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______是专门用来进行数据检索，以及便于以后进行数据加工的一种重要的数据库对象。
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Thanksgiving Day is the most truly American of the national holidays in the United States and is most closely connected with the earliest history of the country. In 1620, the settlers, or Pilgrims, sailed to America on the May Flower, seeking a place where they could have freedom of worship. After a two-month voyage, in icy November, they landed at what is now Plymouth, Massachusetts. During their first winter, over half of the settlers died of starvation or epidemics (流行病). Those who survived began sowing in the first spring. All summer long they waited for the harvests with great anxiety, knowing that their lives and the future of the colony depended on the coming harvest. Finally the fields produced a yield rich beyond expectations. And therefore it was decided that a day of thanksgiving to the Lord be fixed. Years later, President of the United States declared the fourth Thursday of November as Thanksgiving Day every year. The celebration of Thanksgiving Day has been observed on that date until today. The pattern of the Thanksgiving celebration has never changed through the years. The big family dinner is planned months ahead. On the dinner table, people will find apples, oranges, chestnuts, walnuts and grapes. There will be plum pudding, mince pie, other varieties of food and cranberry juice and squash. The best and most attractive among them are roast turkey and pumpkin pie. They have been the most traditional and favorite food on Thanksgiving Day throughout the years. What is the meaning of ’observe’ in the fourth paragraph
Questions 18-21 are based on a conversation you are going to hear. What does Prof. Nelson’s assistant do
The Esky, a great Australian invention—it’s about as important to the Australian household as a BBQ (烧烤的野餐). How else would we move our carefully prepared food and drink around without having it spoilt. Though it is a regular problem with Esky, you also need to plan. If you haven’t had a freeze pack, then you’ll need to go out and buy a bag of ice (maybe even several bags of ice). Get a Portable Mini Fridge and you’ll save on the bags of ice as well as a good deal on cleaning time. The Portable Mini Fridge requires a 12V DC supply, and you’ll find this thermo electric cooler the best thing invented since sliced bread (near enough anyway). One thing this car fridge has over your average Esky—it’ll warm to 60—65℃... and it does all this without any environmental pollution. Apart from basic cleaning, this thermo electric warmer is largely non-wearing and maintenance-free. At last, an affordable mini fridge for your car or boat will help save those green vegetables or fruits better, also it will keep the shape of an ice cream, this may help you feel very happy. What are the features of this Portable Mini Fridge
The Esky, a great Australian invention—it’s about as important to the Australian household as a BBQ (烧烤的野餐). How else would we move our carefully prepared food and drink around without having it spoilt. Though it is a regular problem with Esky, you also need to plan. If you haven’t had a freeze pack, then you’ll need to go out and buy a bag of ice (maybe even several bags of ice). Get a Portable Mini Fridge and you’ll save on the bags of ice as well as a good deal on cleaning time. The Portable Mini Fridge requires a 12V DC supply, and you’ll find this thermo electric cooler the best thing invented since sliced bread (near enough anyway). One thing this car fridge has over your average Esky—it’ll warm to 60—65℃... and it does all this without any environmental pollution. Apart from basic cleaning, this thermo electric warmer is largely non-wearing and maintenance-free. At last, an affordable mini fridge for your car or boat will help save those green vegetables or fruits better, also it will keep the shape of an ice cream, this may help you feel very happy. How did people move the already prepared food if they didn’t have freeze pack
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