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设X，Y相互独立且都服从N(μ，σ2)，求E[min(X，Y)]．
How is urbanization negatively affecting our society Growing (1) is associated with urbanism. Urbanism (2) , urban violence, political instability, crime and (3) behavior. It also perpetuates poverty and (4) the traditional family structure. Other problems include failing (5) , safety, transportation, housing, education and electricity. (6) are much higher in urban areas. With divorce rates rising, (7) is becoming more of a problem than before. People are (8) by race, religious practices, (9) heritage, as well as economic and social status. This often creates much (10) and prejudice between social groups. This can cause physical or mental damage to individuals or (11) .The government assumes major (12) for development attempting to meet rapidly increasing demands for (13) , housing, transportation and employment. But they are not able to (14) all the problems in urban areas.America has hired approximately (15) more teachers in the last few years than have been hired in the past, but the increase in population keeps the (16) just as large. Due to the (17) in urban areas and the lack of (18) opportunity, the crime rate is still a huge problem. The problems in urban areas are far more (19) than can be handled in any (20) efforts. 16（）
When Americans think about hunger, we usually think in terms of mass starvation in far-away countries. But hunger too often lurks (1) . In 2006, 35. 1 million people, including (2) children, in the United States did not have access to enough food for an active healthy life. Some of these individuals relied on emergency food sources and (3) .Although most people think of hungry people and homeless people as the same, the problem of hunger reaches (4) . While the number of people being hungry or (5) may be surprising, it is the faces of those hungry individuals that would probably (6) .The face of hunger is (7) who has worked hard for their entire lives only to find their savings (8) ; or a single mother who has to choose whether the salary from (9) will go to buy food or pay rent; or a child who struggles to (10) because his family couldn’t afford dinner the night before. A December 2006 survey estimated that (11) those requesting emergency food assistance were either children or their parents.Children (12) to live in households where someone experiences hunger and food insecurity than adults. (13) compared to one in five children live in households where someone suffers from hunger (14) .Child poverty is more widespread in the United States than in (15) ; at the same time, the U. S. government spends less than any industrialized country to (16) .We have long known that the (17) of small children need adequate food (18) . But science is just beginning to understand the full extent of this relationship. As late as the 1980s, conventional wisdom held that only the (19) actually alter brain development. The latest empirical evidence, however, shows that even relatively mild under-nutrition (20) in children which can last a lifetime. 19（）
When Americans think about hunger, we usually think in terms of mass starvation in far-away countries. But hunger too often lurks (1) . In 2006, 35. 1 million people, including (2) children, in the United States did not have access to enough food for an active healthy life. Some of these individuals relied on emergency food sources and (3) .Although most people think of hungry people and homeless people as the same, the problem of hunger reaches (4) . While the number of people being hungry or (5) may be surprising, it is the faces of those hungry individuals that would probably (6) .The face of hunger is (7) who has worked hard for their entire lives only to find their savings (8) ; or a single mother who has to choose whether the salary from (9) will go to buy food or pay rent; or a child who struggles to (10) because his family couldn’t afford dinner the night before. A December 2006 survey estimated that (11) those requesting emergency food assistance were either children or their parents.Children (12) to live in households where someone experiences hunger and food insecurity than adults. (13) compared to one in five children live in households where someone suffers from hunger (14) .Child poverty is more widespread in the United States than in (15) ; at the same time, the U. S. government spends less than any industrialized country to (16) .We have long known that the (17) of small children need adequate food (18) . But science is just beginning to understand the full extent of this relationship. As late as the 1980s, conventional wisdom held that only the (19) actually alter brain development. The latest empirical evidence, however, shows that even relatively mild under-nutrition (20) in children which can last a lifetime. 18（）
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