题目内容
房地产具有供给有限特性，本质上是由于( )决定。
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In the early days of sea travel, seamen on long voyages lived exclusively on salted meat and biscuits. Many of them died of scurvy (坏血病), a disease of the blood which causes swollen gums, livid white spots on the flesh and general exhaustion. On one occasion, in 1535, an English ship arrived in Newfoundland with its crew desperately iii. The men’s lives were saved by Iroquois Indians who gave them vegetable leaves to eat. Gradually it came to be realized that scurvy was caused by some lack in the sailors’ diet and Captain Cook, on his long voyages of discovery to Australia and New Zealand, established the fact that scurvy could be warded off by the provision of fresh fruit for the sailors.Nowadays it is understood that a diet which contains nothing harmful may yet result in serious disease if certain important elements are missing. These elements are called "vitamins". Quite a number of such substances are known and they are given letters to identify them, A, B, C, D, and so on. Different diseases are associated with deficiencies of particular vitamins. Even a slight lack of Vitamin C, for example, the vitamin most plentiful in fresh fruit and vegetables, is thought to increase significantly our susceptibility(敏感度) to colds and influenza.The vitamins necessary for a healthy body are normally supplied by a good mixed diet, inclu- ding a variety of fruit and green vegetables. It is only when people try to live on a very restricted diet, say during extended periods of religious fasting(斋戒), or when trying to lose weight, that it is necessary to make special provision to supply the missing vitamins. Which of the following sentences best expresses the central idea of the passage（）
我国规划体系中，企业自主编制的发展规划( )。
房地产价格与一般物品价格的( )表现出房地产价格的独特之处。
When the time comes for anthropologists to turn their attention to the twentieth century, they will surely choose the label "Legless Man". Histories of the time will go something like this: In the twentieth century, people forgot how to use their legs. Men and women moved about in cars, buses and trains from a very early age. But ’the surprising thing is that they didn’t use their legs even when they went on holiday. They built cable railways, ski-lifts and roads to the top of every huge mountain.The future history books might also record that we were deprived of the use of our eyes. Inourhurry to get from one place to another, we failed to see anything on the way. Air travel gives you a bird’s eye view of the world. When you travel by car or train a blurred image of the country- side constantly smears the windows. Car drivers, in particular, are forever obsessed with the urge to go on and on: they never want to stop.When you travel at high speeds, the present, means nothing: you live mainly in the future because you spend most of your time looking forward to arriving at some other place. But actual arrival, when it is achieved, is meaningless. For the traveler on foot, on the other hand, traveling and arriving is the same thing: he arrives somewhere with every step he makes. At the end of his journey he feels a delicious physical weariness. He knows that sound. Satisfying sleep will be his: the just reward of all true travelers. Traveling at high speed means（）
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