题目内容
n个顶点e条边的图，若采用邻接矩阵存储，则空间复杂度为(____)，若采用邻接表存储，则空间复杂度为(____)。
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石油企业的经营管理要求不包括（）。
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Directions:Inthissection, thereisapassagewithtenblanks.Youarerequiredtoselect onewordforeachblankfromalistofchoicesgiveninawordbankfollowingthepassage. Youmaynotuseanyofthewordsinthebankmorethanonce.A) abundant ； B) complicated ； C) conflict ；D) confronted；E) distributed ；F) environment； G) highlighted； H) innovations；I) intensified ； J) outcome ；K) rate；L) reliable；M) replace ；N) sources ；O) subsequentWater is life. We depend on it to keep us and the（1） healthy. Nonetheless, many people take water as a natural resource for granted. Today, the situation has changed. As the population of the world increases, and with it the demand for water, there is growing concern that our water supplies will not be as （2） as we think. Eighty countries now have water shortages and 2 billion people lack access to clean water. One billion people lack enough water to simply meet their basic needs.While nearly 70 percent of the world is covered by water, only 2. 5 percent of it is fresh. This tiny amount of fresh water available on the planet has remained fairly constant over time and is （3）unevenly around the world. The growth of the world population, therefore, （4） competition for a clean supply of water every year. Worse still, humans are not efficient users. According to the United Nations, water use has grown at more than twice the （5） of population increase in the last century. The reality is that an increasing number of regions are （6） with water scarcity. By 2025, two-thirds of the world's population may face water shortages.An adequate and（7）water supply is essential to the future of every country. To increase and conserve supplies of fresh water, many countries have been working at technological（8），one of which is in the process of desalination. New filtration systems have been developed to （9） traditional heating methods. Thus the expected （10） can be achieved: lower costs.
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