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计算题：对某一景观进行调查时，在景观中设置了20个样地进行调查两种景观要素A和B的相关性。结果为：A、B两种景观要素都有的样方数为6，有B景观要素无A景观要素的样方数为4，有A景观要素无B景观要素的样方数为5，A、B景观要素全无的样方数为5。试问景观中A、B两种景观要素是正关联性还是负关联？
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阅读理解：请根据短文内容，为每题确定l个最佳选项。 How We Form First Impression。 We all have first impression of someone we just met. But why? Why do we form an opinion about someone without really knowing anything about him or her - aside perhaps from a few remarks or readily observable traits? The answer is related to how your brain allows you to be aware of the world. Your brain is so sensitive in picking up facial traits. Even very minor difference in how a person’s eyes, ears, nose, or mouth are placed in relation to each other makes you see him or her as different. In fact, your brain continuously processes incoming sensory information - the sights and sounds of your world. These incoming signals are compared against a host of “memories” stored in the brain areas called the cortex(皮质) system to determine what these new signals “mean”. If you see someone you know and like at school, your brain says “familiar and safe”. If you see someone new, it says, “new and potentially threatening”. Then your brain starts to match features of this strangers with other “known” memories. The more unfamiliar the characteristics, the more your brain may say, “This is new, I don’t like this person” Or else, “I’m intrigued(好奇的)”. Or your brain may perceive a new face but familiar clothes, ethnicity, gestures - like your other friends; so your brain says: “I like this person”. But these preliminary impressions can be dead wrong. When we stereotype people, we use a less mature form of thinking (not unlike the immature thinking of a very young child) that makes simplistic and categorical impressions of others. Rather than learn about the depth and breadth of people - their history, interest, values, strengths, and true character - we categorize them as jocks(骗子), peeks(反常的人), or freaks(怪人). However, if we resist initial stereotypical impressions, we have a chance to be aware of what a person is truly like. If we spend time with a person, hear about his or her life, hopes, dreams, and become aware of our cortex, which allow us to be humane.Our first impression of someone new is influenced by his or her______.
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2011年10月，中国共产党十七届六中全会审议通过了《中共中央关于深化文化体制改革、推动社会主义文化大发展大繁荣若干重大问题的决定》，提出了推动社会主义文化大发展大繁荣的根本任务是（）。
某石化助剂总厂违章动火油罐爆炸。事故经过：2000年7月1日，为解决柴油存放一段时间后，由棕黄色谈深灰色的质量问题，某厂领导决定采用脱色技术，在柴油罐间加活性剂罐、混合罐、管道泵，将307#罐、308#罐的柴油，经管道泵注入混合罐，同来自活性剂罐的活性剂混合脱色后，注入204#罐储存外销。分管生产的副厂长直接安排生产设备部牵头，由机动车间维修班负责焊接安装。整个作业，采用先将混合罐、活性剂罐、管道泵定位后，再对接同柴油罐相连接的阀门、法兰、管道，现场进行焊接的方法。7月2日上午，已将混合罐、活性剂罐、管道泵定位，并同308#罐对连焊接完毕，下午继续进行同204#罐的对接。18时45分，在焊接同204#罐相接的管道时发生爆炸，204#罐罐体炸飞，南移3.5m落下，罐内柴油飞溅着火，同时204#罐罐体飞起时，又将该罐同307#罐之间的管道从307#罐根部阀前撕断，307#罐中400余吨柴油从管口喷出着火，现场施工的10人，突然被柴油烈火掩盖，瞬间即被烧死。307#罐在204#罐爆炸起火后45分钟，再次发生爆炸，罐底焊缝撕开12m左右，罐内剩余柴油急速涌出，着火的柴油顺混凝土地面，流至附近的10间操作室，操作室被烧毁；流至装置管排底部，管排管架被烧塌；流至厂区大门以外，将部分大树烧死。大火于20时45分被扑灭，没有造成罐区其他汽油、柴油罐的爆炸，避免了更大的损失。经向曾在现场的职工了解，事故是在焊接同204#罐底部Dg80闸板阀对接的管道时发生的。而204#罐盛过柴油，但已长时间没用了，只偶尔当作生产中吹扫管道时的储气罐用。但在阀门以下，有24cm深，约15m2放不出来的柴油，而阀门以上无油。经察看，204#柴油罐底部Dg80闸板阀阀瓣靠近罐体一侧有明显的暗红色铁锈，仅在底部有一弦高10cm左右的弯月形面，呈现高温后的蓝灰色，而阀瓣面向焊接的一侧，明显活动但留有间隙。该次动火没有用火手续。施工人员制作了盲板，带到了现场，没有使用，但是关闭了阀门。请分析事故原因，制定预防措施。
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