51.Plants will send out an increased amount of heat when they are________.
A.facing an infrared scanner
B.sprayed with pesticides
C.in poor physical condition
D.exposed to excessive sun rays
52.In order to apply pesticide spraying precisely, we can use infrared scanning to________.
A.estimate the damage to the crops
B.draw a colourcoded map
C.measure the size of the affected area
D.locate the problem area
53.Farmers can save a considerable amount of pesticide by________.
A.resorting to spotspraying
B.transforming poisoned rain
C.consulting infrared scanning experts
D.detecting crop problems at an early stage
54.The application of infrared scanning technology to agriculture met with some difficulties—________.
A.its high cost
B.the lack of official support
C.the lack of financial support
D.its failure to help increase production51.C 52.D 53.A 54.C
“In only six days I lost seven pounds of weight.”
“Two full inches in the first three days!”
These are the kinds of statements used in magazine,newspaper,radio and television ads,promising new shapes and new looks to those who buy the medicine or the device. The promoters of products say they can shape the legs,slim the face,smooth wrinkles,or in some other way to add to beauty or desirability.
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