B．When we use it to do complex calculations.

　　C．When we use it to type some documents and e­mails.

　　D．When we use it for surfing the Internet.

　　()4.The reason why a desktop computer uses more energy than a laptop computer is that______.

　　A．a desktop computer’s monitor is separate and often larger

　　B．a desktop computer is larger than a laptop computer in size

　　C．a desktop computer performs more kinds of work than a laptop computer

　　D．a desktop computer is not energy­efficient

　　()5.Which of the following is implied in the first two paragraphs?

　　A．Frequent starting and stopping can damage a computer.

　　B．A computer’s longevity depends more on the proper way you use it.

　　C．A virus picked up from the Internet is likely to damage a computer.

　　D．The more often you use a computer, the more smoothly it works.

　　(二)

　　When top engineers in Germany wanted to build a more energy­efficient car, they headed to the natural history museum to study dolphins and sharks.But it was the boxfish (盒子鱼)that interested them.

　　“We were surprised when this clumsy­looking fish became our model for designing an aerodynamic(空气动力学的)car，”says Thomas Weber.He is the research and development chief for the car company Daimler.An aerodynamic design reduces wind drag and increases fuel efficiency.

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