26.The purpose of the first paragraph is to ___.

　　A.illustrate why people are less able to focus

　　B.show how boring a lecture in a dark room is

　　C.tell people how fatigue affects concentration

　　D.describe a situation where people can get bored

　　27. It can be concluded from Para. 2 that ___.

　　A. doing nothing leads people to get bored easily

　　B. western people pay little attention to boredom

　　C. boredom only affects the assembly line worker

　　D. people are liable to get bored in a dull situation

　　28. Researchers hold that boredom results from ___ .

　　A. natural surroundings          B. various kinds of factors

　　C. sensitive personalities      D. subjective perceptions

　　29. Improvement of people' s ability to focus may ___.

　　A. affect their moods      B. distract their minds

　　C. reduce their boredom      D. increase their depress:ion

　　30. The passage mainly involves ___.

　　A. effects of boredom on people' s life and work

　　B. various ways to conquer the feeling of boredom

　　C. studies of possible reasons why people get bored

　　D. the importance of scientific research into boredom