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Bài đọc How deserts are formed – IELTS Reading
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How deserts are formed
A A desert refers to a barren section of land, mainly in arid and semi-arid areas, where there is almost no precipitation, and the environment is hostile for any creature to inhabit. Deserts have been classified in a number of ways, generally combining total precipitation, how many days the rainfall occurs, temperature, humidity, and sometimes additional factors. In some places, deserts have clear boundaries marked by rivers, mountains or other landforms, while in other places, there are no clear-cut borders between desert and other landscape features.
B In arid areas where there is not any covering of vegetation protecting the land, sand and dust storms will frequently take place. This phenomenon often occurs along the desert margins instead of within the deserts, where there are already no finer materials left. When a steady wind starts to blow, fine particles on the open ground will begin vibrating. As the wind picks up, some of the particles are lifted into the air. When they fall onto the ground, they hit other particles which will then be jerked into the air in their turn, initiating a chain reaction.
C There has been a tremendous deal of publicity on how severe desertification can be, but the academic circle has never agreed on the causes of desertification. A common misunderstanding is that a shortage of precipitation causes the desertification—even the land in some barren areas will soon recover after the rain falls. In fact, more often than not, human activities are responsible for desertification. It might be true that the explosion in world population, especially in developing countries, is the primary cause of soil degradation and desertification. Since the population has become denser, the cultivation of crops has gone into progressively drier areas. It’s especially possible for these regions to go through periods of severe drought, which explains why crop failures are common. The raising of most crops requires the natural vegetation cover to be removed first; when crop failures occur, extensive tracts of land are devoid of a plant cover and thus susceptible to wind and water erosion. All through the 1990s, dryland areas went through a population growth of 18.5 per cent, mostly in severely impoverished developing countries.
D Livestock farming in semi-arid areas accelerates the erosion of soil and becomes one of the reasons for advancing desertification. In such areas where the vegetation is dominated by grasses, the breeding of livestock is a major economic activity. Grasses are necessary for anchoring barren topsoil in a dryland area. When a specific field is used to graze an excessive herd, it will experience a loss in vegetation coverage, and the soil will be trampled as well as be pulverized, leaving the topsoil exposed to destructive erosion elements such as winds and unexpected thunderstorms. For centuries, nomads have grazed their flocks and herds to any place where pasture can be found, and oases have offered chances for a more settled way of living. For some nomads, wherever they move to, the desert follows.
E Trees are of great importance when it comes to maintaining topsoil and slowing down the wind speed. In many Asian countries, firewood is the chief fuel used for cooking and heating, which has caused uncontrolled clear-cutting of forests in dryland ecosystems. When too many trees are cut down, windstorms and dust storms tend to occur.
F What’s worse, even political conflicts and wars can also contribute to desertification. To escape from the invading enemies, the refugees will move altogether into some of the most vulnerable ecosystems on the planet. They bring along their cultivation traditions, which might not be the right kind of practice for their new settlement.
G In the 20th century, one of the states of America had a large section of farmland that had turned into desert. Since then, actions have been enforced so that such a phenomenon of desertification will not happen again. To avoid the recurrence of desertification, people are encouraged to find other livelihoods which do not rely on traditional land uses, that are not as demanding on local land and natural resources, but can still generate viable income. Such livelihoods include but are not limited to dryland aquaculture for the raising of fish, crustaceans, and industrial compounds derived from microalgae, greenhouse agriculture, and activities that are related to tourism. Another way to prevent the recurrence of desertification is improving the economic prospects of life in city centers and places outside of drylands. Changing the general economic and institutional structures that generate new chances for people to support themselves would alleviate the current pressures accompanying the desertification processes.
H In society nowadays, new technologies are serving as a method to resolve the problems brought by desertification. Satellites have been utilized to investigate the influence that people and livestock have on our planet Earth. Nevertheless, this does not mean that alternative technologies are not needed to help with the problems and process of desertification.
Luyện tập How deserts are formed – IELTS Reading
Questions 14-20
Reading Passage 2 has eight paragraphs, A-H. Which paragraph contains the following information?
NB You may use any letter more than once.
Do the following statements agree with the information given in Reading Passage 2?
In boxes 21-26 on your answer sheet, write
TRUE if the statement agrees with the information
FALSE if the statement contradicts the information
NOT GIVEN If there is no information on this
Điểm số của bạn là % - đúng / câu
Đáp án How deserts are formed – IELTS Reading
| 14. B | 19. C | 24. TRUE |
| 15. G | 20. C | 25. NOT GIVEN |
| 16. A | 21. TRUE | 26. FALSE |
| 17. H | 22. FALSE | |
| 18. D | 23. FALSE |
Giải chi tiết How deserts are formed – IELTS Reading
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Questions 14-20: Dạng MATCHING HEADINGS Cách làm:
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14 A reference to the irregular movement of particles Đoạn B đề cập đến các hạt bụi/ hạt cát rung, bị gió nhấc lên, rơi xuống va vào hạt khác làm hạt khác bật lên → Chuyển động giật cục, không đều ⇒ Đáp án chính xác là B |
Đoạn B: fine particles on the open ground will begin vibrating. As the wind picks up, some of the particles are lifted into the air. When they fall onto the ground, they hit other particles which will then be jerked into the air in their turn, initiating a chain reaction. |
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15 Mention of a productive land turning into a desert in the 20th century Đoạn G nhắc đúng việc đất nông nghiệp (productive land/farmland) biến thành sa mạc trong thế kỷ 20. ⇒ Đáp án chính xác là G |
Đoạn G: In the 20th century… a large section of farmland had turned into desert. |
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16 Types of deserts Đoạn A đề cập đến việc sa mạc được phân loại theo nhiều cách (dựa vào lượng mưa, số ngày mưa, nhiệt độ, độ ẩm, …). ⇒ Đáp án chính xác là A |
Đoạn A: Deserts have been classified in a number of ways, generally combining total precipitation, how many days the rainfall occurs, temperature, humidity, and sometimes additional factors. |
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17 Mention of technical methods used to tackle the problems of deserts Đoạn H nhắc đến công nghệ/kỹ thuật để xử lý/nghiên cứu vấn đề sa mạc hoá ⇒ Đáp án chính xác là H |
Đoạn H: Satellites have been utilized to investigate the influence that people and livestock have on our planet Earth. Nevertheless, this does not mean that alternative technologies are not needed to help with the problems and process of desertification. |
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18 The influence of a traditional way of feeding animals on desertification Đoạn D nói về cách chăn thả truyền thống (nomads graze flocks/herds) làm mất cỏ, lộ đất mặt, tăng xói mòn → đẩy nhanh sa mạc hoá. ⇒ Đáp án chính xác là D |
Đoạn D: For centuries, nomads have grazed their flocks and herds to any place where pasture can be found, and oases have offered chances for a more settled way of living. For some nomads, wherever they move to, the desert follows. |
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19 A lack of agreement among scientists about the causes of desertification Đoạn C nói rõ giới học thuật chưa thống nhất nguyên nhân sa mạc hoá ⇒ Đáp án chính xác là C |
Đoạn C: There has been a tremendous deal of publicity on how severe desertification can be, but the academic circle has never agreed on the causes of desertification |
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20 A description of the adverse effects of growing food crops Đoạn C mô tả tác hại của việc trồng trọt: phải loại bỏ thảm thực vật, khi mất mùa thì đất trơ trọi, dễ bị gió và nước xói mòn → thúc đẩy sa mạc hoá. ⇒ Đáp án chính xác là C |
Đoạn C: the cultivation of crops has gone into progressively drier areas…The raising of most crops requires the natural vegetation cover to be removed…when crop failures occur… land [is] devoid of a plant cover and thus susceptible to wind and water erosion. |
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Questions 21-26: Dạng TRUE/FALSE/NOT GIVEN & YES/NO/NOT GIVEN Cách làm:
Chọn đáp án bằng cách lần lượt trả lời 2 câu hỏi:
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21 It is difficult to ascertain where the deserts end in some areas.
⇒ Đáp án chính xác là TRUE |
[…] in other places, there are no clear-cut borders between desert and other landscape features […] |
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22 The media is uninterested in the problems of desertification.
⇒ Đáp án chính xác là FALSE |
[…] There has been a tremendous deal of publicity on how severe desertification can be […] |
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23 The most common cause of desertification is the lack of rainfall.
⇒ Đáp án chính xác là FALSE |
[…] A common misunderstanding is that a shortage of precipitation causes the desertificationIn fact… human activities are responsible for desertification […] |
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24 Farming animals in semi-arid areas will increase soil erosion.
⇒ Đáp án chính xác là TRUE |
[…] Livestock farming in semi-arid areas accelerates the erosion of soil and becomes one of the reasons for advancing desertification. In such areas where the vegetation is dominated by grasses, the breeding of livestock is a major economic activity […] |
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25 People in Asian countries no longer use firewood as the chief fuel.
⇒ Đáp án chính xác là NOT GIVEN |
[…] In many Asian countries, firewood is the chief fuel used for cooking and heating […] |
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26 Technology studying the relationship of people, livestock and desertification has not yet been invented.
⇒ Đáp án chính xác là TRUE |
[…] Satellites have been utilized to investigate the influence that people and livestock have […] |
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