Rivers are one of our most important resources． Many of the world’s great cities are __1_ on rivers, and almost every country has __2__ one river flowing __3__it that plays an important part in the lives of _4__people．

    Since the beginning of history, people have used rivers __5__transportation．Some great _6___ are the Mississippi, the Nile, the Gongo etc．The _7_ of all for navigations(水路航行), however, is the Amazon in Brazil．It is so wide and so deep__8__ large ships and ocean liners can go about two thousand miles __9__it． Besides __10__, rivers __11__food, water to drink, water for crops, and opportunities(机会) __12_ fun．However, large cities and industries that are located upon rivers often make __13__, __14_the cities grow in __15__and the industries _16__ in number, the water in the rivers becomes ___17__with chemicals and other materials．People are __18__ the importance, however, of doing more to keep their rivers __19__if they want to __20__the benefits of this natural resource(供应的来源)

1．A．stood               B．located              C．lived                 D．arisen

2．A．at best              B．at last               C．at most              D．at least

3．A．through             B．cross               C．over                 D．under

4．A．their                B．it’s                 C．its                   D．theirs

5．A．with                 B．off                 C．of                   D．for

6．A．streams             B．seas                C．ocean                D．rivers

7．A．shortest             B．fastest              C．longest                D．smallest

8．A．and                B．that                 C．for                  D．where

9．A．upon               B．above               C．under                 D．below

10．A．voyage(航海)     B．making fun           C．touring                D．transportation

11．A．produce           B．explore(探索)        C．provide               D．plant

12．A．by              B．in                  C．for                  D．over

13．A．problems          B．questions            C．matters               D．affairs

14．A．If               B．As                 C．Until                  D．Unless

15．A．large              B．style                C．range                D．size

16．A．raise               B．produce            C．increase              D．expect

17．A．polluted            B．polluting            C．pollution              D．poison

18．A．seeking            B．learning             C．predicting            D．describing

19．A．dirty              B．clean               C．polluted               D．flowing

20．A．enjoy              B．refuse             C．like                  D．hate

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

　 Since the beginning of history, people have used rivers for transportation. The longest one in the United States is the Mississippi. The lifeline of Egypt is the 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 southeastern Asia. The greatest of all for navigation（航海）, however, is the Amazon in Brazil（巴西）. It is so wide and so deep that large ships can go about two thousand miles up it.

　　 Besides transportation, rivers give food to eat, water to drink, water for crops, and chances for fun. In order to increase the supply(供给) 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 on rivers often cause problems. As 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 importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits of these natural resources.

1．The greatest river for navigation is ________________.

　 A. the Mississippi　　　　　　　　　　　　　 B. the Nile　

C. the Mekong D. the Amazon

2．Which is NOT true according to the passage?

A. Many cities are located on rivers.

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

C. The Nile is in India.

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

3．When rivers are dammed, people use the water for __________.

A. keeping the rivers clean

B. making electricity

C. washing clothes

D. irrigation and the production of electricity

4．Most water in rivers is polluted with ___________.

A. people’s drinking water too much

B. people’s swimming in the river too much

C. chemicals and other materials

D. people’s building a dam across a river

5．The best title for the passage is _____________.

A. The Importance of Rivers　　　 　　　　　 B. Rivers in Cities

C. Transportation D. Natural Resources

Rivers are one of our most important natural resources(资源). Many of the world’s great cities are located on rivers, and almost every country has at least one river running through it that plays an important part in the lives of its people.
Since the beginning of history, people have used rivers for transportation. The longest one in the United States is the Mississippi. The lifeline of Egypt is the 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 southeastern Asia. The greatest of all for navigation（航海）, however, is the Amazon in Brazil（巴西）. It is so wide and so deep that large ships can go about two thousand miles up it.
Besides transportation, rivers give food to eat, water to drink, water for crops, and chances for fun. In order to increase the supply(供给) 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 on rivers often cause problems. As 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 importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits of these natural resources.
【小题1】The greatest river for navigation is ________________.

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

Since the beginning of history, people have used rivers for transportation. The longest one in the United States is the Mississippi. The lifeline of Egypt is the 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 southeastern Asia. The greatest of all for navigation（航海）, however, is the Amazon in Brazil（巴西）. It is so wide and so deep that large ships can go about two thousand miles up it.

Besides transportation, rivers give food to eat, water to drink, water for crops, and chances for fun. In order to increase the supply(供给) 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 on rivers often cause problems. As 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 importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits of these natural resources.

1.The greatest river for navigation is ________________.

2.Which is NOT true according to the passage?

3.When rivers are dammed, people use the water for __________.

4.Most water in rivers is polluted with ___________.

5.The best title for the passage is _____________.