此试题出现在
CMS专题
CMS专题
其他考试
Look at the topic headings below, marked A, B, C, D E, and F, and match them with the paragraphs in the text below. There is one extra heading which you don’t need to use. Questions 1-5 are based on the following passage. A. Decrease in food yields B. Drop in yield affected by reduction in research C. Pollution mining crops D. Desperate situation for Asia E. Population explosion compounds Asia’s problems F. International commerce threatens Asian agricultureWHY WE CAN’T AFFORD TO LET ASIA STARVE Among the problems afflicting a burgeoning world population, overcrowding, poverty and environmental degradation are combining to put at risk the very essence of our survival-food. “If by the beginning of the next century we have failed to satisfy the very basic needs of the two billion very poor and four billion poor, life for the rest of us could be extremely risky and uncomfortable,” predicts Dr. Klaus Lampe of the International Rice Research Institute (IRRI) in the Philippines. This is a highly threatening, even terrifying prediction for Asia, where 70 per cent of the world’s poor live but where reserves of good quality arable land have practically run out. Although the world regards Asia as the focus of an economic and industrial miracle, without adequate supplies of food, Lampe says, chaos could easily result in many countries. And the impact will be felt widely throughout the region. In the 1990s alone, he says, the cities of Asia will be swollen by a further 500 million people—nearly equal to the population of the United States and European Community combined. “The only growing population in Asia is that of the poor. Prime productive land is being used for city expansion and building roads, while thousands of hectares are being taken out of production each year because of salinity or alkalinity.” From the mid-1960s when the Green Revolution began, Asian food production doubled through a combination of highyielding crops, expanded farming area and greater intensification. From now on, growing enough food will depend almost entirely on increasing yield from the same, or smaller, area of land. However, a mysterious threat is emerging in the noticeably declining yields of rice from areas that have been most intensively farmed. Unless scientists can unravel why this is so, food output in Asia may actually stagnate at a time when population will double.Such issues, Lampe argues, while seen as remote by many countries and international corporations, will strike at their economic base as well. Societies that are too poor or driven by internal strife and civil war will be bad for investment or as markets for goods. Pressure from a rising tide of environmental and political refugees may also be felt. One significant factor undermining the agricultural economies of developing countries has been the farm trade war between the US and the EC. “We talk about environmental degradation and dangerous chemicals, yet spend billions of US dollars and ECUs producing things we don’t want which ruin local production systems and incomes for poor people,” Lampe says. And instead of developed countries helping struggling nations to develop sustainable food production systems, their policies tend to erode and destroy them. When world grain prices are bad, farmers in Asia’s uplands turn from rice to cash crops to supplement failing incomes, or clear larger areas of rainforest with catastrophic environmental consequences within just a few years. Cleared rainforest soils are highly erosive; even where they are not, they rapidly become acid and toxic under intense cultivation and plants die, forcing the clearing of ever-larger areas. Research at the IRRI has indicated that intensive rice production-growing two or three crops a year on the same land is showing signs of yield declines as great as 30 per cent. Evidence for this comes from as far a field as India, The Philippines and Indonesia. At the same time, agricultural research worldwide has been contracting as governments, non-government bodies and private donors reduce funding because of domestic economic pressures. This means, Lampe says, that at risk is the capacity to solve such problems as rice yield decline and research to breed the new generation of superyielding crops. Yet rice will be needed to feed more than half the human population—an estimated 4.5 billion out of 8.3 billion people by 2030. Compared with the building of weapons of mass destruction or the mounting of space missions to Mars, Lampe says, the devising of sustainable farming systems has little political appeal to most governments: “To them I say: I hope you can sleep well at night.”
从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性：
采用指数平滑法，假定本期预测需求为10000，本期实际需求9000，α=0．3，则下期预测值为（）。
下列属于职称性称呼的有（）
学龄前期的发展危机是：（）
肉类食品的营养价值特点有哪些？
如何判断一个新的突变是否属于一个新种？
直径小于或等于（）的煤气管道起火，可直接关闭煤气阀门灭火。
ATII“汇利丰”销售系统网点交易管理端的功能不包括（）。
家庭健康护理的目的是（）
暂无相关推荐~
由汉武帝派遣出使西域的第一个使者是（）
由汉武帝派遣出使西域的第一个使者是______。
由汉武帝派遣出使西域的第一个使者是（）。
由汉武帝派遣出使西域的第一个使者是______。
自汉初以来，继承秦制。汉武帝亲政后，频繁任免丞相。在位54年间，先后用相12人，其中4人在任上正常死亡，3人被免职，2人因罪自杀，3人下狱处死。汉武帝这样做的基...
自汉初以来，继承秦制。汉武帝亲政后，频繁任免丞相。在位54年间，先后用相12人，其中4人在任上正常死亡，3人被免职，2人因罪自杀，3人下狱处死。汉武帝这样做的基...
李清川等在《汉武帝朝丞相群体研究》一文中指出：“武帝（指汉武帝）朝的丞相群体不同于高祖时的功臣丞相，又不类于昭宣后的学术丞相，武帝朝丞相是汉代丞相的转折。”这里...
史载汉武帝元朔五年，封长沙王刘发之子刘贤为泉陵侯，都城在城北二里（《永州府志·城池》）汉武帝元鼎六年置零陵郡，泉陵侯国属零陵郡管辖。东汉光武帝刘秀改泉陵国为泉陵...
李清川等在《汉武帝朝丞相群体研究》一文中指出：“武帝（指汉武帝）朝的丞相群体不同于高祖时的功臣丞相又不类于昭宣后的学术丞相，武帝朝丞相是汉代丞相的转折。”这里的...
史载汉武帝元朔五年，封长沙王刘发之子刘贤为泉陵侯，都城在城北二里（《永州府志·城池》）汉武帝元鼎六年置零陵郡，泉陵侯国属零陵郡管辖。东汉光武帝刘秀改泉陵国为泉陵...