Cheverons, scientists say, not only give drivers the impression that they are driving faster than they really are, but also make a lane appear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.

　　The passage mainly discusses ________.

　　A a new way of highway speed control

　　B a new pattern for painting highways

　　C a new way to training drivers

　　D a new type of optical illusion

　　14 Farmer ED Rawlings smiles as he looks at his orange trees. The young oranges are growing well in Floridas weather. Warm sunshine and gentle rains, along with ED Rawlings expert care, will produce a good crop of oranges this year.

　　But ED has to fight against Floridas changeable winter weather. In January and February, temperature can destroy EDs entire orange crops. Having farmed in Florida for the past 35 years, Ed Rawlings is prepared for the frosts. When temperatures drop below freezing, Ed tries to save his crop by watering his orange trees. The water freezes and forms a thin layer of ice on the trees. Strange as it may sound, this thin layer of ice actually keep the fruit warm..

　　What happens is simple. When the trees are watered, the water loses heat and becomes ice. The warmth of the heat it loses is sicked in by the fruit and keeps its temperature at a safe level. Ed Rawling has effectively used this method to save many orange crops.

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