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Did the wind ever blow your hat away? Did you ever drop your notebook on a windy day?How many important pages did you lose? Wind is moving air. It can pick up light materials and carry them far away.
Wind is a force of erosion(侵蚀). It can carry away small materials such as dust particles(灰尘微粒) and sand particles from the earth's surface. However, wind itself does not cause much erosion. Most“wind”erosion is done by particles which are carried by wind. Wind is an important natural force of erosion in dry places.
Wind can easily pick up sand particles. When they are blown against rocks, the sand particles hit the rocks in the wind. This happens over and over again. Little by little, the rocks wear down.
The particles which are carried by wind not only cause erosion, they also build up. What is carried away by the wind in one place will drop somewhere else.
When wind slows down, it drops the materials that it is carrying. When sand is dropped, it builds up and becomes dunes(沙丘). Sand dunes are common in deserts and on beaches.Some dunes can be harmful. They can bury(埋)farms and homes,even whole towns.
Wind carries dust particles higher and farther than it carries sand. Thick deposits of wind-blown dust may also build up. The wind-blown dust is called loess(黄土).Loess deposits are found in Washington State and Oregon State.
Sometimes people plant grasses and trees to try to stop wind erosion. How does this help? The roots of plants help to hold down soil and other particles found on the ground.
1.The purpose of writing the first paragraph is to
A.introduce the topic B.make a comparison
C.give background information D.warn people of the situation 2.What does the underlined“it”in Paragraph 5 refer to?
A.Sand B.Wind
C.Erosion D.Dust
3.Which of the following is true according to the passage?
A.Wind itself can cause a lot of erosion to rocks.
B.Sand particles and dust particles cannot build up.
C.Planting grasses and trees can help stop wind erosion.
D.Wind can carry sand particles farther than dust particles.
4.This passage can probably be read in the .part of a magazine.
A.Travel B.Culture
C.Geography D.Business
1.A【解析】推理判断题。由第一段Did the wind ever blow your hat away? Did you ever drop your notebook on a windy day How many important pages did you lose? Wind is moving air.It can pick up light materials and carry them far away.可知通过陈述风产生后果，来引出风的危害的这个主题，故选A。
2.B【解析】词义猜测题。根据第五段“When wind slows down, it drops the materials that it is carrying.”当风变慢时，风所携带的物质就会掉落下来，可知it指代风，故选B。
3.C 【解析】推理判断题。根据第二段However, wind itself does not cause much erosion.可知风本身不会造成太多的侵蚀，所以A表述错误；根据第四段The particles which are carried by wind not only cause erosion,they also build up.可知风 携带的微粒不仅会造成侵蚀，还会堆积起来，所以B表述错误；根据第最后一段 The roots of plants help to hold down soil and other particles found on the ground.可 知植物的根有助于抑制土壤和地面上的其他颗粒物，种草种树有助于阻止风蚀， 所以表述C 正确；根据第六段Wind carries dust particles higher and farther than it carries sand.可知风携带的尘埃颗粒比它携带的沙子更高更远，所以D表述错误；故选C。
4.C 【解析】推理判断题。本篇介绍风蚀的形成、危害及防治；可能是地理杂志中的内容，故选C。
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