Question

14．Why is it so difficult to fall asleep when you are overtired？There is no one answer that applies to every individual．But many people fail to note the difference between fatigue，physical tiredness and sleepiness，the inability to stay awake．It's possible to feel"tired"physically and still be unable to fall asleep，because while your body may be exhausted，you don't feel sleepy．To fall asleep，you need enough time to relax，even if you feel fatigued．It's not so easy to simply"turn off"．According to Carl E．Hunt，director of the National Center on Sleep Disorders Research in Bethesda，Maryland，most people do not allow themselves relaxed．
Lack of sleep complicates matters even more．Experts say adults need at least 7 to 8 hours of sleep a night to function properly．When you get less sleep than that on consecutive （连续） nights，you begin to be burdened by"sleep debt"．As sleep debt increases （and functionality decreases），your body experiences a stress response and begins to release adrenaline （肾上腺素）．Now a bad cycle has been created：You experience the feeling of being more and more tired，but your body is increasingly stimulated．"Power sleeping"for more hours on weekends is only a temporary solution．"There is no substitute for getting a good night's sleep on a regular basis，"says Hunt．
Most of us，however，don't get the sleep we need．According to the 2002 National Sleep Foundation，Americans sleep an average of 6.9 hours per night during the week，and 58 percent of adults experience sleeplessness a few nights a week or more．

33．The writer intends to tell usD．
A．Americans don't get enough sleep
B．what benefits we can get from enough sleep   
C．lack of sleep has a bad effect on our body  
D．why it's difficult for overtired people to fall asleep  
34．Which of the following is NOT caused by lack of sleep？C
A．Power sleeping．                        
B．Sleep debt．
C．Lack of adrenaline．                    
D．Function badly．
35．From the passage we can draw a conclusion that lack of sleepD．
A．is so common that it isn't worth paying attention to
B．doesn't matter for it can be solved by"Power sleeping
C．can make it easy to fall asleep when one is overtired
D．may make it difficult to fall asleep when one is overtired．

Answer 1

分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了为何你劳累过度却又如此难以入睡的原因，大多数人都没有给自己充分的舒缓时间，长期的睡眠不足紊乱了身体机能，容易导致疲惫时难以入睡，因此我们一定要养成每晚有规律的安睡的习惯．

解答 33．D．推理判断题．根据文章第一段"Why is it so difficult to fall asleep when you are overtired？There is no one answer that applies to every individual"，可知作者的主要目的是告诉我们为何极度疲惫的人难以入睡的原因；故选D．
34．C．细节理解题．根据文章第二段"you begin to be burdened by"sleep debt"．As sleep debt increases （and functionality decreases），your body experiences a stress response and begins to release adrenaline （肾上腺素）""Power sleeping"for more hours on weekends is only a temporary solution"，可知睡眠不足会导致睡眠债，肾上腺素增多，长睡不醒等，故选C．
35．D．推理判断题．根据最后一段"Americans sleep an average of 6.9 hours per night during the week，and 58 percent of adults experience sleeplessness a few nights a week or more"，可推测睡眠不足有可能导致失眠现象；故选D．

点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．