单项选择题

Suppose you are a Spanish and live in Madrid. One day when you’re walking along the street, thinking about your own business, all of a sudden a stranger walked towards you with a smile on his face. After stopping you, he takes out a small electronic device from his pocket, holds it close to his mouth and speaks slowly into it, saying in English: "Excuse me, where is the restaurant" Then what would you do after hearing that I believe there would be three different kinds of response—some would run away quickly; some would call the police for help; and others would listen carefully to the sound from the device which said in Spanish, "Por favor donde eatáel restaurante"
The most properly response may be the last one because the person standing in front of you is probably only a tourist trying to amuse himself. It is said that the device is the world’s first portable transistor—a hand-held microcomputer that can converts one spoken language into another simultaneously.
The four-pound product is called the Voice, which is battery-operated, and it was invented by Advanced Products and Technologies—a well-known American electronics company. When the Voice was first introduced in the United States in late April at a price of over $ 1,000, it could convert spoken English into four other languages involving Italian, French, German and Spanish. The product includes separate cartridges (盒式储存器) for each of the four languages, which can be changed in an interactive way whenever the users need. The item will be seen on European market soon after the U. S.
The Voice uses a microchip (微型集成块) and artificial intelligence to translate various languages. It is started by voice command and outputs voices through a built-in speaker. Then the user can make a statement or ask a question, the Voice repeats immediately what has been said in another specified language.

The purpose that the stranger spoke into the Voice is ().

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