2017届高考英语一轮复习课时作业22：Unit 3《The world online》（牛津译林版选修7湖南专用）_高考复习指南

　　C．It will have to be rebooted when used again.

　　D．It has to be shut down and unplugged.

　　17．Which of the following is NOT mentioned in the text that contributes to the different amount of energy a computer consumes?

　　A．Whether it is a laptop or a desktop computer.

　　B．What kind of work the computer is dealing with.

　　C．The choice of how you use your computer.

　　D．Whether the operating systems are new.

　　18．When does a computer consume the most energy?

　　A．When we let it remain idle.

　　B．When we use it to do complex calculations.

　　C．When we use it to type some documents and e－mail.

　　D．When we use it for surfing the Internet.

　　19．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 energy－efficient

　　20．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.

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