[单项选择]Passage Two
Water pollution affects man’s health, recreational use of water, industrial of water and sense of beauty.
The spread of water-carried disease is of great concern. In highly developed countries in particular, emphasis has shifted from concern over bacterial disease to concern over water-carried viral(病毒性的) disease. Viral hepatitis(肝炎), for example, has been found to occur more frequently in cities whose water supplies have comparatively high levels of water impurity. Poisonous chemicals found in streams that are ultimately used for water supplies also create an important public health problem.
It is clear that poisonous chemicals must be excluded from water, but more and more chemicals from new pesticides, fertilizers, and other new products have been found in water. Since the public health significance of these chemicals is not yet fully known, they are of increasing concern. The chemicals from fertilizers are also finding their way int
A. water quality necessary for steel mills
B. soft water and hard water for industrial processes
C. cooling water of low sanitary quality
D. water standards for paper mills

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[单项选择]Passage Two
Water pollution affects man’s health, recreational use of water, industrial of water and sense of beauty.
The spread of water-carried disease is of great concern. In highly developed countries in particular, emphasis has shifted from concern over bacterial disease to concern over water-carried viral(病毒性的) disease. Viral hepatitis(肝炎), for example, has been found to occur more frequently in cities whose water supplies have comparatively high levels of water impurity. Poisonous chemicals found in streams that are ultimately used for water supplies also create an important public health problem.
It is clear that poisonous chemicals must be excluded from water, but more and more chemicals from new pesticides, fertilizers, and other new products have been found in water. Since the public health significance of these chemicals is not yet fully known, they are of increasing concern. The chemicals from fertilizers are also finding their way int
A. bacterial disease
B. water-carried disease
C. poisonous chemicals in streams
D. water impurity

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[单项选择]From the very beginning, water has furnished man with a source of food and a highway to travel. The first civilizations arose (76) water was the dominant element in the environment, a challenge (77) man’s ingenuity. The Egyptians invented the 365-day calendar (78) the Nile’s annual flooding. The Babylonians (79) were among the most famous law-makers in ancient times, invented laws (80) water usage. Water inspired the Chinese to build a 1,000 miles’ canal, a complex system (81) , after 2,500 years, remains particularly in use and still commands the astonishment of engineers. But the ancients never found complete solutions (82) their water problem. The Yellow River is also known as "China’s Sorrow". It is so unpredictable and dangerous (83) in a single flood it has caused a million deaths. Floods slowed the great (84) of the Indus River Valleys, and innumerable damages ruined much of its lan
A. who
B. in which
C. which
D. by which

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