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1、2023年湖北公共英语考试真题卷（6）本卷共分为1大题50小题，作答时间为180分钟，总分100分，60分及格。一、单项选择题（共50题，每题2分。每题的备选项中，只有一个最符合题意） 1.Birds that are literally half-asleep-with one brain hemisphere alert and the other sleeping- control which side of the brain remains awake, according to a new study of sleeping ducks.Earlier studies have d
2、ocumented half-brain sleep in a wide range of birds. The brain hemi- spheres take turns sinking into the sleep stage characterized by slow brain waves. The eye con- trolled by the sleeping hemisphere keeps shut, while the wakeful hemisphere’ s eye stays open and alert. Birds also can sleep wit
3、h both hemispheres resting at once.Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end-or-the-row sleepers. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference
4、for gaze direction.Also, birds dozing(打盹) at the end of the line resorted to single-hemisphere sleep, rather than total relaxation, more often than inner ducks did. Rotating 16 birds through the positions in a four-duck row, the researchers found outer birds half-asleep during some 32 percent of doz
5、ing time versus about 12 percent for birds in internal spots.We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness simultaneously in different regions of the brain, the researchers say.The results provide the best evidence for a long-standing supposition
6、that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be widespread, he predicts. He’s seen it in a pair of birds dozing side-by-side in the zoo and in a single pet bird sleeping by a mirror. The mirror-side eye close
7、d as if the reflection were a companion and the other eye stayed open.Useful as half-sleeping might be, it’s only been found in birds and such water mammals(哺乳动物) as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avo
8、id drowning.Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds’ half-brain sleep is just the tip of the iceberg (冰山). He speculates that more examples may turn up when we take a closer look at other species.The example of a bird sleepin
9、g in front of a mirror indicates that ().Athe phenomenon of birds dozing in pairs is widespreadBBirds prefer to sleep in pairs for the sake of securityCeven an imagined companion gives the bird a sense of securityDa single pet bird enjoys seeing its own reflection in the mirror2.Birds that are liter
10、ally half-asleep-with one brain hemisphere alert and the other sleeping- control which side of the brain remains awake, according to a new study of sleeping ducks.Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemi- spheres take turns sinking into the sleep stag
11、e characterized by slow brain waves. The eye con- trolled by the sleeping hemisphere keeps shut, while the wakeful hemisphere’ s eye stays open and alert. Birds also can sleep with both hemispheres resting at once.Decades of studies of bird flocks led researchers to predict extra alertness in
12、the more vulnerable, end-or-the-row sleepers. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference for gaze direction.Also, birds dozing(打盹) at the end of the line resorted to single-hemisphere sleep, rather than t
13、otal relaxation, more often than inner ducks did. Rotating 16 birds through the positions in a four-duck row, the researchers found outer birds half-asleep during some 32 percent of dozing time versus about 12 percent for birds in internal spots.We believe this is the first evidence for an animal be
14、haviorally controlling sleep and wakefulness simultaneously in different regions of the brain, the researchers say.The results provide the best evidence for a long-standing supposition that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the loo
15、kout side could be widespread, he predicts. He’s seen it in a pair of birds dozing side-by-side in the zoo and in a single pet bird sleeping by a mirror. The mirror-side eye closed as if the reflection were a companion and the other eye stayed open.Useful as half-sleeping might be, it’s
16、only been found in birds and such water mammals(哺乳动物) as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning.Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if
17、birds’ half-brain sleep is just the tip of the iceberg (冰山). He speculates that more examples may turn up when we take a closer look at other species.A new study on birds sleep has revealed that ().Ahalf-brain sleep is found in a wide variety of birdsBhalf-brain sleep is characterized by slow
18、brain wavesCbirds can control their half-brain sleep consciouslyDbirds seldom sleep with the whole of their brain at rest3.Birds that are literally half-asleep-with one brain hemisphere alert and the other sleeping- control which side of the brain remains awake, according to a new study of sleeping
19、ducks.Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemi- spheres take turns sinking into the sleep stage characterized by slow brain waves. The eye con- trolled by the sleeping hemisphere keeps shut, while the wakeful hemisphere’ s eye stays open and ale
20、rt. Birds also can sleep with both hemispheres resting at once.Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end-or-the-row sleepers. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner
21、 spots showed no preference for gaze direction.Also, birds dozing(打盹) at the end of the line resorted to single-hemisphere sleep, rather than total relaxation, more often than inner ducks did. Rotating 16 birds through the positions in a four-duck row, the researchers found outer birds half-asleep d
22、uring some 32 percent of dozing time versus about 12 percent for birds in internal spots.We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness simultaneously in different regions of the brain, the researchers say.The results provide the best evidence for
23、a long-standing supposition that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be widespread, he predicts. He’s seen it in a pair of birds dozing side-by-side in the zoo and in a single pet bird sleeping by a mirro
24、r. The mirror-side eye closed as if the reflection were a companion and the other eye stayed open.Useful as half-sleeping might be, it’s only been found in birds and such water mammals(哺乳动物) as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to
25、 surface occasionally to avoid drowning.Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds’ half-brain sleep is just the tip of the iceberg (冰山). He speculates that more examples may turn up when we take a closer look at other species.A
26、ccording to the passage, birds often half sleep because ().Athey have to watch out for possible attacksBtheir brain hemispheres take turns to restCthe two halves of their brain are differently structuredDthey have to constantly keep an eye on their companions4.Birds that are literally half-asleep-wi
27、th one brain hemisphere alert and the other sleeping- control which side of the brain remains awake, according to a new study of sleeping ducks.Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemi- spheres take turns sinking into the sleep stage characterized by
28、slow brain waves. The eye con- trolled by the sleeping hemisphere keeps shut, while the wakeful hemisphere’ s eye stays open and alert. Birds also can sleep with both hemispheres resting at once.Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable
29、, end-or-the-row sleepers. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference for gaze direction.Also, birds dozing(打盹) at the end of the line resorted to single-hemisphere sleep, rather than total relaxation, mo
30、re often than inner ducks did. Rotating 16 birds through the positions in a four-duck row, the researchers found outer birds half-asleep during some 32 percent of dozing time versus about 12 percent for birds in internal spots.We believe this is the first evidence for an animal behaviorally controll
31、ing sleep and wakefulness simultaneously in different regions of the brain, the researchers say.The results provide the best evidence for a long-standing supposition that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be
32、widespread, he predicts. He’s seen it in a pair of birds dozing side-by-side in the zoo and in a single pet bird sleeping by a mirror. The mirror-side eye closed as if the reflection were a companion and the other eye stayed open.Useful as half-sleeping might be, it’s only been found in
33、birds and such water mammals(哺乳动物) as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning.Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds’ half-b
34、rain sleep is just the tip of the iceberg (冰山). He speculates that more examples may turn up when we take a closer look at other species.By “just the tip of the iceberg” (Line 2, ParA8), Siegel suggests that ().A. half-brain sleep has something to do with icy weatherB. the mystery of half-brain slee
35、p is close to being solvedC. most birds living in cold regions tend to be half sleepersD. half-brain sleep is a phenomenon that could exist among other species5.Birds that are literally half-asleep-with one brain hemisphere alert and the other sleeping- control which side of the brain remains awake,
36、 according to a new study of sleeping ducks.Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemi- spheres take turns sinking into the sleep stage characterized by slow brain waves. The eye con- trolled by the sleeping hemisphere keeps shut, while the wakeful hemi
37、sphere’ s eye stays open and alert. Birds also can sleep with both hemispheres resting at once.Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end-or-the-row sleepers. Sure enough, the end birds tended to watch carefully on the side away fro
38、m their companions. Ducks in the inner spots showed no preference for gaze direction.Also, birds dozing(打盹) at the end of the line resorted to single-hemisphere sleep, rather than total relaxation, more often than inner ducks did. Rotating 16 birds through the positions in a four-duck row, the resea
39、rchers found outer birds half-asleep during some 32 percent of dozing time versus about 12 percent for birds in internal spots.We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness simultaneously in different regions of the brain, the researchers say.The
40、results provide the best evidence for a long-standing supposition that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be widespread, he predicts. He’s seen it in a pair of birds dozing side-by-side in the zoo and in
41、 a single pet bird sleeping by a mirror. The mirror-side eye closed as if the reflection were a companion and the other eye stayed open.Useful as half-sleeping might be, it’s only been found in birds and such water mammals(哺乳动物) as dolphins, whales, and seals. Perhaps keeping one side of the b
42、rain awake allows a sleeping animal to surface occasionally to avoid drowning.Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds’ half-brain sleep is just the tip of the iceberg (冰山). He speculates that more examples may turn up when we
43、 take a closer look at other species.Compared with other TV talk shows, both the Jerry Springer and the Oprah Winfrey are ().A. more family-orientedC. more profoundB. unusually popularD. relatively formal6.Birds that are literally half-asleep-with one brain hemisphere alert and the other sleeping- c
44、ontrol which side of the brain remains awake, according to a new study of sleeping ducks.Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemi- spheres take turns sinking into the sleep stage characterized by slow brain waves. The eye con- trolled by the sleeping
45、hemisphere keeps shut, while the wakeful hemisphere’ s eye stays open and alert. Birds also can sleep with both hemispheres resting at once.Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end-or-the-row sleepers. Sure enough, the end birds t
46、ended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference for gaze direction.Also, birds dozing(打盹) at the end of the line resorted to single-hemisphere sleep, rather than total relaxation, more often than inner ducks did. Rotating 16 birds throug
47、h the positions in a four-duck row, the researchers found outer birds half-asleep during some 32 percent of dozing time versus about 12 percent for birds in internal spots.We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness simultaneously in different r
48、egions of the brain, the researchers say.The results provide the best evidence for a long-standing supposition that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be widespread, he predicts. He’s seen it in a pair o
49、f birds dozing side-by-side in the zoo and in a single pet bird sleeping by a mirror. The mirror-side eye closed as if the reflection were a companion and the other eye stayed open.Useful as half-sleeping might be, it’s only been found in birds and such water mammals(哺乳动物) as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning.Studies of birds may offer unique insights into sleep. Jerome M.