首页
登录
职称英语
Some of the world’s most significant problems never hit headlines. One examp
Some of the world’s most significant problems never hit headlines. One examp
游客
2024-01-28
21
管理
问题
Some of the world’s most significant problems never hit headlines. One example comes from agriculture. Food riots and hunger make news. But the trend lying behind these matters is rarely talked about. This is the decline in the growth in yields of some of the world’s major crops. A new study by the University of Minnesota and McGill University in Montreal looks at where, and how far, this decline is occurring.
The authors take a vast number of data points for the four most important crops: rice, wheat, corn and soyabeans(大豆). They find that on between 24% and 39% of all harvested areas, the improvement in yields that took place before the 1980s slowed down in the 1990s and 2000s.
There are two worrying features of the slowdown. One is that it has been particularly sharp in the world’s most populous(人口多的)countries, India and China. Their ability to feed themselves has been an important source of relative stability both within the countries and on world food markets. That self-sufficiency cannot be taken for granted if yields continue to slow down or reverse.
Second, yield growth has been lower in wheat and rice than in corn and soyabeans. This is problematic because wheat and rice are more important as foods, accounting for around half of all calories consumed. Com and soyabeans are more important as feed grains. The authors note that " we have preferentially focused our crop improvement efforts on feeding animals and cars rather than on crops that feed people and are the basis of food security in much of the world. "
The report qualifies the more optimistic findings of another new paper which suggests that the world will not have to dig up a lot more land for farming in order to feed 9 billion people in 2050, as the Food and Agriculture Organisation has argued.
Instead, it says, thanks to slowing population growth, land currently ploughed up for crops might be able to revert(回返)to forest or wilderness. This could happen. The trouble is that the forecast assumes continued improvements in yields, which may not actually happen. [br] What does the new study by the two universities say about recent crop improvement efforts?
选项
A、They fail to produce the same remarkable results as before the 1980s.
B、They contribute a lot to the improvement of human food production.
C、They play a major role in guaranteeing the food security of the world.
D、They focus more on the increase of animal feed than human food grains.
答案
D
解析
推理判断题。由第四段第四句可知,研究者们认为人们偏向专注于提高喂养动物和为汽车提供能源的农作物的产量,而不是能养活人类的农作物的产量,故答案为D)“他们更加关注动物饲料而不是人类粮食产量的增加”。
转载请注明原文地址:https://tihaiku.com/zcyy/3401453.html
相关试题推荐
Forthispart,youareallowed30minutestowriteanessayonproblemsofurban
[originaltext]Criticismofresearchlaysasignificantfoundationforfuture
[originaltext]Criticismofresearchlaysasignificantfoundationforfuture
Forthispart,youareallowed30minutestowriteanessayonproblemsofurban
Someoftheworld’smostsignificantproblemsneverhitheadlines.Oneexamp
Someoftheworld’smostsignificantproblemsneverhitheadlines.Oneexamp
Someoftheworld’smostsignificantproblemsneverhitheadlines.Oneexamp
[originaltext]Criticismofresearchlaysasignificantfoundationforfuture
[originaltext]Criticismofresearchlaysasignificantfoundationforfuture
[originaltext]Criticismofresearchlaysasignificantfoundationforfuture
随机试题
姓名:刘小宇男1983年12月25日出生未婚2005年毕业于新华学院自动化系。各门功课都很优秀。有较好的英语听说读写能力和一定法语语音基础。同时对管理理
危险度管理中依据的主要是()A.毒理学试验 B.危险度评定 C. D.
关于深Ⅱ度烧伤的临床表现,下列错误的是A.可见树枝状栓塞血管 B.创面多有水疱
《学记》中“古之王者,建国居民,教学为先”所强调的是( )。A.教育对文化的作
证券市场中介机构是指()。A.从事证券的发行与交易的机构 B.为证券的发行、
飞机数量计划主要内容是()。A.确定飞机的需要量 B.确定飞机的质量 C.确
《二泉映月》是用下列哪一种乐器演奏的?()A.古筝 B.二胡 C.板胡
承担支持进出口贸易融资任务的政策性银行是()。A.国家开发银行 B.中国农
某公司正在论证新建一条生产线项目的可行性。经测算,项目的经济寿命5年,项目固定资
不属于治疗类风湿关节炎的药物是A.双氯芬酸钠 B.青霉素 C.雷公藤多苷片
最新回复
(
0
)