英語(yǔ)翻譯
On a rainy day,you will see many streams of muddy 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(侵蝕).This is known as soil erosion.Plants cannot grow on eroded land.There is not enough soil on eroded land to give them the things they need.Planted need water and salt from the soil.We can do a number of things to stop soil erosion.This is called soil conservation.One way of soil conservation on flat,open ground is to grow small plants such as grasses.There roots hold the soil tightly together.Another way is to plant trees around an open field.Thus soil erosion by strong winds cannot 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 cannot go straight down the slope now.It has to run down the terraces.This slows down the flow of the water.Most of the soil in the water is left behind on the terraces.There are other ways for soil conservation.
1.The soil can be destroyed by
A.strong wind B.heavy rain C.snow D.bothAandB
2.When plants grow,they need
A.sand and soil B.water and soil C.water and salts D.rain
3.The method of soil conservation is
A.to grow grasses B.to plant trees C.to cut "steps" called terraces D.A.BandC
4.The main idea of this article is
A.how to protect the soil B.how to grow grass
C.why are the trees plants D.how to make terraces