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On a rainy day, yon will see many streams of muddy (多泥的) water running down the slopes (斜坡) of a hill. The water is muddy because it washes away soil from the hill slopes.

  Sometimes soil is blown away by strong winds. When the soil is carried away by water or wind, we say that the land is eroded (侵蚀). This is known as soil erosion.

  Plants can not grow on eroded land.There is not enough soil on eroded land to give them the things they need.Plants need water and salts from the soil.

  We can do a number of things to stop soil erosion. This is called soil conservation(保护).

  One way of soil conservation on flat, open ground is to grow small plants such as grasses. Their roots hold the soil tightly together.

  Another way is to plant trees around an open field.Thus soil erosion by strong winds can not take place. Rows of trees act as a very big wall.

  Soil erosion on slopes can be stopped by cutting “steps” called terraces (梯田). Water carrying soil can not run straight down the slope now. It has to run down the terraces. This slows down the flow (流速) of the water. Most of the soil in the water is left behind on the terraces.

(1)On a rainy day the water running down the slopes of a hill is muddy because ________.

[  ]

A.there are no terraces on the slopes

B.there are no small plants on the slopes

C.it washes away soil on the slopes

D.there is too much soil on the slopes

(2)Plants cannot grow on eroded land because _______.

[  ]

A.there is a lot of sand in it

B.there is not enough water and salts in it

C.there is no water in it

D.the land is too hard

(3)The way of soil conservation on flat, open ground is ________.

[  ]

A.to grow small plants such as grasses

B.to plant trees around an open field

C.to add fertility to the soil

D.A or B

答案:C;B;D
解析:

(1) C 根据文章第一段最后一句话可知.

(2) B 第三段二、三句话说明人们不能在斜坡上种植,因为没有足够的水和盐分.

(3) D 第五段One way of …,第六段Another way…给出了土壤保护方式.


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