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The problems _______ the new government are enormous.
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Water 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.A.abundant B. complicated C. conflict D. confronted E. distributedF.environment G. highlight H. innovations I. intensified J. outcomeK. rateL. reliableM. replace N. sources O. subsequent
某房地产公司有50套公寓要出租,当租金定为每月1800元时,公寓会全部租出去.当租金每月增加100元时,就有一套公寓租不出去,而租出去的房子每月需花费200元的整修维护费.试问房租金定为多少可获得最大收入?
导数为零的点是.
导数不存在的点叫.
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