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
专升本
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
2011-06-28
18
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 (红外线) 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 pre-cisely target pesticide (杀虫剂) spraying rather than rain poison on a whole field, which in- variably includes plants that don’t have pest (害虫) problems.
Even better, Paley’s Remote Scanning Services Company could detect crop problems be- fore they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infra- red scanner measured the heat emitted by crops. The data were transformed into a color-code map showing where plants were running" fevers". Farmers could then spot-spray, using 50 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 Agricultrue, thinks re- mote 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.
The application of infrared scanning technolgy to agriculture met with some difficulties due to ______.
选项
A、the lack of official support
B、its high cost
C、its failure to help increase production
D、the lack of financial support
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/ExlC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Accordingtothepassage,beesarefittedforcommunallifebyvirtueoftheir______.Itcanbeinferredfromthepassagethat
(Terrifiedbythethoughtthatshewashavingaheartattack),Maryscreamedforhelp.
Theyfinditimpossibletoexpress______likeangerortenderness.
Therewasonethoughtthatairpollutionaffectedonlytheareaimmediatelyaroundlargecitieswithfactoriesandheavyautomob
(Insomedevelopedcountries)theconsumptionofcigaretteshasbecomemoreorlessstabilized.
He______liveinaremoteandunderdevelopedcountrythaninthismodembutnoisycity.
—Iheardyoualmostmissedthetrain.—Yes.Igottotherailwaystationwithonlyfiveminutesto___.
Inordertolearnaforeignlanguagewell,itisnecessarytoovercomethefearofmakingmistakes.Iftheprimarygoal(目标)of
Inordertolearnaforeignlanguagewell,itisnecessarytoovercomethefearofmakingmistakes.Iftheprimarygoal(目标)of
Recently,severalthousandcomputersintheUnitedStateswereattackedbyavirus.Thecomputerswereslowedorshutdown.But
随机试题
下列关于鼠标的说法中,错误的是()
木瓜酶水解IgG的产物是
下列主体中,不必提取风险准备金的是()。
关于MM定理,以下说法不正确的是()。
资料1:1948年8月19日,当时的国民政府颁布《财政经济紧急处分令》,发行金圆券。实施该项金融改革的目的之一是解决财政困难。因为当时的财政已经到了山穷水尽的地步。金圆券改革的主要内容:以金圆券代替法币,法币必须在当年11月20口前兑换为金圆券,金圆券
教学过程是一种特殊的认识过程,主要以传授()。
我国对法律溯及力问题实行的原则是()。
求
Celui_____chantelemieuxestmonélève.
A、Sheignoredwomen’seducation.B、Shewassearchingforequalitybetweenmenandwomen.C、Sheopposedteachingwomenknowledge.
最新回复
(
0
)