【答案解析】原文： Good morning, class. My topic today is how to feed a hungry world. The world’s population is expected to grow from 6.8 billion today to 9.1 billion by 2050. Meanwhile, the world’s population more than doubled from 3 billion between 1961 and 2007. Simultaneously, food production has been constrained by a lack of scientific research. Still, the task of feeding the world’s population in 2050 seems "easily possible". What is needed is a second green revolution. This is an approach that is described as the sustainable growth of global agriculture. Such a revolution will require a wholesale shift of priorities in agricultural research. There is an urgent need for new crop varieties. They must offer higher yields, but use less water, nitrogen-rich fertilizers or other inputs. These new crops must also be more resistant to drought, heat and pests. Equally crucial is lower-tech research into basics such as crop rotation and mixed farming of animals and plants on small farms. Developing nations could score substantial gains in productivity by making better use of modern technologies and practices. But that requires money. It is estimated that to meet the 2050 challenge, investment must double to $83 billion US dollars a year. Most of that money needs to go towards improving agricultural infrastructure. Everything from production to storage and processing must improve. However, research agendas need to be focused on the needs of the poorest and most resource-limited countries. It is there that most of the world’s population lives, and it is there that population growth over the next decades will be the greatest. To their credit, the world’s agricultural scientists are embracing such a broad view. In March, for example, they came together at the first Global Conference on Agricultural Research to begin working out how to change research agendas to help meet the needs of farmers in poorer nations. But these plans will not bear fruit unless they get considerably more support from policy-makers. The growth in public agricultural-research spending peaked in the 1970s and has been shrinking ever since. The big exception is China, where spending has far surpassed other countries over the past decade. China seems set to transition to become the key supplier of relevant science and technology to poorer countries. But developed countries have a humanitarian responsibility, too. Calls by scientists for large increases in the appropriation of funds for public spending on agricultural research are more than justified. 22.What is an urgent need for feeding the world’s population in 2050, according to the speaker? 23.Where should most of the money be invested to feed the ever-growing population? 24.Why does the speaker give credit to the world’s agricultural scientists? 25. What makes China exceptional in comparison with the rest of the world?讲话者在讲话中提到，我们需要的是第二次绿色革命。这样一场革命将需要全面转移农业研究重点。迫切需要新品种的作物。选项D的说法与讲话内容一致，故为正确答案。讲话中提到，新品种的农作物使用更少的富含氮的肥料，选项A不符合题干所问，可排除。其余两个选项讲话均未提及，可排除。
【正确答案】
A
【答案解析】原文： Good morning, class. My topic today is how to feed a hungry world. The world’s population is expected to grow from 6.8 billion today to 9.1 billion by 2050. Meanwhile, the world’s population more than doubled from 3 billion between 1961 and 2007. Simultaneously, food production has been constrained by a lack of scientific research. Still, the task of feeding the world’s population in 2050 seems "easily possible". What is needed is a second green revolution. This is an approach that is described as the sustainable growth of global agriculture. Such a revolution will require a wholesale shift of priorities in agricultural research. There is an urgent need for new crop varieties. They must offer higher yields, but use less water, nitrogen-rich fertilizers or other inputs. These new crops must also be more resistant to drought, heat and pests. Equally crucial is lower-tech research into basics such as crop rotation and mixed farming of animals and plants on small farms. Developing nations could score substantial gains in productivity by making better use of modern technologies and practices. But that requires money. It is estimated that to meet the 2050 challenge, investment must double to $83 billion US dollars a year. Most of that money needs to go towards improving agricultural infrastructure. Everything from production to storage and processing must improve. However, research agendas need to be focused on the needs of the poorest and most resource-limited countries. It is there that most of the world’s population lives, and it is there that population growth over the next decades will be the greatest. To their credit, the world’s agricultural scientists are embracing such a broad view. In March, for example, they came together at the first Global Conference on Agricultural Research to begin working out how to change research agendas to help meet the needs of farmers in poorer nations. But these plans will not bear fruit unless they get considerably more support from policy-makers. The growth in public agricultural-research spending peaked in the 1970s and has been shrinking ever since. The big exception is China, where spending has far surpassed other countries over the past decade. China seems set to transition to become the key supplier of relevant science and technology to poorer countries. But developed countries have a humanitarian responsibility, too. Calls by scientists for large increases in the appropriation of funds for public spending on agricultural research are more than justified. 22.What is an urgent need for feeding the world’s population in 2050, according to the speaker? 23.Where should most of the money be invested to feed the ever-growing population? 24.Why does the speaker give credit to the world’s agricultural scientists? 25. What makes China exceptional in comparison with the rest of the world?讲话中提到，为了迎接2050年的挑战，投资金额必须翻一番，即每年需投入830亿美元。其中的大部分资金需要用于改善农业基础设施。因此，选项A的说法与讲话内容一致，故为正确答案。讲话者在提到“作物轮作”时说，同样重要的是对诸如作物轮作和小型农场动植物混养等基础知识的低端技术研究，但并未点明是哪一类国家才需要，选项D错误。其余两个选项讲话均未体现，可排除。
【正确答案】
B
【答案解析】原文： Good morning, class. My topic today is how to feed a hungry world. The world’s population is expected to grow from 6.8 billion today to 9.1 billion by 2050. Meanwhile, the world’s population more than doubled from 3 billion between 1961 and 2007. Simultaneously, food production has been constrained by a lack of scientific research. Still, the task of feeding the world’s population in 2050 seems "easily possible". What is needed is a second green revolution. This is an approach that is described as the sustainable growth of global agriculture. Such a revolution will require a wholesale shift of priorities in agricultural research. There is an urgent need for new crop varieties. They must offer higher yields, but use less water, nitrogen-rich fertilizers or other inputs. These new crops must also be more resistant to drought, heat and pests. Equally crucial is lower-tech research into basics such as crop rotation and mixed farming of animals and plants on small farms. Developing nations could score substantial gains in productivity by making better use of modern technologies and practices. But that requires money. It is estimated that to meet the 2050 challenge, investment must double to $83 billion US dollars a year. Most of that money needs to go towards improving agricultural infrastructure. Everything from production to storage and processing must improve. However, research agendas need to be focused on the needs of the poorest and most resource-limited countries. It is there that most of the world’s population lives, and it is there that population growth over the next decades will be the greatest. To their credit, the world’s agricultural scientists are embracing such a broad view. In March, for example, they came together at the first Global Conference on Agricultural Research to begin working out how to change research agendas to help meet the needs of farmers in poorer nations. But these plans will not bear fruit unless they get considerably more support from policy-makers. The growth in public agricultural-research spending peaked in the 1970s and has been shrinking ever since. The big exception is China, where spending has far surpassed other countries over the past decade. China seems set to transition to become the key supplier of relevant science and technology to poorer countries. But developed countries have a humanitarian responsibility, too. Calls by scientists for large increases in the appropriation of funds for public spending on agricultural research are more than justified. 22.What is an urgent need for feeding the world’s population in 2050, according to the speaker? 23.Where should most of the money be invested to feed the ever-growing population? 24.Why does the speaker give credit to the world’s agricultural scientists? 25. What makes China exceptional in comparison with the rest of the world?讲话中提到，研究议程要重点关注最贫穷国家和资源最有限国家的需求。值得赞扬的是，全球农业科学家支持这个宏观的视角。接着以第一届全球农业研究会议为例说明，全球的农业科学家云集在此研究如何改变研究议程，帮助满足较贫穷国家农民的需求。故选项B的说法与讲话内容一致，为正确答案。其余三个选项讲话中均未提及，可排除。
【正确答案】
C
【答案解析】原文： Good morning, class. My topic today is how to feed a hungry world. The world’s population is expected to grow from 6.8 billion today to 9.1 billion by 2050. Meanwhile, the world’s population more than doubled from 3 billion between 1961 and 2007. Simultaneously, food production has been constrained by a lack of scientific research. Still, the task of feeding the world’s population in 2050 seems "easily possible". What is needed is a second green revolution. This is an approach that is described as the sustainable growth of global agriculture. Such a revolution will require a wholesale shift of priorities in agricultural research. There is an urgent need for new crop varieties. They must offer higher yields, but use less water, nitrogen-rich fertilizers or other inputs. These new crops must also be more resistant to drought, heat and pests. Equally crucial is lower-tech research into basics such as crop rotation and mixed farming of animals and plants on small farms. Developing nations could score substantial gains in productivity by making better use of modern technologies and practices. But that requires money. It is estimated that to meet the 2050 challenge, investment must double to $83 billion US dollars a year. Most of that money needs to go towards improving agricultural infrastructure. Everything from production to storage and processing must improve. However, research agendas need to be focused on the needs of the poorest and most resource-limited countries. It is there that most of the world’s population lives, and it is there that population growth over the next decades will be the greatest. To their credit, the world’s agricultural scientists are embracing such a broad view. In March, for example, they came together at the first Global Conference on Agricultural Research to begin working out how to change research agendas to help meet the needs of farmers in poorer nations. But these plans will not bear fruit unless they get considerably more support from policy-makers. The growth in public agricultural-research spending peaked in the 1970s and has been shrinking ever since. The big exception is China, where spending has far surpassed other countries over the past decade. China seems set to transition to become the key supplier of relevant science and technology to poorer countries. But developed countries have a humanitarian responsibility, too. Calls by scientists for large increases in the appropriation of funds for public spending on agricultural research are more than justified. 22.What is an urgent need for feeding the world’s population in 2050, according to the speaker? 23.Where should most of the money be invested to feed the ever-growing population? 24.Why does the speaker give credit to the world’s agricultural scientists? 25. What makes China exceptional in comparison with the rest of the world?讲话者在最后提到，农业研究公共支出的增长在20世纪70年代达到顶峰，此后一直在缩减。中国与此格外不同，在过去十年中，中国在农业研究方面的支出远远超过了其他国家。因此，选项C的说法与讲话内容一致，为正确答案。讲话末尾提到，发达国家也负有人道主义责任，too一词表明不管是发展中国家还是发达国家都负有人道主义责任，因此在承担人道主义责任方面，中国并非与众不同，而是与其他国家协同一致，故选项B错误。其余两个选项讲话中均未提及，可排除。讲话中提及中国对外供应的部分是说中国似乎在朝提供农业相关科技的方向发展，而不是粮食本身。