吸烟有害健康是众所周知的说法，如何在烟盒上做出恰当的警示，从而有效降低人们尤其是青少年的吸烟欲望，却很不容易。加拿大规定，每一条香烟都必须从政府规定的16种警示语中选择至少6种，并且要经常更换；最好不用大字标题，不得出现“禁止向未成年人销售”字句。 这种做法是以下面哪项为前提假设的？（） Ⅰ.用语气生硬的大字标题容易引起青少年的逆反心理 Ⅱ.“禁止向未成年人销售”字句会被青少年认为“香烟是成年人的专用品”而更加起劲地尝试 Ⅲ.过分强调吸烟有害健康会引起烟草企业的反对 Ⅳ.警示语经常更换以免被当成老生常谈或出现过期消息 正确。 错误。
氨水的PH值（）。 正确。 错误。
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 better瞫tocked 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16处填上正确答案（） 正确。 错误。
政治教导员、政治指导员具体组织本单位的思想政治教育，掌握官兵思想，（），搞好随机教育。 正确。 错误。
我国股票市场的最重要的组成部分是（） 正确。 错误。
在重大旅游安全事故发生后，报告单位应当立即派人赶赴现场，组织抢救工作，并及时报告当地公安部门。
