单项选择题

The application of infrared scanning technology to agriculture met with some difficulties due to ______.

A．the lack of official support
B．its high cost
C．the lack of financial support
D．its failure to help increase production
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单项选择题
Farmers can save a considerable amount of pesticide by ______.
A．resorting to spot-spraying
B．consulting infrared scanning experts
C．transforming poisoned rain
D．detecting crop problems a[ an early date
单项选择题
Plants will emit an increased amount of heat when they are ______.
A．sprayed with pesticides
B．facing an infrared scanner
C．in poor physical condition
D．exposed to excessive sun rays
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