快速阅读文章中有时可能会问到所面临的问题是什么?某事情的原因是什么?等等，这样的问题在文中可能是在不同的位置都有表述，所以考生遇到这样的问题时，不能只局限在某一段里面找答案，可以先做后面的题目，在后面的阅读中发现还有该题的答案时，将相关信息合并后再确定答案

　　Water woes may seem remote to people living in rich countries like the United States. But Americans could face serious water shortages, too especially in areas that rely on groundwater. Groundwater accumulates in aquifers, layers of sand and gravel that lie between soil and bedrock. Although the United States has large aquifers, farmers, ranchers, and cities are tapping many of them for water faster than nature can replenish it. In northwest Texas, for example, over pumping has shrunk groundwater supplies by 25 percent, according to Postal.

　　Americans may face even more urgent problems from pollution. Drinking water in the United States is generally safe and meets high standards. Nevertheless, one in five Americans every day unknowingly drinks tap water contaminated with bacteria and chemical wastes, according to the Environmental Protection Agency. In Milwaukee, 400,000 people fell ill in 1993 after drinking tap water tainted with cryptosporidium,a microbe that causes fever, diarrhea and vomiting.

　　The problems Americans face concerning water are ground water shrinkage and tap water pollution.

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