B．describing his own experiences

　　C．distinguishing sexual differences

　　D．discussing research experiments

　　Passage 　(2017·天津)

　　话题：远距离签名

　　词数：368

　　A world­famous Canadian author，Margaret Atwood，has created the world's first long­distance signing device(装置)，the LongPen.

　　After many tiring book­signing tours from city to city，Atwood thought there must be a better way to do them.She hired some technical experts and started her own company in 2004.Together they designed the LongPen.Here's how it works：The author writes a personal message and signature on a computer tablet(手写板) using a special pen.On the receiving end，in another city，a robotic arm fitted with a regular pen signs the book.The author and fan can talk with each other via webcams(网络摄像机) and computer screens.

　　Work on the LongPen began in Atwood's basement(地下室)．At first，they had no idea it would be as hard as it turned out to be.The device went through several versions，including one that actually had smoke coming out of it.The inventing finally completed，test runs were made in Ottawa，and the LongPen was officially launched at the 2006 London Book Fair.From here，Atwood conducted two transatlantic book signings of her latest book for fans in Toronto and New York City.

　　The LongPen produces a unique signature each time because it copies the movement of the author in real time.It has several other potential applications.It could increase credit card security and allow people to sign contracts from another province.The video exchange between signer and receiver can be recorded on DVD for proof when legal documents are used.

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