单项选择题
Why did farmers reject Newbold's plow ( )
A．Their horses were frightened by it.
B．They preferred lighter tools.
C．It was too expensive.
D．They thought it would ruin the land.
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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
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