71. what does the University of Melbourne study mainly show?

　　A.People who surf the Internet are good employees.

　　B. Not everyone surfs the Internet for fun during office hours.

　　C.Surfing the Internet for fun during office hours increase productivity.

　　D.The Internet is becoming more and more important in people’s life.

　　72. According to paragraph 3,Brent Coker would most probably agree that ________.

　　A.the longer a person’s mind rests the better attention he will have.

　　B.surfing the Internet is the best way to increase productivity.

　　C.workers should have a long break during office hours

　　D.workers should let their minds rest now and then.

　　73. Which of the following is not mentioned in the passage as one of the most popular suring activities?

　　A.Watching videos.

　　B.reading online news.

　　C.Reading online novels.

　　D.Playing online games.

　　74. The underlined word “block” in paragraph 4 means “_______”.

　　A.prevent

　　B.cycle

　　C.burst

　　D.breathe

　　75. What can we infer from the last paragraph？

　　A.Spending too much time surfing the Internet reduces productivity.

　　B.Those who never surf the Internet have the lowest productivity.

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