阅读理解Evenplantscanrunafever,especiallywhenthey'reunderattackbyinsectsor

阅读理解 Even plants can run a fever, especially when they're under attack by insects or disease. But unlike human, plants can have their temperature taken from 3,000 feet away—straight up. A decade ago, adopting 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 precisely target pesticide(杀虫剂)spraying rather than rain poison on a whole field, which invariably includes plants that don't have pest 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 colour­coded map showing where plants were running “fevers”. Farmers could then spot­spray, 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 long­term 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.1.Plants will send out an increased amount of heat when they are________.A.facing an infrared scannerB.sprayed with pesticidesC.in poor physical conditionD.exposed to excessive sun rays2.In order to apply pesticide spraying precisely, we can use infrared scanning to________.A.estimate the damage to the cropsB.draw a colour­coded mapC.measure the size of the affected areaD.locate the problem area3.Farmers can save a considerable amount of pesticide by________.A.resorting to spot­sprayingB.transforming poisoned rainC.consulting infrared scanning expertsD.detecting crop problems at an early stage4.The application of infrared scanning technology to agriculture met with some difficulties—________.A.its high costB.the lack of official supportC.the lack of financial supportD.its failure to help increase production

CDAC解析文章介绍了一种能通过红外线测量那些植物生病了的技术，来节约农药，提高生产效率。1.C 推理题。根据文章第一段可知当植物的情况不理想如受到昆虫的袭击的时候，也会生病，故C正确。2.Ｄ　细节题。根据第２段３,４,５三行The data were transformed into a colour­coded map showing where plants were running “fevers”. Farmers could then spot­spray, using 50 to 70 percent less pesticide than they otherwise would.可知这种扫描仪可以确定出问题的具体位置，可以定点喷洒农药，故Ｄ正确。3.Ａ　细节题。根据第２段３,４,５三行The data were transformed into a colour­coded map showing where plants were running “fevers”. Farmers could then spot­spray, using 50 to 70 percent less pesticide than they otherwise would可知Ａ正确。4.Ｃ　推理题。根据最后一句可知Ｃ正确。

就是这个解释