The 18th century Witnessed a new literary form--the modem English novel, which is contrary to the medieval romance, gives a ______ presentation of life of the common people.

At the time, many industrialism argued that they shouldn’t have to pay for better pollution control because science had yet to suggest a plausible biological mechanism by which breathing low concentrations of urban dust might sicken or kill people.
Now, scientists at the University of Texas Houston Health Science Center describe\how they uncovered what they think may be one of the basic elements of that toxicity.
On the alert for foreign debris, a community of white blood cells known as alveolar macrophages patrols small airways of the lung. When these cells encounter suspicious material, they identify it and send out a chemical clarion call to rally the immune system cells best suited to disabling and disposing of such matter.
The trick is to recruit only as many troops as are needed, If they call in too many, the lung can sustain inflammatory damage from friendly fire. Alongside the small troop of macrophages that stimulates defense measures, a larger squadron of macrophages halts immune activity when it threatens the host.Andfij Holian and his coworkers in Houston have found that people with healthy lungs normally have 10 times as many suppressor macrophages as stimulatory ones. In people with asthma and other chronic lung diseases — who face an increased risk of respiratory disease from inhaling urban dust -- that ratio may be only 3 to 1. The reason for the difference is not known.
In a report to be published in the March Environmental Health Perspectives, Holian’s team describes test-tube studies of human alveolar macrophages. The macrophages showed no response to ask collected from the Mount St. Helen’s eruption. However, when exposed to airborne dust from St. Louis and Washington, D.C. , most of the suppressor macrophages underwent apoptosis, or cellular suicide, while the stimulatory ones survived unaffected. Ash from burned residual oil, a viscous boiler fuel, proved even more potent at triggering suppressor cell suicides.
It this test-tube system models what’s actually happening in the human lung, Holian told Science News, the different responses of the two classes of lung macrophages could result in an overly aggressive immune response to normal triggering events. Indeed, he says, it would be the first step in a cascade that can end in inflammatory lung injury. "We may one day be able to target this upstream event and prevent that injury."
"This is, I think, an important contribution to the overall story," says Daniel L. Costa of EPA’s pulmonary toxicology branch in Research Triangle Park, N.C.
Studies by EPA suggest that certain metals -- especially iron, vanadium, nickel, and copper -- in smoke from combustion of fossil fuels trigger particularly aggressive inflammatory responses by lung cells. Costa says these metals play a "preeminent" role in the toxicity of airborne particulates. When EPA researchers removed the metals, they also removed the toxicity, he says. Moreover, he notes, these metals tend to reside on the smallest water-soluble particles in urban air -- the fraction targeted for more aggressive controls under the new rules.
John Vandenberg, assistant director of EPA’s National Health and Environmental Effects Research Laboratory in Research Triangle Park, says Holian’s results are "a nice complement to our studies.\

As a Canadian immersion teacher, I was enthused to see the letter from John Whelpton about the Canadian immersion experience (South China Morning Post, June 11). I would like to take this opportunity to expand upon and challenge some of his views.
I agree that the Canadian immersion and bilingual schools have been successful in producing functionally bilingual students. In the province of Manitoba, there are French, Ukrainian, and German immersion schools; Hebrew bilingual schools; and a school for native Indian students. English immersion programs are popular for students from the province of Quebec as well as from countries such as Libya and Japan. However, Mr. Whelpton’s suggested condition that teachers in these schools must be fully bilingual may be unnecessary. For example, primary teachers can and do function with a smaller vocabulary than secondary teachers.
Secondly, it is doubtful that students will use English because they understand and accept the objective of "making English the language of the classroom" which is a rather sterile motive. One reason that Canadian immersion programs work is because of the commitment to Whole Language Learning, that is, children learn a language, (first or second), by using it to transmit or receive meaningful messages that are interesting, real and important.
They want to make their needs and desires known and to understand the world around them. Immersion programs integrate language and content in an activity-based, child-centered manner so that the child is motivated to use the second language as a tool to transmit and receive messages related to social and academic interests. In addition the second language is modeled throughout the school, is encouraged and rewarded, and thus becomes the language of choice. It is not necessary to "abandon" Cantonese; an immersion program should pro- vide some daily instruction in the first language.
Mr. Whelption’s third argument that all the students in one class need to be at approximately the same level of English proficiency when they switch to English is unrealistic and unprofitable. How does a teacher group children who have a huge vocabulary but poor grammar skills and others who have correct grammar but a poor vocabularyAlso, suppose the students have similar language abilities but different learning styles! The odds are that a teacher, at any point in time, will be teaching at a level that is too difficult for one-third, too easy for one-third and appropriate for the final one-third of the students. Hence the concept of cooperative learning: students in heterogeneous groups with a mixture of personalities, talents and weaknesses (a more realistic reflection of life) learn better as they cooperate, instead of compete, and depend on each other for support and information.
This type of learning environment frees the teacher from the traditional lecturing mode in favor of circulating, monitoring and challenging the students to make use of their different experiences to expand their knowledge and skills.
I support immersion programs not simply so that Hong Kong remains "competitive as an international business center", but because children who learn a second language partake in an educational experience that expands their horizons in addition to their cognitive, social and affective capabilities; important goals of education indeed. (530)