B) 用于标题对应题型中，例：

　　List of headings

　　I. Rivers and seas cause damage

　　II. Water, the provider of food

　　III. The scarcity of water

　　IV. What is water

　　V. How to solve flooding

　　VI. Humans relationship with water

　　And the future If we are to believe the forecasts, it is predicted that two thirds of the world population will be without fresh water by 2025. But for a growing number of regions of the world the future if already with us. While some areas are devastated by flooding, scarcity of water in many other places is causing conflict. The state of Texas in the United States of America is suffering a shortage of water with the Rio Grande falling to reach the Gulf of Mexico for the first time in 50 years in the spring of 2000, pitting region against region as they vie for water sources. With many parts of the globe running dry through drought and increased water consumption, there is now talk of water being the new oil.

　　分析：此段开头先提出了根据预测到2025年世界上将有三分之二的人口喝不到淡水接着分别用转折词but，while进一步提出某些地区由于洪水泛滥带来的破坏，在其它许多地方水的缺失已变得日趋严峻。接着从The state of Texaswater sources通过一个细节举例 来作进一步说明。

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