单项选择题
A．transforming poisoned rain B．consulting infrared scanning experts C．resorting to spot-spraying D．detecting crop problems at an early date
A．the lack of official support B．its high cost C．its failure to help increase production D．the lack of financial support
A．growing concern about the excessive use of pesticides on crops B．the desire of farmers to improve the quality of their produce C．the forceful promotion by the Department of Agriculture D．full support from agricultural experts