Howwouldyouliketosleepwithonehalfyourbrainasleepandt...
問題詳情:
How would you like to sleep with one half your brain asleep and the other half awake? Dolphins sleep this way. Recently , scientists at Indiana State University have discovered that ducks sleep this way too. They found that ducks sleep half awake so they can rest and watch for danger at the same time.
After putting their ducks in a row and videotaping them, some researchers found ducks on the end of each row spent more time asleep with one eye open ,looking for predators.
“The more the ducks felt threatened ,the more they slept with one eye open,” said lead author Niels C. Rattenborg ,a graduate student at Indiana State University , “the unique is not that they do it ,but that they control it . When they sleep at the edge of a group ,they tend to realize greater danger ,so they spend more time sleeping with one half of their brain.” Ducks with one eye open were still awake enough to watch out for predators ,said the authors of the study ,which appears today in the journal Nature.
The researchers studied four groups of four ducks in boxes ,which were arranged in a row s on the end were found to sleep with one eye open 31.8 per cent of the time, compared to 12.4 percent of the time for ducks in the central position.
Also ,ducks in the central position did not open one eye more than the others, while ducks on each end kept the eye facing away from the group open 86.2 per cent of the time. Brain wave readings of the ducks showed that the half of the brain receiving signals from the closed eye indicated that half of the brain was sleeping. Signals from the half of the brain receiving signals from the open eye showed they are between fully awake and asleep.
32.It was discovered that .
A.dolphins sleep on their way
B.ducks can sleep half awake
C. most people would like to be half asleep
D.ducks have different sleeping habits from each other
33.Which of the following is true according to the passage?
A.Ducks with one eye open at the edge can still enjoy a certain degree of sleep.
B.Ducks with less sense of duty usually choose to stay in the center of a row.
C.A video tape recorder was the only electronic device used in the experiment.
D.Ducks on the northern end of a row would keep their eye facing the south open.
34.A predator is most likely to be .
A.an animal that hunts ,kills and eats other animals
B.a human being who looks after and feeds ducks
C.a scientist who does research work on animals
D.an animal that is likely to be friends with ducks
35.How many ducks were used in the experiment?
A.Four. B.Eight. C.Twelve. D.Sixteen.
【回答】
BAAD
知識點:健康保健類閱讀
題型:閱讀理解
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如圖中,A、B、C、D、E是單質,G、H、I、F是B、C、D、E分別和A形成的二元化合物,已知:①反應C+G ...
問題詳情:如圖中,A、B、C、D、E是單質,G、H、I、F是B、C、D、E分別和A形成的二元化合物,已知:①反應C+G B+H能放出大量的熱,G是紅綜*固體粉末;②I是一種常見的溫室氣體,它和E可以發生反應:2E+I2F+D,F中的E元素的質量分數為60%.回答問題: ⑴①中反應的化學方程式為 ...
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用若干個體積為1的正方體搭成一個幾何體,其正檢視、側檢視都是如圖所示的圖形,則這個幾何體的最大體積與最小體積的...
問題詳情:用若干個體積為1的正方體搭成一個幾何體,其正檢視、側檢視都是如圖所示的圖形,則這個幾何體的最大體積與最小體積的差是()A.2B.3C.4D.5【回答】解析:由正檢視、側檢視可知,此幾何體的體積最小時,底層有5個小正方體,上面有2個小正方體,共7個小正方體;體積最大時,底...
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—Thestateofillnessiscomplicated.Weneedanexperienceddoct...
問題詳情:—Thestateofillnessiscomplicated.Weneedanexperienceddoctor.—Whomwouldyouliketohave____? A.sentfor B.sendfor C.tosendfor D.beens...
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“吃得營養、吃出健康”是人們普遍的飲食追求,下列說法不正確的是A.人每天都應攝入一定量的蛋白質B.過量食用油脂...
問題詳情:“吃得營養、吃出健康”是人們普遍的飲食追求,下列說法不正確的是A.人每天都應攝入一定量的蛋白質B.過量食用油脂能使人發胖,故應禁止攝入油脂C.糖類是人體能量的重要來源D.過量攝入微量元素不利於健康【回答】B知識點:各地會考題型:選擇題...
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