题目内容
2.If you want your land to keep fertile,you must try to stop soil from being carried away by water or wind.When soil is taken away by flowing water or blowing winds,we call it soil erosion.Ways have been found to stop soil erosion,and this is known as soil conservation.One way of stopping soil erosion is to grow small plants such as grass.These plants are referred to as cover crops,whose roots hold the soil tightly together.The rain water cannot wash away the soil.When trees and tall bushes are planted at the edges of an open field,soil erosion by strong winds cannot take place.The trees and bushes,which act as a very big and firm wall,protect the open land from the winds.The way to stop soil erosion on slopes is to build terraces(梯田)on the slope of hillside and mountainside.When the slope of a hillside is cut into"step",water carrying soil can not run straight down the terraces,which are used to slow down the speed of the flowing water containing much soil in it.In this way most of the soil in the water is left behind on the terraces,with much soil in it.21.What takes place in soil erosion?B
A.Flood happens to the fertile land.
B.A large quantity of the soil loses away gradually.
C.Terraces are built on the slope of hillside or mountainside.
D.Plants are grown to protect the open land.
22.According to the passage,trees and tall bushes are planted around an open fieldC.
A.because their roots hold soil tightly
B.because soil erosion causes terrible damages to crops
C.to stop soil from being blown away by winds
D.to keep the balance of nature
23.Which of the following is the best title of the passage?D
A.What Causes Soil Erosion B.The Importance of Erosion
C.Rain Erosion and Wind Erosion D.Erosion and the Way of Fight against Erosion.
分析 本文是一篇科教类阅读,属于说明文,果你想让你的土地保持肥沃,你必须尽量阻止土壤被水或风吹走.当土壤被流动的水或风吹走时,我们称之为土壤侵蚀.已经发现阻止土壤侵蚀,这就是所谓的土壤保护.本文以此展开,主要讲述了土壤侵蚀与抵御土壤侵蚀的方法.
解答 21.B.细节理解题.根据When soil is taken away by flowing water or blowing winds,we call it soil erosion.可知,当土壤被流动的水或风吹走时,我们称之为土壤侵蚀.故选B.
22.C.细节理解题.根据When trees and tall bushes are planted at the edges of an open field,soil erosion by strong winds cannot take place.The trees and bushes,which act as a very big and firm wall,protect the open land from the winds.可知,树木和高大的灌木丛被种在一个开放的田野周围可以阻止土壤侵蚀.故选C.
23.D.主旨大意题.阅读全文,根据文章内容可知,本文主要讲述了土壤侵蚀与抵御土壤侵蚀的方法.故选D.
点评 本文是一篇科教类阅读,题目涉及多道细节理解题,主旨大意题.做题时学生应仔细阅读原文,把握文章主要内容,联系文章上下文内容并结合所给选项含义,从中选出正确答案,一定要做到有理有据,切忌胡乱猜测.
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