单项选择题

Plants will emit an increased amount of heat when they are（）

A．sprayed with pesticides
B．in pour physical condition
C．facing an infrared scanner
D．exposed to excessive sun rays

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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
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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