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Each year thousands of people worldwide are killed or seriously injured by fires started in mattresses. 46 . To help prevent fires in crowded public spaces,E. I. Du Pont de Nemours &Co. recently invented a fire?resistant fabric（防火织物）。 The company claims that this fabric significantly reduces the combustibility（易燃性） of mattresses and upholstered（装有套子或垫子的）furniture. In tests conducted by a Boston-based hotel chain,the material has proved very efficient in preventing or delaying the combustion of mattresses and furniture after fires have been started. 47 . California and several other states are considering new regulations that would require the use of fire-resistant furniture in public places （defined as area where 10 or more people gather）。 48 . American laws require hotels to buy fire-resistant mattress covers,though covers made of fiber glass（纤维玻璃） and cotton do exist and are used by some companies. 49 .

The Du Pont fabric will sell for less than $5 a yard and it is believed that the market will develop over the next two years. 50 .

A The development of the material is timely

B And last year,England passed a law requiring that all furniture contain fine?resistant material

C The company expects that the competition will be very strong in the market because right now,its product is just one option

D And there are some expects

E Often the fires occur in hotels,and are caused by people smoking in bed

F However,the cotton covers wash out over time and the fiber glass is not very comfortable

答案：46 E 47 A 48 B 49 F 50 C