This is opposed to the “early bird” schedule, and is a kind of disorder where the individual tends to stay up much past midnight. Such a person has great difficulty in waking up in the mornings. Research suggests that night owls feel most alert and function best in the evenings and at night. Research findings have shown that about 20 per cent of people can be classified as “night owls” and only 10 per cent can be classified as “early birds”—the other 70 per cent are in the middle. Although this is clearly not true for all students, for the ones who are true night owls this gives them an excellent excuse for missing their lectures which unfortunately fall before midday.

　　43. What does the author stress in Paragraph 1?

　　A. Many students are absent from class.

　　B. Students are very tired on Monday mornings.

　　C. Students do not adjust their sleep patterns well.

　　D. Students are not well prepared for class on Mondays.

　　44. Which of the following is TRUE according to Paragraph 2?

　　A. Most students prefer to get up late in the morning.

　　B. Students don't sleep well because of alerting systems.

　　C. One's body clock governs the sleep/wake cycle independently.

　　D. Adolescents' delayed sleep/wake cycle isn't the preferred pattern.

　　45. Which of the following is closest in meaning to the underlined word “classified”？

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