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在按成本加酬金确定合同价时，最不利于降低成本的是成本加固定金额酬金。 ()
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STRUGGLING TO END CRIME
"YOUTHS Claim Boredom Is Main Cause of Juvenile Crime," declared a headline in a leading British newspaper. "Home Strife Blamed for Rising Crime," said another. And a third stated: "Addictions" Prompt Thousands of Crimes'." The magazine Philippine Panorama estimated that 75 percent of all violent crimes in Manila were committed by drug abusers.
Other factors may also contribute to sparking criminal behavior. "Poverty in juxtaposition to great wealth" is one that was referred to by the Nigerian inspector-general of police. Peer pressure and poor job prospects, the absence of strong legal deterrents, the general breakdown in family values, the lack of respect for authority and law, and the excessive violence in films and videos are also cited.
Another factor is that many people no longer believe that crime does not pay. A sociologist at Bologna University in Italy observed that over a period of many years, "the number of thefts reported and the number of persons convicted for 'them have followed opposite trends." He noted that "the number of convictions in proportion to the total number of reported thefts has plummeted from 50 to 0.7 percent."
Sad but true are the words of The New Encyclopaedia Britannica: "Increasing crime appears to be a feature of all modern industrialized societies, and no developments in law or penology can be shown to have had a significant impact on the problem. For modern urbanized society, in which economic growth and personal success are dominant values, there is no reason to suppose that crime rates will not continue to increase."
IS THIS VIEW TOO NEGATIVE？
Is the situation really all that bad？ Do not some localities report crime decreases？ True, some do, but statistics can be misleading. For example, it was reported that crime in the Philippines decreased by 20 percent after a gun ban was introduced. But Asiaweek explained that one official believes that car thieves and bank robbers had stopped stealing cars and robbing banks and had "switched to kidnapping. Fewer bank robberies and car thefts caused a drop in total cases of crime, but this decrease lost much of its significance in view of the fourfold increase in kidnappings!
Reporting on Hungary, the magazine BVG wrote: "Compared with the first half of 1993, crime figures are down by 6.2 percent. What the police forgot to mention is that the decrease is mainly due to administrative changes." The monetary level at which cases of theft, fraud, or vandalism were previously registered was raised by 250 percent. So property crimes involving values below this level are no longer registered. Since crimes involving property account for three fourths of all crime in the country, the decrease was hardly genuine.
Arriving at accurate crime figures is admittedly difficult. One reason is that many crimes—perhaps up to 90 percent in certain categories—go unreported. But arguing whether crime has decreased or increased is actually beside the point. People yearn for crime to be eliminated, not just reduced.
The number about reported thefts and convictions is used to illustrate that ______.
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, ______.
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.
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