2. 自考
  3. Farmer Ed Rawlings smiles as he looks at his orange trees. The young oranges are growing well in Florida’s weather. Warm sunshin

Farmer Ed Rawlings smiles as he looks at his orange trees. The young oranges are growing well in Florida’s weather. Warm sunshin

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问题     Farmer Ed Rawlings smiles as he looks at his orange trees. The young oranges are growing well in Florida’s 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 Florida’s changeable winter weather. In January and February, temperatures can destroy Ed’s entire orange crop. 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(层)of ice on the trees. Strange as it may sound, this thin layer of ice actually keeps 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 sucked in by the it uit and keeps its temperature at a safe level. Ed has effectively used this method to save many orange crops.
    But Ed still faces some difficulties. The trees should be watered at the exact moment the temperature drops to the freezing point. Also, just the right quantity of water must be used. Too much water can forma thick layer of ice that will break the branches of the trees. Another difficulty is that wind blows away the heat. So Ed has to worry about not only when but also how often his trees should be watered, and how much water should be used.
    Computer technology may help Ed with some of these worries. With equipment, air and soil temperatures and wind speed can be measured. The information is fed into a computer which can tell when temperature drops to freezing. The computer can correctly decide the quantity of water to be used and how frequently the trees should be watered. Ed will find looking after his orange trees a lot easier with the help of a computer, and we’ll all have the benefits(or advantages)of computer-age oranges.  
The passage is mainly about______.
选项 A、a farmer’s expert care for his orange trees
B、the different uses of computers
C、growing oranges in Florida’s changeable weather
D、different ways of frost protection
答案A
解析 主旨题。虽然文章说到天气的变化和计算机的应用，但文章重点还是放在农民怎样种橘子上面。
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