()1.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

()2.In order to apply pesticide spraying precisely, we can use infrared scanning to ________.

A．estimate the damage to the crops

B．measure the size of the affected area

C．draw a color­coded map

D．locate the problem area

()3.Farmers can save a considerable amount of pesticide by________.

A．resorting to spot­spraying

B．consulting infrared scanning experts

C．transforming poisoned rain

D．detecting crop problems at an early stage

()4.The application of infrared scanning technology to agriculture met with some difficulties—________.

A．the lack of official support

B．its high cost

C．the lack of financial support

D．its failure to help increase production

()5.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

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