单选题 .  You are a German living in Berlin. One day you're walking down in a street minding your own business, when suddenly a stranger approaches with a smile on his face. After stopping you, he holds a small electronic device close to his face and speaks slowly into it, saying, in English: "Can you tell me where I can buy some sauerkraut?" What should you do? (a) Run away; (b) Call the police; (c) Listen closely for the device to say, in German: "Konnen Sic mir bitte sagen, wo ich Sauerkraut kaufen kann?"
    The most appropriate response would be (c), because the person in front of you is only a tourist trying to enjoy himself. The device is said to be the world's first portable translator—a hand-held microcomputer that at the same time converts one spoken language into another. The four-pound, battery-operated product is called the Voice, and it is the creation of Advanced Products and Technologies, an American electronic company. When the Voice is introduced in the United States in late April—at a price of $1,500—it will be capable of converting spoken English into Italian, German, French and Spanish. The product comes with separate cartridges (盒式存储器) for each of the four languages, which can be changed when the user travels from one country to another. The item will be sold in Europe soon after the U.S. introduction, with cartridges that convert Italian, German, French and Spanish into English.
    The Voice uses a microchip (微型集成块) and artificial intelligence to translate languages. It is started by voice command and produces voice output through a built-in speaker. When the user makes a statement or asks a question, the Voice immediately repeats what has been said in another language.1.  The stranger holding the Voice seems to be ______.