To be sure, robots that walk on two legs and talk like people are still a long way off. However, robots that do basic housework such as cleaning or gardening are sure to come out soon. One thing is certain—when these robots do come into our homes, it will change things forever.21. The underlined part “flying off the shelves” in the second paragraph means________.

　　A. Selling well.

　　B. Cleaning the shelves smartly.

　　C. Flying freely

　　D. Dropping onto the floor

　　22.Which plays a more important role in revolutionizing the robot?

　　A. Science and technology.

　　B. Rapid development of companies.

　　C. Effective marketing means.

　　D. Great demand from the buyers.

　　23. Which of the following statements is TRUE?

　　A. Robots have already come into every home.

　　B. Technology is the only basis of the development of robots.

　　C. General Electric is not interested in designing small robots.

　　D. Robots that can walk on two legs and talk like people are still far from us.

　　B

　　Few of us make money by losing sleep. But three graduate students at Brown University in Providence built a company around sleep deprivation(睡眠不足).

　　Jason Donahue, Ben Rubin and Eric Shashoua were working late nights in Brown’s business and engineering schools. They began thinking about ways to sleep better. They discovered they weren’t alone in burning the midnight oil. Around 20% of Americans get less than six hours of rest a night.

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