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
2015-01-09
69
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 Other 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.
In order to apply pesticide spraying precisely, we can use infrared scanning to_____.
选项
A、estimate the damage to the crops
B、measure the size of the affected area
C、draw a color-coded map
D、locate the problem area
答案
D
解析
依据文章第二段第四行,说明目的是确定有问题的区域,以使农民有针对性地使用杀虫剂。
转载请注明原文地址:https://kaotiyun.com/show/s1LO777K
0
考博英语
相关试题推荐
Thecolorandsmellofwaterintheserivers______itselfhowseriousthepollutionisbutmanypeoplearestillignoringthefac
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Intheearly20thcentury,attheadventofthetelephone,itwasconsideredasuperfluousinstrumentwhichwouldneverbeofpr
TheattackonFortSumternearCharleston______asharpresponsefromtheNorth,whichledtotheAmericanCivilWar.
Mr.Scottaskedforanassistantbecausehisworkloadwastoo______.
Thepolicemantriedto______theteenagedrivertoobeythetrafficlawsratherthanfinehimdirectly.
Thesizeoftheaudience,______wehadexpected,waswelloveronethousand.
He’swatchingTV?He’s______tobecleaninghisroom.
71.Vacationswereoncetheprerogativeoftheprivilegedfew,evenaslateasthe19thcentury.Nowtheyareconsideredtherig
Itusedtobesostraightforward.Ateamofresearchersworkingtogetherinthelaboratorywouldsubmittheresultsoftheirres
随机试题
对生物圈的范围描述有误者是
某市建筑公司承建某县城一商务楼,当年结算工程价款收入为5300万元,其中包括所安装设备的价款500万元及付给分包方的价款为300万元,则此收入应缴纳的营业税为()万元。
某公司期初的所有者权益为:股本5000万元(面值为1元),资本公积1000万元(其中股本溢价800万元),盈余公积500万元,未分配利润600万元。本期经董事会批准以每股7元的价格回购本公司股票200万股并按期注销。下列各项中,该公司回购并注销股票的相
某企业长期持有A股票,目前每股现金股利2元,每股市价20元,在保持目前的经营效率和财务政策不变,且不从外部进行股权融资的情况下,其预计收入增长率为10%,则该股票的股利收益率和期望报酬率分别为()。
道德行为属于外部表现,不属于品德的心理成分。
根据下列资料。回答以下问题。2013年第一季度,我国船舶进出口总额78.54亿美元,同比下降27%。其中船舶产品出口总额为72.91亿美元,同比下降29.6%。1—3月,我国船舶产品出口中出口数额最大的船型是散货船,出口额达到36.8亿美元,在船舶产品
在数1,,…中求出最大值.
People’sfinancialhistoryhasastrongimpactontheirtasteforrisk.LookingatsurveysofAmericanhousehold【C1】______from1
(1)Afterthirtyyearsofmarriedhappiness,hecouldstillremindhimselfthatVictoriawasendowedwitheverycharmexceptthe
SinceAndrewBentongraduatedfromcollegelessthanfouryearsago,hehasdroppedoutofaPrincetonPh.D.programineconomic
最新回复
(
0
)