题目内容：

Alexa is a form of artificial intelligence, or AI for short. Many people start their mornings by asking Alexa for the weather forecast or the latest news. A device(设备) that houses Alexa can also play music from your favorite playlists, keep a shopping list, order takeout food, answer questions, send messages and even run “smart” home controls.

Training AI systems to respond to problems with human-like intelligence and learn from their mistakes can take months, or even years. Consider Alexa and similar software, such as Apple’s Siri. To do the tasks its human owners ask, these systems must make sense of and then respond to sentences such as, “Alexa, play my Ed Sheeran playlist” or “Siri, what is the capital of India?”

Computers can’ t understand language as it is spoken by people. So AI researchers must find a way to help humans communicate with computers. The technology used to get computers to “understand” human speech or text is known as natural language processing. By natural language, computer scientists refer to the way people naturally talk or write. To teach an AI system a task like comprehending(理解) a sentence or responding to a person ’s last move in a board game, scientists need to feed it lots of examples.

AlphaGo is an AI system designed by Google that has beaten a human champion, Lee Sedol, at the strategy(策略) board game Go. To train AlphaGo, Google had to show it 30 million Go moves that people had made while playing the game. Then AlphaGo used what it learned to analyze those plays as it played against different versions (版本) of itself. During this practice, the program came up with new moves---ones never seen in games between people.

1.What does the example of Alexa show?

A. AI may replace humans one day.    B. AI is playing a role in our modern life.

C. AI has been widely used around the world.    D. AI has totally changed people’s bad habits.

2.How do scientists train AI systems?

A. By testing them thousands of times.    B. By teaching them almost everything.

C. By giving them quite a lot of tasks to do.    D. By providing them with large amounts of data.

3.What can we learn about AlphaGo?

A. It has become very skillful and intelligent    B. It is the most convenient AI system.

C. It avoids making any mistakes    D. It just follows human orders