四级考试是许多童鞋必须通过的考试，其重要程度不言而喻。希望通过四级听力天天练，童鞋们可以提高听力水平，高分通过四级，冲刺六级。
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Japan
Denmark
Greece
America
Heterogeneity
听力原文：
Crime is increasing worldwide. ____1____ Crime rates have always been high in multi-cultural industrialized societies such as the United States. But a new phenomenon has appeared on the world scene: rapidly rising crime rates in nations that previously reported few offences. Street crimes such as robbery, rape, murder and auto theft are clearly rising, particularly in Eastern European countries, such as Hungary, and in Western European nations, such as the Untied Kingdom. What is driving this crime explosion? There are no simple answers. Still, there are certain conditions associated with rising crime. Increasing heterogeneity of population, greater cultural pluralism, higher immigration, democratization of governments, changing national borders, greater economic growth and the lack of accepted social ideas of right and wrong. These conditions are increasingly observable around the world. ____2____ Multiculturalism can be a rewarding, enriching experience, but it can also lead to a clash of values. ____3____
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There is every reason to believe the trend will continue through the next few decades.
For instance, cultures that were previously isolated and homogenous, such as Japan, Denmark and Greece, are now facing the sort of cultural variety that has been common in America for most of its history.
Heterogeneity in societies will be the rule in the 21st century, and failure to recognize and plan for such diversity can lead to serious crime problems.