Question

Rivers are one of our most important natural resources (資源). Many of the world's great cities are located(坐落) on rivers, and almost every country has at least one river running through it that plays an important role in the lives of its people.
Since the beginning of the history, people have used rivers for transportation(運輸). The longest one in the United States is the Mississippi. The lifeline of Egypt is the Nile. To the people of India, the Gangs 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(莊稼), and chances for fun and entertainment for the people who live along their banks. In order to increase(增加) the supply of crops, engineers sometimes build a dam (大壩) across a river and let a lake from 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 make problems. As the cities grow in size and industries increase in number, the water in the rivers becomes polluted with chemicals(化學物質) 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.
小題1:The greatest river for navigation is ___________.

A．the Amazon	B．the Nile
C．the Mekong	D．the Mississippi

小題2:From a dam, people can use the water for ___________.

A．keeping the rivers clean	B．only making electricity
C．washing clothes	D．irrigation and making electricity

小題3:The water in the river is polluted because of _____________.

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

小題4:The best title of the passage is ___________.

A．Rivers in Cities	B．The importance of Rivers
C．Transportation	D．Natural Resources

Answer 1

小題1:A
小題2:D
小題3:C
小題4:B

試題分析：短文大意：本文主要講述了河流對于人類生活的重要性，以及河流收到污染的事實。
小題1:細節理解題。根據短文第二段The greatest of all for navigation (航海), however, is the Amazon in Brazil.描述，可知世界上最好的用來航行的河流是亞馬遜河。故選A。
小題2:細節理解題。根據短文倒數第二段In order to increase(增加) the supply of crops, engineers sometimes build a dam (大壩) across a river and let a lake from 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.描述，可知在河流中建好大壩后，人們不僅可以用喝水來灌溉，還可以利用河水來發電。故選D。
小題3:細節理解題。根據s the cities grow in size and industries increase in number, the water in the rivers becomes polluted with chemicals(化學物質) and other materials. 描述，可知喝水由于化學物質和其它東西收到了污染。故選C。
小題4:標題歸納題。閱讀短文可知本文主要講述了河流對于人類生活的重要性，以及河流收到污染的事實。故選B，河流的重要性。