a good value.
Interviewer: OK. What about your hours？ How long do you have to spend actually in the shop？
Shopkeeper: Well, the shop is open from, essentially from eight in the morning until six at night, six days a week, and then a sort of fairly flexible morning on a Sunday. Urn, and of those hours, I'm in it quite a lot.
Interviewer: And how long have you actually had the shop？
Shopkeeper: I started to have my shop in 1982, the 22nd of December, oh, sorry, the 22nd of November. It sticks in my brain.
Interviewer: And did you enjoy it？
Shopkeeper: Yes, overall I enjoy ii. Running a business by yourself is jolly hard work and you never quite like every aspect all the time. 95% of the customers I love. Uh, 2% I really, you know, I'm not too bothered about. And 3% I positively hate.
Interviewer: What, What's the problem with those？ Are they people who stay around and talk to you when you're busy or complain or what？
Shopkeeper: Urn, it's hard to categorize really. I find people who are just totally rude, urn, unnecessary, and I don't really need their custom. And I suppose they form. the volume of the people that I don't like. But it's a very, very, very small percentage.
Interviewer: But is there a danger that shops like yours will disappear, more and more？
Shopkeeper: I think there's a very, very great danger that the majority of them will disappear.
Interviewer: Why's that？
Shopkeeper: Simply because costs of running a shop have just become very, very high. To give you some example, in the time that I've been there, my rent has quadrupled, the local property tax have doubled, other costs have gone up proportionately. And at the end of the day it is a little bit hard to try to kee
微信支付 
支付宝支付