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 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 color-coded map showing where plants were running" fevers". Farmers could then spot-spray, using 50 to 70 percent less p
A. estimate the damage to the crops
B. draw a color-coded map
C. measure the size of the affected area
D. locate the problem area
A few ways Greyhound can make your next trip even easier.Tickets By mail. Avoid lining up altogether, by purchasing your tickets in advance, and having them delivered right to your mailbox. Just call Greyhound at least ten days before your departure (1 - 800 - 231 - 2222). Prepaid tickets. it’s easy to purchase a ticket for a friend or family member no matter how far away they may be. Just call or go to your nearest Greyhound terminal(车站) and ask for details on how to buy a prepaid ticket. Ticketing Requirement. Greyhound now requires that all tickets have travel dates fixed at the time of purchase. Children under two years of age travel free with an adult who has a ticket. If your destination(目的地) is to Canada or Mexico. Passengers traveling to Canada or Mexico must have the proper travel documents. U. S. , Canadian or Mexican citizens should have a birth certificate, passport or naturalization (入籍) paper.
A. American citizens
B. Japanese citizens
C. Mexicans citizens
D. Canadians citizens
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