A Brown University sleep researcher has some advice for people who run high schools: Don’t start classes so early in the morning. It may not be that the students who nod off at their desks are lazy. And it may not be that their parents have failed to enforce (確保) bedtime. Instead, it may be that biologically these sleepyhead students aren’t used to the early hour.

“Maybe these kids me being asked to rise at the wrong time for their bodies,” says Mary Carskadon, a professor looking at problem of adolescent  (青春期的) sleep at Brown’s School of Medicine.

Carskadon is trying to understand more about the effects of early school time in adolescents. And, at a more basic level. she and her team are trying to learn more about how the biological changes of adolescence affect sleep needs and patterns.

Carskadon says her work suggests that adolescents may need more sleep than they did at childhood, no less, as commonly thought.

Sleep patters change during adolescence, as any parent of an adolescent can prove. Most adolescents prefer to stay up later at nigh and sleep later in the morning. But it’s not just a matter of choice their bodies are going through a change of sleep patters.

All of this makes the transfer from middle school to high school―which may start one hour earlier in the morning  ---- all the more difficult , Carskadon says. With their increased need for sleep and their biological clocks set on the “sleep late, rise late” pattern, adolescent are up against difficulties when it conics to trying to be up by 5 or 6 a.m. for a 7:30 a.m. first hell. A short sleep on a desktop may be their body’s way of saying. “I need a timeout.”

48. Carskadon suggests that high schools should not start classes so early in the morning because ________.

A. it is really tough for parents to enforce bedtime

B. it is biologically difficult for students to rise early

C. students work so late at night that they can’t get up early

D. students are so lazy that they don’t like to go to school early

49. The underlined phrase “nod off” most probably means “ _______”.

A. turn around    B. agree with others  C. full asleep

D. refuse to work

50. What might be a reason for the hard transfer middle school to high school?

A. Adolescents depend more on their parents.

B. Adolescents have to choose their sleep patterns.

C. Adolescents sleep better than they did at childhood.

D. Adolescents need more sleep than they used to.

51. What is the test mainly about?

A. Adolescent heath care.      B. Problems in adolescent learning.

C. Adolescent sleep difficulties.   D. Changes in adolescent sleep needs and patterns.

 

解析：

48. B。根據(jù)第一段最后一句話“Instead, it may be that biologically these sleepyhead students aren’t used to the early hour.” 推斷出。

49C。此題考查考生猜詞的能力。青少年太早來到學(xué)校上課，就坐在桌旁打盹。而且我們知道“nod”有點(diǎn)頭的意思。根據(jù)常識，打盹的時(shí)候會(huì)情不自禁地垂下頭。

50D。本題屬于推理判斷題,考查考生對語篇的整體理解程度.其實(shí)本題難度不大,,其它三個(gè)選擇項(xiàng)比較容易排除.

51. D�？疾閷ξ恼麓笠獾睦斫�。A項(xiàng)范圍太廣。B項(xiàng)青少年的學(xué)習(xí)問題。C青少年的睡眠困難，而文章講得是青少年睡眠時(shí)間不足，甚至課堂上都要打盹，與文章內(nèi)容不符。

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