1997年06月英語四級試題（閱讀）3

26. 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
    27. In order to apply pesticide spraying precisely, we can use infrared scanning to ______.
    A) estimate the damage to the crops
    B) draw a color-coded map
    C) measure the size of the affected area
    D) locate the problem area
    28. 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 at an early date
    29. 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
    30. 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