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案例分析题The purpose of （66） is to enlarge the （67） , the set of addresses a program can utilize. For example, it might contain twice as many addresses as main memory. A program using all of it, therefore, would not be able to fit in main memory all at once. Nevertheless, the computer could execute such a program by Copying into main memory those portions of the program needed at any given point during execution.To facilitate copying （67） into real memory, the operating system divides it into pages, each of which contains a fixed number of addresses. Each page is stored on a disk until ii is needed. When the page is needed, the operating system copies it from disk to main memory, translating the （68） into real addresses. The process of translating virtual addresses into real addresses is called （69） . The copying of virtual pages from disk to main memory is known as （70） or swapping. （68）处应选择（）
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3，8，18，33，53，（）。
按照顺序排列，正确的选项为（）。（1）云层小含有大量酸离子（2）安装滤清装置（3）引起有关部门重视（4）化工厂浓烟滚滚（5）树叶大面积枯黄
Tom: Dad, what will we have for dinnerDad: I don’t know. Maybe fried fish, chicken soup and...Tom: Oh, no. We’ve had such things since Mom’s gone.Dad: I’m sorry. But that is the only thing I can cook. What do you want to have thenTom: I’d like to go to McDonald’s this time.Dad: OK then. You’ll drive, will youTom: No, I’m a bit tired today. You do that, please.Dad: OK, OK. I always do things like that ... Ah, here we are.Tom: Dad, what do you want to have I’d like a hamburger.Dad: Hamburger, salad, coke and apple pie. Is that all right for you, TomTom: Right, and fetch me an ice-cream, too. I’ll go and find the seats.Dad: And I’ll get some vegetable for myself, and a coffee... Oh, I’ m afraid we’ll have to do some packing. What can you infer from the dialogue().
增值税：是指以商品流通和劳动服务在各个流转环节的增值额为征税对象的一种税。它是以商品销售额和应税劳务营业额为计税依据运用税收抵扣原则征收的一种流动税。它具有以下特征：（1）征收对象是法定的增值额；（2）税负公平合理，具有中性税属性。根据上述定义，下列情况中属于征收增值税的是（）。
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