Day 7
语法填空：
Rivers are one of our most important natural resources.Many of the world’s great cities are located on rivers, and almost1._____ country has at least one river flowing through it 2.____plays an important part in the lives of its people.Since the beginning of history, people 3.______ (use) rivers for transportation. The 4. _____ (long) one in the United States is the Mississippi, and the lifeline of Egypt is the Nile. 5.____transportation, rivers give water to drink, water for crops, and chances for fun and recreation for the people 6.______ live along their banks. 7._______, large cities and industries 8.______ are located on rivers often make problems. 9._______ the cities grow in size and industries increase in number, the water in the rivers becomes polluted with chemicals and other materials. People are learning the 10._____ (important) of doing more to keep their rivers clean if they want to enjoy the benefits of this natural resource.
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