首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In August, environmentalists in the Philippines vandalized(肆意破坏)a field of Golden Rice, an experimental grain whose genes had be
In August, environmentalists in the Philippines vandalized(肆意破坏)a field of Golden Rice, an experimental grain whose genes had be
admin
2017-02-24
55
问题
In August, environmentalists in the Philippines vandalized(肆意破坏)a field of Golden Rice, an experimental grain whose genes had been modified. Its seeds will be handed out free to farmers. The aim is to improve the health of children in poor countries by reducing vitamin A deficiency, which
contributes to
hundreds of thousands of premature deaths and cases of blindness each year.
Environmentalists claim that these sorts of actions are justified because genetically modified crops pose health risks. Now the main ground for those claims has crumbled. Last year a paper which was published in a respected journal found that unusual rates of tumours and deaths in rats that had been fed upon a variety of genetic modification(GM)(转基因)corn. Other studies found no such effects. But this one enabled campaigners to make a health-and-safety argument against GM crops—one persuasive enough to influence governments. After the study appeared, Russia suspended imports of the grain in question. Kenya banned all GM crops. And the French prime minister said that if the results were confirmed he would press for a Europe-wide ban on the GM corn.
There is now no serious scientific evidence that GM crops do any harm to the health of human beings. There is plenty of evidence, though, that they benefit the health of the planet. One of the biggest challenges facing mankind is to feed the 9 billion-10 billion people who will be alive and richer in 2050. This will require doubling food production on roughly the same area of land, using less water and fewer chemicals. It will also mean making food crops more resistant to the droughts and floods that seem likely if climate change is as bad as scientists fear.
If the Green revolution had never happened, and yields had stayed at 1960 levels, the world could not produce its current food output even if it ploughed up every last acre of cultivable land. In contrast, GM crops boost yields, protecting wild habitat from the plough. They are more resistant to the vagaries of climate change, and to diseases and pests, reducing the need for agrochemicals. Genetic research holds out the possibility of breakthroughs that could vastly increase the productivity of farming.
Vandalizing GM field trials is a bit like the campaign of some religious leaders to prevent smallpox inoculations: it causes misery, even death, in the name of unscientific belief.
In 2050, one of the biggest challenges of mankind is______.
选项
A、to provide food for at least 9 billion people
B、to develop more cultivable land
C、to produce treble food on roughly the same area of land
D、to prevent droughts and floods
答案
A
解析
细节题。短文第三段第三句指出One of the biggest challenges facing mankind is to feed the 9 billion-10 billion people who will be alive and richer in 2050.即人类面临的最大挑战之一是到2050年,要为90~100亿人口提供粮食吃。故选项A正确。
转载请注明原文地址:https://kaotiyun.com/show/ADi7777K
0
大学英语四级
相关试题推荐
It’sverypopulartoseecollegeanduniversitystudentsspendingtheirvacationpartyinginawarmbarwithnoparentsaroundi
It’sverypopulartoseecollegeanduniversitystudentsspendingtheirvacationpartyinginawarmbarwithnoparentsaroundi
It’sverypopulartoseecollegeanduniversitystudentsspendingtheirvacationpartyinginawarmbarwithnoparentsaroundi
Thisiswhatpeopletalkaboutwhentheytalkaboutthefuture.Theytalkaboutthepast.Theytalkaboutits【B1】______andplea
Thisiswhatpeopletalkaboutwhentheytalkaboutthefuture.Theytalkaboutthepast.Theytalkaboutits【B1】______andplea
Thisiswhatpeopletalkaboutwhentheytalkaboutthefuture.Theytalkaboutthepast.Theytalkaboutits【B1】______andplea
A、Goldwasdiscoveredinthecity.B、Thecity’spopulationgrewtotwelvethousand.C、TheGoldenGateBridgewasconstructed.D、
InAugust,environmentalistsinthePhilippinesvandalized(肆意破坏)afieldofGoldenRice,anexperimentalgrainwhosegeneshadbe
A、Onemonthlater.B、Twomonthslater.C、Immediately.D、Twoweekslater.B细节推断题。由U.S.ForcesinJapanwasinformedoftheAugust
A、Goldwasdiscoveredinthecity.B、Thecity’spopulationgrewtotwelvethousand.C、TheGoldenGateBridgewasconstructed.D、
随机试题
已知α,1,β成等差数列,而1/α2,1,1/β2成等比数列,则的值为()。
Beingthe________sponsorofthiscompetition,hehasgotgreatopportunitiesforadvertisinghisproducts.
一个物流企业如何选择咨询培训外包组织?
2013年,我国物流运行总体平稳,物流需求规模保持较高增幅,物流业增加值平稳增长,但经济运行中的物流成本依然较高。2013年全国社会物流总额197.8万亿元,同比增长9.5%,增幅比上年回落0.3个百分点。分季度看,一季度增长9.4%,上半年增长
四个人在议论一位明星的年龄。甲说:她不会超过25岁。乙说:她不超过30岁。丙说:她绝对在35岁以上。丁说:她的岁数在40岁以下。实际上只有一个人说对了。那么下列正确的是()。
根据下列资料,回答下列问题。2009年1~8月,电子信息产业500万元以上投资项目完成固定资产投资2371.4亿元,同比增长15.8%,增速低于去年同期12.3个百分点,低于全国制造业水平11.5个百分点。从行业看,家用视听行业投资48.8亿元
以赫尔巴特为代表的“教师中心论”主张()。
简述货币危机的类型及其特点。
澳门特别行政区是中华人民共和国一个享有高度自治权的地方行政区域,直辖于()。
IntelligentandEnergy-savingSolarHomeA)Ifsomegroupgaveoutawardsfortheleastenergy-efficientstructures—thewaythose
最新回复
(
0
)