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 form a thick layer of ice that will break the trees branches. 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 temperatures drop 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 well all have the benefits of computerage oranges.

　　The passage is mainly about_______.

　　A a farmers expert care for his orange trees

　　B the different uses of computers

　　C growing oranges in Floridas changeable weather

　　D different way of frost protection

　　15 RALOALTO, CaliforniaSwitching off the television may help prevent children from getting fattereven if they do not change their diet or increase the amount they exercise, US researchers said last week.

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