【题目】 Rivers are one of our most important natural resources (自然资源). Many of the world’s great cities are located on rivers, and almost every country has at least one river flowing through it that plays an important part in the lives of its people.

Since the beginning of history, people have used rivers for transportation (交通). The longest one in the United States is the Mississippi. The lifeline of Egypt is Nile. To the people of India, the Ganges is great, but it is also important for transportation; ships can travel along it for a thousand miles. Other great rivers are the Congo in Africa and the Mekong in southeast Asia. The greatest of all for navigation (航海), however, is the Amazon in Brazil. It is so wide and so deep that large ships can go about two thousand miles upon it.   

Besides transportation, rivers give food, water to drink, water for crops, and chances for fun and recreation for the people who live along their bands. In order to increase the supply of water for crops, engineers sometimes build a dam (大坝) across a river and let a lake form behind the dam. Then people can use the water not only to irrigate (灌溉) their fields but also to make electricity for their homes and industries. However, large cities and industries that are located upon rivers often cause problems. As the cities grow in size and industries increase in number, the water in the rivers become polluted with chemicals and other materials. People are learning the importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits (利益) of this natural resource.

1The greatest river for navigation is ________ .

A.the NileB.the MississippiC.the AmazonD.the Mekong

2Large ships can go about ________ upon the Amazon.

A.200 metresB.2000 milesC.2000 metresD.20000 miles

3Rivers give ________ for people.

A.transportationB.food, water to drink, water for crops

C.chances for fun and recreationD.all of the above

4Which is wrong according to the passage?

A.The Nile is in India.

B.Many cities are located on rivers.

C.Almost every country has at least one important river.

D.Rivers play an important part in the lives of people.

5From a dam, people can use water for ________ .

A.keeping the rivers cleanB.only making electricity

C.washing clothesD.irrigating and making electricity

6The best title of the passage is .

A.Rivers in CitiesB.The importance of Rivers

C.TransportationD.Natural Resources

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