What does the passage mainly discuss?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 40.

Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centers, the problem of supplying water became important for inhabitants of a city, as well as for irrigation of the farms surrounding the city. Irrigation works were known in prehistoric times, and before 2000 BC the rulers of Babylonia and Egypt constructed systems of dams and canals to impound the flood waters of the Euphrates and Nile rivers, controlling floods and providing irrigation water throughout the dry season. Such irrigation canals also supplied water for domestic purposes. The first people to consider the sanitation of their water supply were the ancient Romans, who constructed a vast system of aqueducts to bring the clean waters of the Apennine Mountains into the city and built basins and filters along these mains to ensure the clarity of the water. The construction of such extensive water-supply systems declined when the Roman Empire disintegrated, and for several centuries local springs and wells formed the main source of domestic and industrial water.

The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems. In London, the first pumping waterworks was completed in 1562; it pumped river water to a reservoir about 37 m above the level of the River Thames and from the reservoir the water was distributed by gravity, through lead pipes, to buildings in the vicinity.

Increased per-capita demand has coincided with water shortages in many countries. Southeast England, for example, receives only 14 percent of Britain's rainfall, has30 percent of its population, and has experienced declining winter rainfall since the 1980s.

In recent years a great deal of interest has been shown in the conversion of seawater to fresh water to provide drinking water for very dry areas, such as the Middle East. Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose. Some of these processes have been used in large facilities in the United States. Although these processes are successful, the cost of treating seawater is much higher than that for treating fresh water.

From A. Briggs’ article on culture, Microsoft® Student 2008

Câu 303151: What does the passage mainly discuss?

A. the water pumping system

B. the fresh water shortage

C. the results of water shortages

D. the development of water supply

Xem lời giải

Câu hỏi : 303151

Quảng cáo

Phương pháp giải:

Đọc hiểu

Đáp án : D
(0) bình luận (0) lời giải
Giải chi tiết:
Đoạn văn chủ yếu thảo luận về điều gì?

A. hệ thống bơm nước

B. tình trạng thiếu nước ngọt

C. hậu quả của tình trạng thiếu nước

D. sự phát triển của hệ thống cấp nước

Thông tin: Early peoples had no need of engineering works to supply their water.

The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems.

Tạm dịch: Loài người thuở sơ khai không cần đến các công trình với mục đích cung cấp nước.

Việc phát minh ra máy bơm ở Anh vào giữa thế kỷ 16 đã mở rộng đáng kể tiềm năng phát triển các hệ thống cấp nước.

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