Saturday was a day of darkness. For twenty miles around London, no light came through the smog. The air was cold and still. And the coal fires continued to burn throughout the weekend. On Monday, 8 December, more than one hundred people died of heart attacks while trying desperately to breathe. By the time a breeze cleared the air on Tuesday, 9 December, more than 4,000 deaths had been caused by the smog.

　　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.

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