Soot and ash can be removed by electrostatic precipitators(静电吸尘器). Unfortunately, they use large amounts of electricity, and the electrical energy, which is hardly affordable for most of us, has to come from somewhere. Fly ash removed from the air has to be put on the land or water, although it could be used in some way.

　　The elimination(去除) of sulfur dioxide is more difficult. Low-sulfur coal is rare and expensive. Although sulfur can be washed from finely pulverized(粉末化) coal, the process is expensive. There are also processes for changing dirty coal into clean liquid and gaseous fuels. These processes may hold promise for the future, but they are too expensive to compete economically with other fuels at present. They also waste a part of the coal’s energy.

　　1. What is the passage mainly talking about?

　　A. The type and form of pollution .

　　B. The cause and effect of pollution.

　　C. The situation and elimination of pollution.

　　D. The concept and examples of pollution.

　　2. What can we infer from the first paragraph?

　　A. Human beings should not have begun their conquest of nature.

　　B. Human activities contribute more to pollution than natural disasters do.

　　C. Seneca and the Queen of England were both over-sensitive to air pollution.

　　D. The industrial revolution was a disadvantage in terms of air pollution.

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