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Shopping habits in the United States have changed greatly in the last quarter of the 20th century. （1） in the 1900s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was （2） on both sides with many （3） businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. （4）,some shops offered （5） .These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. （6） in the 1950s, a change began to （7） .Too many automobiles had crowded into Main Street （8） too few parking places were （9） shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces （10） the city limits. Open space is what their car-driving customers needed. And open space is what they got （11） the first shopping centre was built. Shopping centres, or rather malls, （12） as a collection of small new stores （13） crowded city centres. 14 by hundreds of free parking space, customers were drawn away from （14） areas to outlying malls. And the growing （16） of shopping centres led （17） to the building of bigger and betterstocked stores. （18） the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the （19） of one stop shopping, malls were transformed into landscaped parks, （20）benches, fountains, and outdoor entertainment. 请在17处填上正确答案（）
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直方图的主要目的是？（）
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"您感到胃疼多长时间了？"属于（）提问
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吸宫不全的处理正确的是（）
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在接管期间，被接管的保险公司的债权债务关系（）。
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一团干空气，其露点温度td及饱和水汽压E的情况是（）。
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中亚和伊朗的清真寺为哪两种基本型制？哪几座是代表作？
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某老年女性，既往有哮喘病史多年。平素呼吸浅短难续，声低气怯，咳嗽痰白如沫，胸闷心慌，形寒汗出，舌淡紫，脉沉细。该老年患者，若不及时控制病情，极易发生下述变证，除外（）
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需求分析的基本要求是什么？
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在温度、负载、电源电压、机械振动等因素中，对LC振荡器频率稳定性影响最大的是（）。