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The balance of nature is a very elaborate and delicate system of check and countercheck. It is continually being altered as climates change, as new organisms evolve, as animals or plants spread to new areas. But the alterations have in the past, for the most part, been slow, whereas with the arrival of civilized man, their speed has been multiplied much: from the evolutionary time-scale, where change is measured by periods of ten or a hundred thousand years, they have been transferred to the human time-scale in which centuries and even decades count.<br>Everywhere man is altering the balance of nature. He is facilitating the spread of plants and animals into new regions, sometimes deliberately, sometimes unconsciously. He is covering huge areas with new kinds of plants, or with houses, factories, slag heaps and other products of his civilization. He gets rid of some species on a large scale, but favors the multiplication of others. In brief, he has done more in five thousand years to alter the biological aspect of the planet than has nature in five million years.<br>Many of these changes which he has brought about have had unforeseen consequences. Who would have thought that the throwing away of a piece of Canadian waterweed would have caused half the waterways of Britain to be blocked for a decade? Or that provision of pot cacti for lonely settlers' wives would have led to Eastern Australia being covered with forests of prickly pears?<br>Who would have predicted that the cutting down of forests on the Adriatic coast, or in parts of Central Africa, could have reduced the land to a semi-desert with the very soil washed away from the bare rock? Who would have thought that improved communications would have changed history by the spreading of disease-sleeping sickness into East Africa, measles into Ocean, AIDS around the whole world?<br>These are spectacular examples, but examples on a smaller scale are everywhere to be found. We made a nature sanctuary for rare birds, providing absolute security for all species ; and we may find that some common and hardy kind of birds multiplies beyond measure and drive away the rare kinds in which we are particularly interested. We see, owing to some little change brought about by civilization, the starting spread over the English countryside in hordes. We improve the yielding capacities of our cattle; and find that how they exhaust the pastures which were sufficient for less demanding stock. We gaily set about killing the carnivores that disturb our domestic animals, the hawks that eat our fowls and game-birds; and find that in so doing we are also removing the brake that restrains the multiplication of mice and other little rodents that gnaw away the farmers' profits.<br>The author's concern with the balance of nature, as evidenced by this passage, is best defined as______.

A. intense and objective
B. conscientious but humorless
C. sincere and subjective
D. deep but dry

不定项选择题

The city's attempt to resolve its education plight is aptly illustrated by the story of Pe-ter DeMarco, formerly an aspiring comedian, who was recruited to teach English in the city's high schools. Mr. DeMarco and about 300 other people joined the teaching ranks under the New York Teaching Fellows program, an initiative set up to fill numerous "technical vacancies" that are usually filled by teachers lacking full certification.<br>Some 2,300 people from as far away as South Africa and Nigeria applied for the scheme. The successful candidates underwent an intensive induction program at the City University of New York during the summer and were sent to classrooms at the beginning of the school year. Most were sent to schools in troubled parts of the city.<br>For many, including Mr. DeMarco, becoming a teacher meant a pay cut. "But I am not doing this for money. . . I am doing it for some meaning, and to make an impact on some lives," he says.<br>Now, at 38, after a variety of jobs—including stand-up comedy and acting roles—he says he is "finally where I want to be". Teaching is difficult but satisfying, Mr. DeMarco says. He liked the job a week into it and still likes it now, months later. He plans to teach through the two years required by the program, and possibly even longer. "Tough as they are, the kids are great. .. some of their writing and creativity, it is just phenomenal. "<br>People like Mr. DeMarco "demonstrated concern for the quality of teaching in New York schools", says Harold Levy, chancellor of the state's board of education. His board estimates New York will need 40,000 to 55,000 more teachers than it expects to get over the next five years. Colleges are not producing enough teachers, he says. Teacher shortage is a national problem in the U. S. , art issue highlighted in this year's presidential election.<br>It can be inferred from the passage that the author thinks .

A. New York has already solved its education plight
B. New York is far away from solving its teacher shortage
C. Peter DeMarco has helped New York to solve the problem
D. there's great progress made by New York this year

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