单项选择题

Farmers can save a considerable amount of pesticide by ______. ( )

A．transforming poisoned rain
B．consulting infrared scanning experts
C．resorting to spot-spraying
D．detecting crop problems at an early date
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单项选择题
In order to apply pesticide spraying precisely, we can use infrared scanning to ______. ( )
A．locate the problem areas
B．drew a color-coded map
C．measure the size of the affected area
D．estimate the damage to the crops
单项选择题
The application of infrared scanning technolgy to agriculture met with some difficulties due to ______.( )
A．the lack of official support
B．its high cost
C．its failure to help increase production
D．the lack of financial support
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