Riversareoneofourmostimportantnaturalresources.Manyo...

問題詳情：

    Rivers are one of our most important natural resources. Many of the world’s great cities are located on rivers, and almost __1_______ country has at least one river __2_______(flow) through it that plays __3________ important part in the lives of its people.

    Since the beginning of history, people _4______________ (use) rivers for transportation. The longest 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 （消遣，*活動）for the people __6________________ live along their banks.

    However, large cities and industries that are located on rivers often make problems. As the cities grow __7____________ size and industries increase in number, the water in the rivers becomes __8_____________ (pollute) with chemicals and other materials. People come to kwon the __9_____________ (important) of doing more to keep their rivers clean __10_____________ they want to enjoy the benefits of this natural resource.    

【回答】

1. every / each         2. flowing    3 an       4 have used    5 Besides 

6 who   7 in         8 polluted      9 importance  10 if

知識點：語法填空

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