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For more than twenty years scientists have been seeking to understand the mystery of the ‘‘sixth sense" of direction.By trying out ideas and solving problems one by one,they are now getting closer to one answer.

One funny idea is that animals might have a built-in compass(指南針).

Our earth itself is a big magnet(磁體).So a little magnetic needle that swings freely lines

itself with the big earth magnet to point north When people discovered that idea about a thousand years ago and invented the compass,it allowed sailors to navigate (航海)on ocean voyages, even under cloudy skies.

 Actually the idea of the living compass came just from observing animals in nature.

 Many birds migrate twice a year between their summer homes and winter homes.Some of them fly for thousands of kilometers and mostly at night.Experiments have shown that some birds can recognize star patterns.But they can keep on course even under cloudy skies.How can they do that?

A common bird that does not migrate but is great at finding its way home is the homing pigeon.Not all pigeons can find their way home.Those that can are very good at it,and they have been widely studied.

One interesting experiment was to attach little magnets to the birds’ heads to block their magnetic sense—just as a loud radio can keep you from hearing a call to dinner.On sunny days, that did not fool the pigeons.Evidently they can use the sun to tell which way they are going.But on cloudy days,the pigeons with magnets could not find their way.It was as if the magnets had blocked their magnetic sense.

Similar experiments with the same kind of results were done with honeybees.These insects also seem to have a special sense of direction.

In spite of the experiments,the idea of an animal compass seemed pretty extraordinary.How

would an animal get the magnetic stuff for a compass.

An answer came from an unexpected source.A scientist was studying bacteria that live in the

mud of ponds and marshes.He found accidentally little rod-like bacteria that all swam together inone direction—north.

Further study showed that each little bacterium had a chain of dense particles inside,which

proved magnetic.The bacteria had made themselves into little magnets that could line up with the

earth’s magnet.

The big news was that a living thing,even a simple bacterium,can make magnetite.That led

to a search to see whether animals might have it.. By using a special instrument called magnetometer,scientists were able to find magnetite in bees and birds,and even in fish.In each  animal,except for the bee.the magnetic stuff was always in or closer to the brain.Thus.the idea of a built—in animal compass began to seem reasonable.

 

The Magnetic Sense — The Living Compass

Passage outline

Supporting details

The existence of the earth magnet and the invention of the navigating compass

◇Our earth is a big magnet and a little freely (56)     

  magnetic needle lines itself with the earth magnet to point north and south.

◇(57)       on the idea above, the navigating compass was invented.

The possibility of birds’ built-in compasses

◇ One piece of evidence is the (58)        of many birds between their summer homes and winter homes.

◇ Birds can recognize star patterns on clear nights and keep on course (59)         under cloudy skies 

The  (60)         on pigeons’ and bees’ built-in compasses

 

◇Little magnets were tied to the pigeons’ heads to (61)         their magnetic sense.

◇The pigeons’ magnetic sense seemed to be affected on (62)        days.

◇Similar things with the same results were done with bees.

The  (63)         of the magnetic stuff for the animal compass

◇Little rod-like bacteria were found by chance to swim together in the direction of (64)        .

◇Some animals had a chain of dense magnetic particles in or close to the (65)         inside their bodies.

 

【答案】

 

 swinging

 Based

 migration

 even

 experiments/tests/study/research

 block

 cloudy

 discovery

 north

 brain(s)

【解析】

試題分析:

 swinging   詞性轉(zhuǎn)換。根據(jù)第三段a little magnetic needle that swings freely lines把定語從句轉(zhuǎn)換成現(xiàn)在分詞短語修飾名詞needle。

 Based   同義轉(zhuǎn)換。根據(jù)第三段When people discovered that idea about a thousand years ago and invented the compass說明人們是根據(jù)這個原理發(fā)明了指南針。Be based on…以…為基礎(chǔ)。

 migration  詞性轉(zhuǎn)換。根據(jù)第六段Many birds migrate twice a year中的動詞migrate轉(zhuǎn)換成名詞。

 even  原詞再現(xiàn)。   根據(jù)第三段最后一句it allowed sailors to navigate (航海)on ocean voyages, even under cloudy skies. 中的even. experiments/tests/study/research    根據(jù)文章第7,8段One interesting experiment可知是對鴿子和蜜蜂身上做的實(shí)驗(yàn)。

 block     原詞再現(xiàn)  根據(jù)It was as if the magnets had blocked their magnetic sense.

 cloudy    原詞再現(xiàn) 根據(jù)第六段But on cloudy days,the pigeons with magnets could not。

 discovery   推理題。根據(jù)文章倒數(shù)第四段How would an animal get the magnetic stuff for a compass.

接下來的幾段都是講述實(shí)驗(yàn)的發(fā)現(xiàn)。

 north    原詞再現(xiàn)。根據(jù)倒數(shù)第三段最后一行that all swam together inone direction—north.

 .brain(s) 根據(jù)文章倒數(shù)第二行the magnetic stuff was always in or closer to the brain.

考點(diǎn):考查任務(wù)型閱讀

點(diǎn)評:任務(wù)型閱讀要求考生對文章的篇章結(jié)構(gòu)的和表格的結(jié)構(gòu)要有清楚的理解,對于同義詞和近義詞的轉(zhuǎn)換已經(jīng)詞性和詞形的變化要善于總結(jié)。

 

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