...;2,...;3,...;4,...B. RIVERS ARE ONE OF THE WORLD'S MOST IMPORTANT...

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B. Rivers are one of the world's most important natural 1. _____. Many cities are on large rivers,

and almost every country 2. _____ at least one river that plays an important part 3. ____ the lives of

its people. Besides transportation, rivers supply food, water for crops, water to drink, 4. _____

opportunities for recreation.