题目内容

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Birds in cities are damaging their health by trying to sing above the noise of urban life．

New research shows that male birds are trying to compete against traffic and city sounds．They are now singing louder and at higher frequencies，which could harm their vocal cords．Some birds are choosing to sing at night instead of dudng the day．This makes them more open to attack and also creates stress and exhanstion．

“The difference between urban and rural birdsong is becoming so big that the two groups could now be unable to communicate．This could lead to inbreeding and a weak gene pool．”said Dr Sue Anne Zollinger of the University of St Andrews．

According to Zollingar,a bird group with a small geae pool might adapt less quickly to new diseases and could be wiped out．

A study of the dawn chorus found that birds in Berlin sang up to 14 decibels(分贝)louder than those in the forest．The birds sang loudest on weekday momings．

“By trying to sing over the sound of the city,birds are rising vocal injury,”said Zollinger．“All this puts the sarne strain on a bird’s vocal cords as when  ahuman need to shout to be heard—except the birds are doing it all day,every day,”she said．

“Singing under such pressure means birds have less control over the sound they produce． Their songs may lose quality and become more rough—sounding．”said Zollinger．This could make them appear less attractive to female birds．

Mark Constantine，author of The Sound Approach to Birding，said：“Birdsong is important for our quality of life and has been proved to reduce our blood pressure．When we live in the centre of large，urban areas，we get stressed and it's extremely good to have birdsong around us．The impact on humans of birdsong is massive．It harms us，as well as the birds，if their songs become louder and simpler

53．Some birds in cities now choose to sing at night time because_______．

A．they want to attract more birds of opposite sex

B．they are more likely to be discovered by their family

C．they can’t adapt to the loud noises during the daytime

D．they have to frighten their enemy away

54．According to the passage，urban and rural birds might not be able to_______．

A．recognize each other

B  communicate with each other

C  live with each other

D．compete against each other

55．It requires greatest efforts for birds in cities to sing o_______．

A．Monday nights            B．Wednesday afternoons

C．Saturday Evenings         D．Friday momings

56．According to Dr Sue Anne Zollinger,birds singing louder might eventually lead to_______．

A．the harm done to man’s health

B  the dying out of a species

C．the serious damage to the bird’s vocal cords

D．the decrease ofthe birth rate ofa bird group

 

【答案】

53---56   CBDB

【解析】略

 

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1.The underlined word fractured here probably means ___________.

A. shaken         B. broken        C. abandoned            D. touched

2.The girl didn't want to answer the boy's' call because ____________.

A. she didn't hear it                 B. she was seriously hurt

C. she was angry with him             D. she had her phone broken

3.Which of the following words may best describe the boy’s behavior?

A.gentle and devoted      B.brave and handsome

C.rough and selfish   D.intelligent but silly

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A.love is happy and love is pain

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    Earlier studies have recorded 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 groups led researchers to predict extra alertness in the end-of-the-row sleepers which tend to be attacked more easily. 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(注视) direction.

    Also, birds napping (打盹) at the end of the line depend on single-hemisphere sleep, rather than total relaxation, more often than inner ducks did. Turning 16 birds through the positions in a four-duck row, the researchers found that compared with 12 percent for birds in inner spots, outer birds half-asleep during some 32 percent of napping time.

    “We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness at the same time in different regions of the brain,” the researchers say.

    The results provide the best evidence for a long-standing assumption that single-hemisphere sleep developed over time 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 napping 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 animals 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.” He supposes that more examples may turn up when we take a closer look at other species.

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    A. they have to watch out for possible attacks

    B. their brain hemispheres take turns to rest

    C. the two halves of their brain are differently organized

    D. they have to constantly keep an eye on their companions

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    A. An imagined companion gives the bird a sense of security.

    B. Birds prefer to sleep in pairs for the sake of their security.

    C. The phenomenon of birds napping in pairs is widespread.

D. A single pet bird enjoys seeing its own reflection in the mirror.

3.It can be inferred that _______.

A. Birds never sleep with both hemispheres resting at once.

B. Inner ducks depend on single-hemisphere sleep, rather than total relaxation, as often as birds napping at the end of the line do

C. It is not the first time for scientists to research on birds’ half-brain sleep 

D. Birds hardly sleep without a companion

4.By saying “just the tip of the iceberg”, Siegel suggests that _______.

    A. half-brain sleep has something to do with icy weather

    B. the mystery of half-brain sleep is close to being solved

    C. most birds living in cold regions tend to be half sleepers

    D. half-brain sleep may exist among other species

 

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