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
Even plants can run a fever, especially when they’re under attack by insects or disease. But unlike humans, plants can have thei
Even plants can run a fever, especially when they’re under attack by insects or disease. But unlike humans, plants can have thei
admin
2011-05-29
72
问题
Even plants can run a fever, especially when they’re under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3,000 feet away-- straight up. A decade ago, adapting the infrared scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide (杀虫剂) spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest (害虫) problems.
Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color-coded map showing where plants were running "fevers". Farmers could then spot-spray, using 40 to 70 percent less pesticide than they otherwise would.
The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long-term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. "This technique can be used on 75 percent of agricultural land in the United States," says George Oerther of Texas A&M. Ray Jackson, who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if Paley finds the financial backing which he failed to obtain 10 years ago.
Farmers can save a considerable amount of pesticide by ______.
选项
A、resorting to spot-spraying
B、consulting infrared scanning experts
C、transforming poisoned rain
D、detecting crop problems at an early stage
答案
A
解析
依据文章第二段最后一句。
转载请注明原文地址:https://kaotiyun.com/show/0j6O777K
0
考博英语
相关试题推荐
Lookatthelistbelow.Itshowspagesfromacompany’swebsiteontheInternet.Forquestions6-10,decidewhichstand(A-H)is
TourisminThailandIn1997therewereover7million(29)toThailand.Therewere(30)independenttravelers(up4.5%
TourisminThailandIn1997therewereover7million(29)toThailand.Therewere(30)independenttravelers(up4.5%
•Readthearticlebelowaboutasuccessfulbusinessman.•Foreachquestion(23-28)belowthearticle,choosethecorrectansw
•Readthearticleaboutthefutureoftheairlineindustry.•Choosethebestwordtofillineachgap,fromA,BorC.•Fore
Lookatthegraphsbelow.Theyshowtheclosingsharepricesattheendofeachday’stradingofeightdifferentcompaniesfrom
Readthearticleabouttheinterviewperformancebelow.ChoosethecorrectwordtofilleachgapfromA,BorC.Foreac
HowtosetpricesThemethodsadoptedinpricesettingarecrucialtoanybusiness.Whensettingprices,remembercostswill
Cosmicraysofvariouskindscomethroughtheairfromouterspace,butenormousquantitiesofradiationfromthesunare______o
随机试题
发包人收到承包人提交的最终结清申请单,并在规定时间内予以核实后,向承包人签发()。
在Word编辑状态下,通过( )可以选中整个文档内容。
陈先生与另一个合伙人在A市共同兴办了一家合伙企业甲,出资比例为5:5。2010年年初,陈先生向其主管税务机关报送了2009年度的所得税申报表和会计决算报表以及预缴个人所得税纳税凭证。该合伙企业年度会计报表反映:合伙企业2009年度的主营业务收入70万元,投
纸质书是一个多页共存的实体,一件有其完整物质形态的物品,由封面、扉页、目录、前言、主体、后记等要素构成,其本身就是一个占据一定空间的艺术品。这是纸质书与电子书的根本区别。在传递信息这一功能上,电子书与纸质书没有区别;但二者一是虚拟,一是实体,一是单面,一是
资本结构问题:375万现金流(EBIT),750万的债务,rB=10%,初始该公司想把提高到50%。(北京大学2017年真题)求相同公司(无负债/全权益)的R0。
某研究人员在2004年对一些12~16岁的学生:进行了智商测试,测试得分为77~135分。4年之后再次测试,这些学生的智商得分为87~143分。仪器扫描显示,那些得分提高了的学生,其脑部比此前呈现更多的灰质(灰质是一种神经组织,是中枢神经的重要组成部分)。
《中华人民共和国标准化法》将我国标准分为国家标准、地方标准等(35)级。
Text…【C1】______Thanksgivingturkey,it’shardtofind【C2】______"American"food.TheUnitedStatesisalandof【C3】______
一个成熟的公共服务系统一旦建立起来,它将成为社会持续发展的重要推动力量。
Thebraindrain(人才流失)isauniversalphenomenon,andcountriesthatdon’tfaceuptothenewrealitywillbelosingsomeofthe
最新回复
(
0
)