第五讲 “藏而不露”的推理判断题
Test 1
(2013·湖北省荆州市高中毕业班质量检测Ⅰ)
Precision agriculture (精确农业) is a way of thinking about how to improve production and get more from existing resources.It often involves the use of technology.An example found mostly in wealthier countries is a computerguided tractor.The computer does most of the driving.It uses signals from satellites in the Global Positioning System.GPS technology helps the tractor cut rows in straight lines and put the right amount of fertilizer in the right place.
Jimmy Messick is a farmer in northern Virginia，not far from Washington.He says the GPS guidance system makes it easy to come back later and plant the seed in his fields of corn.Because of the GPS guidance，Messick now pays half what he once did for fertilizer.Bruce Erickson is an agronomist (农学家) at Purdue University in Indiana.He says saving even a little bit of seed，pesticide or fertilizer leads directly to expense savings and less environmental damage.
Raj Khosla is an agronomist at Colorado State University.He says farmers in the developing world can use precision agriculture even without hightech tractors.“We do not necessarily have to have complex，large machines to practice what could be done as simply as using bottle caps，” Mr Khosla says.The idea is to use a bottle cap to pour a measured amount of fertilizer right next to each plant.It takes more work than simply
