阅读理解: If you want to keep your land fertile , you must try to stop soil from being washed away by water or winds. When soil is taken away by running water or blowing winds, we call it soil erosion. W 题目和参考答案——青夏教育精英家教网—

阅读理解：

　　If you want to keep your land fertile (肥沃), you must try to stop soil from being washed away by water or winds. When soil is taken away by running water or blowing winds, we call it soil erosion. Ways have been found to stop soil erosion and this is known as soil conservation (保持).

　　One way of stopping soil erosion is to grow small plants such as grasses. These plants are called cover crops, whose roots (根) hold the soil tightly together. It's difficult for rain water to wash away the soil. When trees and bushes (矮树丛) are planted at the edges of an open field, soil erosion by strong winds cannot take place easily. The trees and bushes, which act as a very big and strong wall, protect the open land from the winds. The way to stop soil erosion on slopes (斜坡) is to build terraces (梯田) on the slope of hillside.

　　When the slope of a hillside is cut into “stairs”, water carrying soil cannot run straight down the terraces, which are used to slow down the speed of the falling water containing much soil in it. In this way most of the soil in the water is left behind on the terraces.

1．What takes place in soil erosion?

[　　]

A．Flood happens to the fertile land.

B．A large quantity of earth is carried away by water or winds.

C．Terraces are built on the slope of hillside.

D．Plants are grown to protect the open land.

2．The underlined words in this passage means “________”.

[　　]

A．grass roots

B．trees and bushes

C．small and low plants, such as grasses, to protect soil from being eroded away

D．covering plants that produce grain or vegetables

3．Trees and bushes are planted around an open field

[　　]

A．because their roots hold soil tightly

B．to prevent soil from being blown away by winds

C．to stop soil from being washed away

D．to keep soil wet

4．Which of the following can be used as the best title for the passage?

[　　]

A．What Causes Soil Erosion?

B．The Importance of Conservation

C．Rain Erosion and Wind Erosion

D．Erosions and Ways to Fight It

5．Grasses, bushes, trees and terraces ________.

[　　]

A．can stop soil erosion

B．can stop soil from being washed away only

C．is called soil conservation

D．can stop soil from being blown away only

答案：B;C;B;D;A
解析：

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