题目内容
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A new study on birds’ sleep has revealed that ________.
A) half brain sleep is found in a wide variety of birds
B) half brain sleep is characterized by slow brain waves
C) birds can control their half brain sleep consciously
D) birds seldom sleep with the whole of their brain at rest
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Earlier Studies have documented half-brain sleep in a wide range of birds. The brain hemispheres take turns sinking into the sleep stage characterized by slow brain waves. The eye controlled 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, end-of-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, 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 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 a long-standing supposition that single- hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the. lockout 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 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 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 ______
A．half-brain sleep is found in all kinds of birds
B．half-brain sleep is characterized by accelerated brain waves
C．birds can control their half-brain sleep consciously
D．birds always sleep with the whole of their brain at rest
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 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 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 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 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 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 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. 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 new study on birds' sleep has revealed that _________.
A．half-brain sleep is found in a wide variety of birds
B．half-brain sleep is characterized by slow brain waves
C．birds can control their half-brain sleep consciously
D．birds seldom sleep with the whole of their brain at rest
understanding of how many stars there are in the galaxy than how many species there are on Earth？ Their estimates of global species diversity vary from 2 to 100 million species. Most people agree on an estimate of somewhere near 10 million and yet only 1.75 million have actually been named. Current knowledge of species diversity is limited. This problem becomes more serious because there is a lack of a central database or list of the world’s species.
New species are still being discovered — even new birds and mammals(哺乳动物). On average, about three new species of birds are found each year, and since 1990, 10 new species of monkeys have been discovered. Other groups are still far from being completely described: an estimated 40 percent of freshwater fishes in South America have not yet been classified.
Scientists were startled in 1980 by the discovery of a huge diversity of insects in tropical forests. In one study of just 19 trees in Panama, 960 new species of beetles were discovered.
As scientists begin investigating other little-known ecosystem, like the soil and the deep sea, “surprising” discoveries of species become commonplace. There is nothing strange about this, though, since as many as a million undescribed species are believed to live in the deep sea. And one gram of a small-sized piece of land might hold 90 million bacteria(菌类) and other microbes(微生物). How many species these communities contain is still anyone’s guess.
16. Which of the following is true？
A) Scientists have a sound knowledge about the diversity of species
B) Scientists don’t know much about the number of stars in the galaxy
C) Scientists show more interest in stars in the galaxy than in species on Earth
D) Scientists don’t agree on the number of species in the world
17. How many species are there on Earth according to most scientists？
A) About 2 million
B) About 10 million
C) About 100 million
D) About 1.75 million
18. In which of the following groups is the discovery of new species not mentioned in
the passage？
A) Birds
B) Monkeys
C) Trees
D) Freshwater fish
19. What can you learn from the passage？
A) The soil and the deep sea belong to communities that haven’t been fully explored
B) It is surprising news wherever new species are discovered in the deep sea
C) About 90 million species are believed to live in the deep sea
D) A million species in the deep sea have been discovered and named
20. Which of the following best reveals the main idea of the passage？
A) Surprising discoveries of new species are commonplace
B) The mystery of the deep sea and the soil remains to be uncovered
C) Knowledge of global species diversity is still limited
D) Estimates of global species diversity vary among scientists
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： The world has become a noisier place, say experts at the Library of Natural Sounds in Ithaca, New York. The library has the world's largest collection of natural sound recordings---including the sound of birds, frogs, and mammals. The recordings are used for scientific study, field guides, and even some movie background sounds. Finding quiet areas for recording is becoming difficult, says Greg Budney, head of the library. Even in sparsely populated areas, animal sounds can be submerged by moving trucks, highway traffic, or aircraft. Obtaining a clean recording of an animal may take days or even years, and a habitat recording of all the species in an area is virtually impossible. Animals are having trouble heating each other in loud noises as well. A report from the British Ecological Society claims that, because of noise from nearby British roadways, some birds are having trouble attracting mates and staking out their territories.
(27)
A．For scientific study.
B．For field guides.
C．For entertainment.
D．For some film background sounds.
A．acquisition
B．discrimination
C．curiosity
D．familiarity
A.Habitats.
B.Ornithology.
C.Collision.
D.Reflection.
Listening to Birdsong
A male zebra finch(雀科鸣鸟) chirps(鸣) away to himself. Suddenly he notices a female bird nearby. He realizes he has an audience and immediately changes his song. Can the female tell the difference in his performance？ According to a new study, the female zebra finch knows. And she prefers the special trills(啭音) he creates when he sings to her. A male zebra finch changes his song when singing to a female in ways that people can barely detect. But the female finch can tell the difference.
Scientists had noticed slight variations in the songs of male zebra finches based on whether they were singing alone or whether there was a female (and potential mate) nearby. With an audience, the males sped up the pace of their songs and controlled the notes they used.
For this study, researchers Sarah C. Woolley and Allison Doupe at the University of California, San Francisco decided to focus attention on the listening females, which have not been well studied in the past.
In the study, Woolley and Doupe set up a long cage with a sound speaker at each end. One broadcast the sound of a male zebra finch singing to himself, like someone singing in the shower. The other speaker broadcast a male performing for a female audience, as if he was giving a concert.
Female birds were placed between the two speakers. Some of the birds had mates, others didn't. The females shifted around a bit, and then most of them hopped over to sit beside just one speaker. All the birds that made a clear choice liked songs meant for a female audience, even if they'd never met the male.
Mated females also had a chance to listen to two different performance songs, one from an unknown male, and one from their mate. They spent more time listening to the concert version of their mates' songs. This suggests that after a while, females learn to recognize—and prefer—the songs of their mates.
Scientists then studied the brains of the females. They found certain areas of the brain perked up (活跃起来) when the birds listened to the concert songs. These brain areas may be involved in recognizing and evaluating the songs, and storing the memories of them.
This research deals with what's called directed communication, when the communicator, or sender, focuses the message for a specific audience. One example is the way moms speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter(喋喋不休), and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication, in this case their songs.
Which of the following is true about birdsongs？
A．Female zebra finches are too shy to sing before males.
B．Male zebra finches sing louder than females.
C．Female zebra finches like to listen to unknown males sing.
D．Male zebra finches change their songs to attract females.
第二篇
Listening to Birdsong
A male zebra finch (雀科鸣鸟) chirps (鸣) away to himself. Suddenly he notices a female bird nearby. He realizes he has an audience and immediately changes his song. Can the female tell the difference in his performance？ According to a new study, the female zebra finch knows. And she prefers the special trills he creates when he sings to her. A male zebra finch changes his song when singing to a female in ways that people can barely detect. But the female finch can tell the difference.
Scientists had noticed slight variations in the songs of male zebra finches based on whether they were singing alone or whether there was a female (and potential mate) nearby. With an audience, the males sped up the pace of their songs and controlled the notes they used.
For this study, .researchers Sarah C. Woolley and Allison Doupe at the University of California, San Francisco decided to focus attention on the listening females, which have not been well studied in the past.
In the study, Woolley and Doupe set up a long cage with a sound speaker at each end. One broadcast the sound of a male zebra finch singing to himself, like someone singing in the shower. The other speaker broadcast a male performing for a female audience, as if he was giving a concert.
Female birds were placed between the two speakers. Some of the birds had mates, others didn't. The females shifted around a bit, and then most of them hopped over to sit beside just one speaker. All the birds that made a clear choice liked songs meant for a female audience, even if they'd never met the male.
Mated females also had a chance to listen to two different performance songs, one from an unknown male, and one from their mate. They spent more time listening to the concert version of their mates' songs, this suggests that after a while, females learn to recognize - and prefer - the songs of their mates.
Scientists then studied the brains of the females. They found certain areas of the brain perked up (活跃起来) when the birds listened to the concert songs. These brain areas may be involved in recognizing and evaluating the songs, and storing the memories of them.
This research deals with what's called directed communication, when the communicator, or sender, focuses the message for a specific audience. One example is the way morns speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter (喋喋不休), and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication, in this case their songs.
36 Which of the following is true about birdsongs？
A Female zebra finches are too shy to sing before males.
B Male zebra finches sing louder than females.
C Male zebra finches change their songs to attract females.
D Female zebra finches like to listen to unknown males sing
Listening to Birdsong
A male zebra finch chirps away to himself. Suddenly he notices a female bird, nearby: He realizes he has an audience and immediately changes his song. Can the female tell the difference in his performance？ According to a new study, the female zebra finch knows. And she prefers the special trills he creates when he sings to her. A male zebra finch changes his song when singing to a female in ways that people can barely detect. But the female finch can tell the difference.
Scientists had noticed slight variations in the songs of male zebra finches based on whether they were singing alone or whether there was a female(and potential mate)nearby. With an audience, the males sped up the pace of their songs and controlled the notes they used. For this study, researchers Sarah C. Woolley and Allison Doupe at the University of California, San Francisco decided to focus attention on the listening females, which have not been well studied in the past. In the study, Woolley and Doupe set up a long cage with a sound speaker at each end. One broadcast the sound of a male zebra finch singing to himself, like someone singing in the shower. The other speaker broadcast a male performing for a female audience, as if he was giving a concert.
Female birds were placed between the two speakers. Some of the birds had mates, others didn’t. the females shifted around a bit, and then most of them hopped over to sit beside just one speaker. All the birds that made a clear choice liked songs meant for a female audience, even if they’d never met the male.
Mated females also had a chance to listen to two different performance songs, one from an unknown male, and one from their mate. They spent more time listening, to the concert version of their mates’ songs. This suggests that after a while, females learn to recognize-and prefer-the songs of their mates.
Scientists then studied the brains of the females. They found certain areas of the brain perked up when the brids listened to the concert songs. These brain areas may be involved in recognizing and evaluating the songs, and storing the memories of them. This research deals with what’s called directed communication, when the communicator, or sender, focuses the message for a specific audience. One example is the way morns speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter, and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication, in this case their songs.
第31题 What does the first paragraph say about zebra finches？
A Male zebra finches like to sing to female zebra finches.
B Male zebra finches sing louder than female zebra finches.
C Male zebra finches change their songs in female zebra finches’presence.
D Male zebra finches like to listen to female zebra finches sing.
Thorpe of Cambridge University found that the chaffinch has to learn most of its songs, and that this learning has to occur during the early weeks of the bird's life and also during the first spring. If the bird is handreared and isolated from other birds from the time of hatching, it sings only very simple songs and it never learns the song of its species correctly.
That we speak our own language perfectly and the languages we learn later imperfectly also depends on learning this skill at the right time. The brain develops in such a way that it is ready to learn to speak between the ages of about ten months and ten years. Languages learned later are not spoken perfectly. The ability to speak a language is a mixed motor and sensory skill. It is necessary to hear all the sounds, the subtle differences between similar but not identical sounds, the rhythm and lilt of the language. One has also to work tongue, throat, and lips, to control breathing. All this has to be managed at one and the same time. From some time after birth until the age of six or seven, normal children can learn all this perfectly, and without much difficulty they can learn two or even three languages at the same time, without muddling them up. But later, most of us cannot acquire this skill. We may learn to write and read the new language perfectly; but to acquire the right inflexion and the accent and the ability to speak so that no one can detect that the language is not our mother-tongue hardly ever occurs.
But those of us who still want to learn foreign languages after these early milestones have been passed need not worry; for though we may not learn to speak a new language like the natives, we know from thousands of examples that we can go on learning languages beyond the age of eighty. There are so many activities adding to the simple word "learning" that although some of the processes become less efficient with ageing of the brain, our actual experience of learning helps us in learning new material.
According to the study by Thorpe, a chaffinch reared in isolation after its birth ______.
A．never sings
B．cannot learn songs from other species of birds
C．never sings as well as other chaffinches
D．sings the same song all the time
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