问答题

Directions: Please put the following English paper into Chinese .
Section A
The most intensive forms of rural land use for agricultural purposes are those concerned with harvestable crops or with the production of animal products. Unlike primitive agriculture, which involved only the temporary removal of natural vegetation and depended for a short period of time natural soil fertility, conventional agriculture today uses large inputs of chemicals, energy and technical skills to produce increased yields of crops or animals. In the technologically advanced countries food production is often greater than population growth, and it is possible to retire former farmlands from use and to produce crops according to demand without approaching the maximum yields obtainable. The so-called Green Revolution has been based on the spread such farming methods to less developed nations of the world. It has been made possible by the breeding of high-yielding forms of grain specifically adapted to the ecological conditions of the countries involved. The decision to use an area of land for high-yield agriculture essentially rules out its use for attar purposes. The intensive production of farm crops in an agricultural region may also have side effects; as has been previously noted, these may include the pollution of other the pesticides, herbicides, or other agricultural chemicals blown or washed from farmlands affect vegetation and animal life elsewhere. Nevertheless, committing an area to intensive agricultural production does not rule out its future restoration for other uses. As long as the soils are well cared for, such areas can be convened quickly to other purposes if it is not necessary to keep them in farm production. Abandoned farmlands in the southern United States, far example, are now highly productive forest areas, and former farming lands elsewhere are being used to support wildlife and outdoor recreation. In general planning for conservation of natural resuources, intensive use and high production in those areas best suited for farming must be of course, that the polluting effects of these activities on the general environment are avoided. Such concentration can spare the destruction of other resources through to use inadequate lands for marginal farming activities.