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Night of the Living Ants When an ant dies,other ants move the dead insect out of the nest.

Night of the Living Ants

When an ant dies,other ants move the dead insect out of the nest.This behavior. is interesting to scientists,who wonder how ants know for sure-and so soon-that another ant is dead.

Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,“I’m dead-take me away.”

But there's a twist to Choe's discovery.Choe says that the living ants-not just the dead ones -have this death chemical.In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.

What keeps ants from hauling away the living dead?Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,“Wait-I'm not dead yet.” So Choe's research turned up two sets of chemical signals in ants:one says,“I'm dead,”the other set says,“I'm not dead yet.”

Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.

Choe suspects that when an Argentine ant dies.the chemical that says“Wait-I'm not dead yet” quickly goes away.Once that chemical is gone,only the one that says“I'm dead”is left.“It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard(墓地),not because its body releases new,unique chemicals after death,”said Choe.When other ants detect the“dead”chemical without the“not dead yet”chemical,they haul away the body.This was Choe's hypothesis(假设).

To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae(蛹). When the scientists used the“I'm dead”chemical,other ants quickly hauled the treated pupae away. When the scientists used the“Wait-I'm not dead yet”chemical,other ants left the treated pupae alone. Choe believes this behavior. shows that the“not dead yet”chemical overrides(优胜于)the“dead”chemical when picked up by adult ants.And that when an ant dies,the“not dead yet”chemical fades away. Other nearby ants then detect the remaining“dead”chemical and remove the body from the nest.

The phrase“this death chemical”in paragraph 3 refers to

A.the chemical that contains poison.

B.the chemical that announces death.

C.the chemical that prevents death.

D.the chemical that causes death.

查看参考答案
更多“Night of the Living Ants When an ant dies,other ants move the dead insect out of the nest.”相关的问题

第1题

翻译以下文章 Large modern cities are too big to control. They impose their own living conditions on people.

翻译以下文章

Large modern cities are too big to control. They impose their own living conditions on people. City inhabitants are forced by their environment to adopt a wholly unnatural way of life. They lose touch with nature. It is possible to live such an air-conditioned life in a large city that you are barely conscious of the seasons. A few flowers in a public park (if you have the time to visit it) may remind you that it is spring or summer. A few leaves falling down from trees may remind you that it is autumn. Beyond that, what is going on in nature seems totally irrelevant. All the simple, good things of life—like sunshine and fresh air—are rare and precious. Tall buildings block the sun. Traffic fumes pollute the atmosphere. Even the distinction between day and night is lost. The flow of traffic goes on unceasingly and the noise never stops.

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第2题

Night of the Living Ants When an ant dies,other ants move the dead insect out of the nest.

Night of the Living Ants

When an ant dies,other ants move the dead insect out of the nest.This behavior. is interesting to scientists,who wonder how ants know for sure-and so soon-that another ant is dead.

Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,“I’m dead-take me away.”

But there's a twist to Choe's discovery.Choe says that the living ants-not just the dead ones -have this death chemical.In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.

What keeps ants from hauling away the living dead?Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,“Wait-I'm not dead yet.” So Choe's research turned up two sets of chemical signals in ants:one says,“I'm dead,”the other set says,“I'm not dead yet.”

Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.

Choe suspects that when an Argentine ant dies.the chemical that says“Wait-I'm not dead yet” quickly goes away.Once that chemical is gone,only the one that says“I'm dead”is left.“It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard(墓地),not because its body releases new,unique chemicals after death,”said Choe.When other ants detect the“dead”chemical without the“not dead yet”chemical,they haul away the body.This was Choe's hypothesis(假设).

To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae(蛹). When the scientists used the“I'm dead”chemical,other ants quickly hauled the treated pupae away. When the scientists used the“Wait-I'm not dead yet”chemical,other ants left the treated pupae alone. Choe believes this behavior. shows that the“not dead yet”chemical overrides(优胜于)the“dead”chemical when picked up by adult ants.And that when an ant dies,the“not dead yet”chemical fades away. Other nearby ants then detect the remaining“dead”chemical and remove the body from the nest.

The phrase“this death chemical”in paragraph 3 refers to

A.the chemical that contains poison.

B.the chemical that announces death.

C.the chemical that prevents death.

D.the chemical that causes death.

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第3题

A.finally B.sneak C.on D.practicing E.soIt was soon clear I couldn't stay in China f

A.finally B.sneak C.on D.practicing E.so

It was soon clear I couldn't stay in China forever.To become a world-class musician,I had to play _____1 the world's big stages.So in 1997,my father and I moved again,this time to Philadelphia,______2 .I could attend the Curtis Institute of Music.____3 our money worries were easing.The school paid for an apartment and even lent me a Steinway(斯坦威钢琴)。At night,I would _____4 into the living room just to touch the keys.

Now that I was in America,I wanted,to become famous,but my new teachers reminded me that I had a lot to learn.I spent two years____5,and by 1999 I had worked hard enough for fortune to take over.The Chicago Symphony orchestra heard me play and liked me,but orchestra schedules were set far in advance.I thought I might join them in a few years.

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第4题

听力原文:Dear Sir, Last night I watched a Party Political broadcast on television. It was

听力原文:Dear Sir,

Last night I watched a Party Political broadcast on television. It was on behalf of the present government and in it the Prime Minister outlined the aims of the government. It made me very angry.

To be fair, their plans for the future of this country are certainly interesting. They say they are going to build more day nurseries for mothers who go out to work, they say they are going to build more schools and increase the grants of university and college students. Then they say they are going to reduce unemployment; improve the National Health Service; cut the cost of dental treatment. And they say they intend to reduce the level of personal taxation. In the same breath they say they are going to cut inflation and thereby reduce the cost of living and help family budgets. Oh, yes, I nearly forgot. They are going to spend millions of pounds on a nuclear defense system to protect us from an enemy attack.

But the question I want to ask is: where are they going to get all the money to put their ideas into practice? Well, I think 1 know the answer. The money is going to come out of the taxpayers' pocket. That's fight. It's you and me who are going to pay the bill.

Sir, may I suggest the present state of the national economy means these plans are not only unrealistic, they're irresponsible and completely unbelievable.

Yours faithfully,

Jennifer Hudson

Why is the woman writing the letter?

A.Because she feels satisfied with the government.

B.Because she feels angry with the government.

C.Because she feels disappointed with the government.

D.Because she feels proud of the government.

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第5题

It was soon clear I couldn't stay in China forever. To become a world-class musici
an, I had to play ______ the world's big stages. So in 1997, my father and I moved again, this time to Philadelphia, ______ I could attend the Curtis Institute of Music. ______ our money worries were easing. The school paid for an apartment and even lent me a Steinway (斯坦威钢琴). At night, I would _____ into the living room just to touch the keys. Now that I was in America, I wanted to become famous, but my new teachers reminded me that I had a lot to learn. I spent two years ______, and by 1999 I had worked hard enough for fortune to take over. The Chicago Symphony orchestra heard me play and liked me, but orchestra schedules were set far in advance. I thought I might join them in a few years.

1.A.Finally

B.sneak

C.on

D.practicing

E.so

2.A.Finally

B.sneak

C.on

D.practicing

E.so

3.A.Finally

B.sneak

C.on

D.practicing

E.so

4.A.Finally

B.sneak

C.on

D.practicing

E.so

5.A.Finally

B.sneak

C.on

D.practicing

E.so

点击查看答案

第6题

Television is the most effective brainwashing medium ever invented by man.Advertisers kn
ow this to be ().Children are affected by television in () we scarcely understand.

In the fall of 1971, I was () a story involving a young white woman living on the fringe (边缘) of Boston’s black ghetto.Her car had () out of gas.She had gone to a filling station () a can and was returning to her car when she was () in an alley by a gang of black youths.The gang () gasoline over her and set fire to her.She died () her burns.It was later established () some of the youths involved had, on the night before the killing, () on television a rerun of an old movie in which a drifter (流浪汉) is () on fire by an adolescent gang.There is some kind of strange reductive process (还原过程) at work here.To see something on television robs it () its reality, and then when the same thing is () out it is like the reenactment (重演) of something unreal.

() other words when the gang set fire to the girl, they were imitating () they had seen on a screen, as if they themselves were on a screen, and in a ().I don’t think we have () begun to realize how powerful a(n) () television is.It has already () very clear that the candidate with the most television () wins the election.

1.A.trueB.sincereC.dependantD.exact

2.A.methodsB.waysC.directionsD.respects

3.A.arrangedB.allottedC.appointedD.assigned

4.A.leftB.runC.stayedD.stopped

5.A.forB.byC.withD.in

6.A.tracedB.followedC.trappedD.hit

7.A.putB.pouredC.droppedD.sprayed

8.A.ofB.withC.inD.over

9.A.whenB.thatC.becauseD.as

10.A.lookedB.watchedC.experienceD.gone

11.A.setB.seenC.watchedD.burned

12.A.ofB.fromC.byD.for

13.A.actedB.playedC.putD.taken

14.A.OnB.InC.ByD.At

15.A.thatB.whichC.whatD.those

16.A.sceneB.fictionC.televisionD.story

17.A.evenB.alreadyC.muchD.little

18.A.equipmentB.applianceC.sourceD.medium

19.A.becomeB.turnedC.seemedD.looked

20.A.appearanceB.appealC.practiceD.experience

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第7题

Directions: There are three passages in this part.Each passage is followed by some questio
ns or unfinished statements.For each of them there are four choices marked A, B, C and D. You should decide on the best choice and blacken the corresponding letter on the Answer Sheet.

Passage 1

Questions are based on the following passage.

As prices and building costs keep rising, the"do-it-yourself"(DIY) trend (趋势) in the U.S.continues to grow.

"We needed furniture(家具) for our living room," says John Ross,"and we just didn't have enough money to buy it.So we decided to try making a few tables and chairs."(76) John got married six months ago, and like many, young people these days, they are straggling to make a home at a time when the cost of living is very high. The Rosses took a two-week course for $280 at a night school.Now they build all their furniture and make repairs around the house.

Jim Hatfield has three boys and his wife died.He has a full-time job at home as well as in a shoemaking factory. Last month, he received a car repair bill for $420."I was deeply upset about

it.Now I've finished a car repair course. I should be able to fix the car by myself."

John and Jim are not unusual people.In order to save money, most families in the country are doing everything they can so that they can fight the high cost of living.If you want to become a

"do-it-yourselfer," you can go to DIY classes.And for those who don't have time to take a course,

there are books that tell you how you can do things yourself.

We can learn from the text that many newly married people__________ 查看材料

A.find it hard to pay for what they need

B.have to learn to make their own furniture

C.take DIY courses run by the government

D.seldom go to a department store to buy things

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第8题

A Welcome GiftDario and his mother loved their new apartment. The living room was large en

A Welcome Gift

Dario and his mother loved their new apartment. The living room was large enough for their piano. That night, the two of them 36 side by side at the piano. They played jazz music to celebrate their new home. The loud 37 filled the room and made them feel very happy.

The next morning, 38 , their happiness disappeared. Someone had left a 39 under their door during the night. One of their neighbor had written to complain(抱怨) about the sound of the piano. Dario’s mother asked the building superintendent(管理员) if he knew anything about it. But he said that they were all 40 people and he couldn’t imagine any of them had done that. Later that morning, Dario suggested that they write a letter to their 41 and apologize for their playing.

“Maybe we could go and 42 everyone in person.” his mother said.

“What if we invited them to come here for a 43 instead? Dario asked.

They both loved the 44 . Over the next few days, they sent out invitations and prepared desserts 45 their guests. They decorated the apartment with streamers(彩带) and party lights.

Finally, the day of the party 46 . Some guests brought presents. Others brought flowers. Some even brought desserts to 47 . One woman, Mrs. Gilbert, 48 Dario’s mother with a book of piano music by Chopin.

“I heard you playing the other night,” she said. “The sounds woke me out of bed. I 49 that you might play like this every night. So I wrote a short note. I hope you don’t think I disliked the playing.”

Dario’s mother smiled at Mrs. Gilbert. “I think maybe we 50 you an apology.” she said. “I didn’t 51 how late it was when we were playing. Maybe we should play some quieter music at night.

“You play, you play!” Mrs. Gilbert said. “I like what you play! Just not so loud at night.” She pointed to the book she had given them. “These songs are not such 52 music.”

“These songs are beautiful music.” Dario’s mother said. “We will be 53 to play them in the evening.”

“And we won’t play so loud or late!” Dario said. He was already looking forward to 54 the new music. More than that, however, he was happy to see the big smile on his mother’s face. It gave him a feeling of 55 and made him feel that they were home at last.

36. ()

A. sat

B.stood

C.lay

D.walked

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第9题

完型填空操作提示:通过题目中的下拉选项框选择恰当的词语补全填空。Many people who work in Lo

完型填空

操作提示:通过题目中的下拉选项框选择恰当的词语补全填空。

Many people who work in London prefer to live outside it, and to go to their offices, factories or schools every day by train or by bus, even though this means they have to get up earlier in the morning and {arrive; get to; go} home later in the evening.

One benefit of living outside London is that houses are cheaper. Even a small flat in London {without; with; near} a garden costs quite a lot to rent. With the same money, one can get a little house in the {city; place; country} with a garden of his own.

Then, in the country one can be free {out of; from; without} the noise and hurry of the town. Although one has to get up earlier and spend more time in trains or bused, one can sleep better at night, and, during weekends and on summer evenings, one can enjoy the fresh clean air of the country. If one likes gardening, one can spend one's spare time digging, planting, watering and doing a lot of other jobs which are needed in the garden. Then, when the flowers and vegetables come up, one has the reward of a person who has shared the secrets of {working; nature; gardening} .

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第10题

根据下列材料请回答 46~50 题: D Long ago a kind farmer with the name of Fred lived

根据下列材料请回答 46~50 题:

D

Long ago a kind farmer with the name of Fred lived in a small old house happily together withhis gentle wife,Doris,who couldn’t see anything at the age of five.

One cold winter night,the Luck Fairy(仙女)visited them while they were eating some bread in the dim(昏暗的)light.

“Fred,you’re so kind.I'd like to give you a wish.It's my pleasure to satisfy you.”said the Luck Fairy.“A wish?”Fred and Doris asked,standing hand in hand and smiling at each other.Then Fred answered,“Thanks,Luck Fairy.We’re living a happy life.…‘We are no longer young.but we still work in the field from morning to night every day.We enjoy ourselves,”said Doris.

“You work very hard but you make SO little money.Would you like some gold coins to buy a comfortable house?”asked the Luck Fairy.“0h no,my dear Luck Fairy.We love our small old house.We have lived here for a long time,”answered Fred,without a moment’s hesitation(犹豫).“We are happy to work and live together all the time.That’s enough.”Doris agreed.

The couple(夫妇)were quite different from other people the Luck Fairy had ever met.She appreciated(欣赏)them very much.She disappeared,sayin9,“l wish you a happy life forever.”

Many years later,the couple lived happily as usual.It seemed to others that they were the happiest in the world.

Satisfaction is a kind of feeling that needs to be experienced from inside.It's very important to be satisfied with what you’ve got.If you enjoy the pleasure of the simple life。good luck will follow you.

第 46 题 What would the Luck Fairy give Fred?(1.5分)

________________________________________________

【您的答案】

【参考解析】:The Luck Fairy would give Fred a wish.

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第11题

24 MarchDear Julie,I'm sorry I haven't written for a while, but I've been busy at work and

24 March

Dear Julie,

I'm sorry I haven't written for a while, but I've been busy at work and have spent almost all my spare time looking for a flat(公寓). I saw a really nice place this morning--a third floor flat with two bedrooms. I have been tired of living in this hotel.

I met a very nice Japanese couple(夫妇) the other night and they've asked me to spend a weekend with them at their house in the country. It'll be nice to get away from Tokyo for a few days. The only problem is that they don't speak much English, and my Japanese is still very poor.

By the way, I can't remember if I thanked you for the things you sent me. Believe me, they'll be really useful when I get a flat and start doing a bit of cooking for myself.

I'm afraid I'll have to finish now. Sorry it's a short letter but I've planned to go out with some friends. I'll write again at the end of the week. Until then, take care of yourself and give my love to Tim.

Love,

John

What does John do most of the time when he is not working?

A.He goes out with friends.

B.He takes Japanese lessons.

C.He looks for a place to live in.

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