题目内容
12.To help make up for sleep lost during marathon night flights,migrating(迁徙) birds take hundreds of power nap(小睡) during the day,each lasting a few seconds.Every autumn,Swainson's thrushes(画眉) fly up to 3,000miles from their breeding grounds in northern Canada and Alaska to winter in Central and South America.Come spring,the birds make the long trip back.
The birds fly mostly at night and often for long hours at a time,leaving little time for sleep.So to get through these tiresome periods,thrushes,during autumn and spring when the birds are normally migrating,change their sleep patterns,staying awake at night and resting during day.But instead of sleeping for a long period at a time,the birds took several naps a day,each one lasting only 9seconds on average.
The thrushes also mixed up their shut-eye sessions with two other forms of sleep.In one,called unilateral eye closure,or UEC,the birds rested one eye and one half of their brains while their other eye and half brain remained open and active,protecting them from danger.
The birds also occasionally slipped into another state,one that any college student who has ever been stuck in a boring lecture can relate to.Called drownsiness(睡意),this state is characterized by a partial shutting of both eyes that still allows for some visual processing.
"In terms of quality,drowsiness may be less useful than normal sleep,but it may also be safer."said Fuchs.
What's interesting is that even animals should make up for sleep loss.That a need for sleep cannot be lost even in these birds means the importance of sleep for many,if not all,animals,not to mention human.
29.What would be the best title for the text?D
A.Migrating Birds Travel for Long Hours
B.Migrating Need Help
C.How Birds Migrate during Autumn
D.Migrating Birds Take Many Daily Power Naps
30.According to the text,when having drowsiness,the thrushesC.
A.will rest one eye and the other active
B.will often sleep during day
C.will still be careful with the possible dangers
D.will not see anything in front of them
31.What can we learn from the text?A
A.Sleep is important for human being.
B.Animals need sleep to rest.
C.Migrating birds need sleep only during day.
D.College students often have drowsiness in fall.
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了弥补睡眠期间夜间航班失去了马拉松,候鸟每天有许多日常的小睡.
解答 29.D.主旨大意题.根据第一段:To help make up for sleep lost during marathon night flights,migrating(迁徙) birds take hundreds of power nap(小睡) during the day可知文章主要讲为了弥补睡眠期间夜间航班失去了马拉松,候鸟每天有许多日常的小睡;故选D.
30.C.细节理解题.根据第四段:the birds rested one eye and one half of their brains while their other eye and half brain remained open and active,protecting them from danger可知有睡意时,画眉鸟还是会小心有危险;故选C.
31.A.推理判断题.根据最后一段:That a need for sleep cannot be lost even in these birds means the importance of sleep for many,if not all,animals,not to mention human可知睡眠对人类很重要;故选A.
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.
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