题目内容
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（霜）. 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 fruit and keeps its temperature at a safe level. Ed Rawlings 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 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 Rawlings 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 Rawlings 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.
(1) The passage is mainly about ________.
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A．a farmer's expert care for his orange trees
B．the different uses of computer
C．growing oranges in Florida's changeable weather
D．different ways of frost protection
(2) Ed tried to protect his crop by ________.
[ ]
A．using a wind machine to drive away the cold air
B．equipping his orange trees with a computer
C．watering it at the proper time
D．picking his fruit at the first sign of frost
(3) In the writer's eyes, computers ________.
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A．are too expensive for small farmers
B．can be a valuable tool for the farmer
C．can be used to help oranges grow bigger
D．cannot take the place of the farmer's experience and judgement
(4) Which of the following is NOT NECESSARY for Ed Rawlings to do?
[ ]
A．He should water the orange trees as soon as the temperature drops to the freezing point.
B．He should decide the quantity of water for the orange trees.
C．He has to water the orange trees more often in January and February.
D．He has to judge how often he should water the orange trees.
(5) According to the passage, the computer technology can ________.
[ ]
A．get rid of the need for frost protection
B．help the farmer get a better harvest
C．tell the farmer why outdoor temperature changes
D．prevent the temperature from dropping to the freezing point
解析：
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(1) 本题属于总结概括题。文章主要讲Ed Rawlings在照料橘子树时，电脑帮助他解决各方面的实际问题，故A项符合原文意思。(2) 本是考查细节，文中第二段“When temperatures drop below freezing, Ed tries to save his crop by watering his orange trees”一句告诉了本题答案。(3) 本题属于推理判断题。文章最后一段仍讲述电脑在农业方面的用途，由最后一句可知B项符合题意。(4) 本题属于综合分析判断题，从全文看，只有C项为不必要的事情（在种植和照料橘树方面）。(5) 本题是一道判断题。B项正是全文的中心所在，指电脑给农民带来了诸多的方便。 |
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