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题目：
单选题
A多用纸巾，少用手絹
B电器不用时也保持通电
C循环使用生活用水
D保持良好卫生习惯，塑料袋只用一次
答案：
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区域产业结构
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56岁妇女，绝经4年，阴道浆液血性分泌物伴臭味3个月，查宫颈正常大、光滑，子宫稍大稍软本例的治疗方针应是（）
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在可摘局部义齿设计中，固位和稳定效果最好的卡环是（）
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叙述一下蒸发压力控制系统的控制原理。
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老年性耳聋的特点为（）
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班轮运输中件杂货进出口业务的主要单证有哪些？
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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11处填上正确答案（）
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下运皮带机常因过压的跳闸，怎么办？
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寄生虫感染时，浸润的炎症细胞主要是（）。