請依下文回答第 56 題至第 60 題: Most traditional older fire departments in larger U.S. central cities use Fire engine red for their fire engines. 56 ,
many suburbs and smaller cities now use the color lime or bright yellow for their fire engines because of its greater
visibility at night. The 57 research into fire appliance visibility was conducted by the City of Coventry (UK) Fire
Brigade and Lanchester College of Technology in 1965. This research 58 that under the range of artificial street
lighting in common use at the time yellow more generally retained its great visibility under a variety of lighting color
renderings. It was also more 59 in general road conditions in day time and during stormy weather. Research
conducted by Dr. Stephen Solomon, a New York optometrist, promoted the use of “lime yellow” in the United States
from the mid-1970s. Further research that 60 the use of yellow for emergency vehicles generally was published
in 1978 in Australia. It found that the more brightly colored fire apparatus suffered a lower accident rate than the less
brightly colored vehicles (red) used by the same fire department.
【題組】59
(A)conspicuous
(B)obscure
(C)subtle
(D)puzzling