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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单项选择题
Infrared scanning technology may be brought back into operation because of ______.
A．the desire of farmers to improve the quality of their produce
B．growing concern about the excessive use of pesticides on crops
C．the forceful promotion by the Department of Agriculture
D．full support from agricultural experts
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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