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发布时间：2006-06-23 22:36     点击：

　　warmer that makes use of a harmless chemical reaction in order to generate heat. This winter the

　　Poco body warmer is making its debut in Canada, the United States and parts of Europe. In

　　addition to chasing away winter chills, the body warmer can be used to help relieve pain that

　　results from muscle sprains and arthritis.

　　The Poco body warmer measures about three by five inches and is one quarter inch thick. It

　　consists of a cloth bag containing a mixture of iron powder, moisturized wood powder, activated carbon and salt. To get it going, the user simply opens the outer vinyl bag in which the unit is vacuum-packed and shakes the cloth bag. The unit then absorbs oxygen from the air, which in conjunction with the moisture from the wood powder oxidizes the iron, giving off heat. The packet maintains an average temperature of 140 degree Fahrenheit for 24 hours, according to the manufacturer. Aoi Co. officials say that the product contains no toxic chemicals. The only

　　precaution users need to follow is to avoid direct contact between the skin and the body warmer

　　because burns can occur. The unit sells for about $ 1.

　　11. What is the author's main purpose in the passage?

　　(A) To explain a chemical reaction.

　　(B) To recommend a cure for arthritis.

　　(C) To introduce a new product.

　　(D) To compare central heating with the body warmer.

　　12. Which of the following is LEAST likely to be characteristic of a Poco body warmer?

　　(A) It makes use of electric power to generate heat.

　　(B) It measures about three by five inches and is one quarter inch thick.

　　(C) It contains iron powder, wood powder, carbon and salt.

　　(D) It maintains an average temperature of 140 degrees Fahrenheit.

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