The chip is similar to that planted in more than 1 million dogs，cats and other pets in recent years to track and identify them.The doctor decided to test the chip himself after the World Trade Center disaster.He thought the dead in the disaster could have been identified if their names and other important information had been chipped.

　　Officials of the company said they hope to sell the chips to patients with man­made arms or legs.The idea is that the chip will provide immediate and correct medical information when it is needed.

　　The information can contain name，telephone number and other information.Or it can send out a message that，when connected to a computer，can call up records.The scanner can read it through clothes from over a meter away.The new product also could be used to control prisoners.Workplaces of great importance may want to use the chips for employees，too.Some parents may consider planting chips in young children or elderly relatives who may be unable to say their names，addresses or telephone numbers.

　　Some medical and technology specialists said the product raises new questions about the relationship between humans and computer technology and could cause problems if it is used against someone’s wishes，or if your personal information is read by those who should not see it.

　　5．In the text，computer chips have already been used to

　　.

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