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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．

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更多“Night of the Living Ants When …”相关的问题
第1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2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3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

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第4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5题
Stratford-on-Avon, as we all know, has only one industry--William Shakespeare--but there a
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The worthy residents of Stratford doubt that the theatre adds a penny to their revenue. They frankly dislike the RSC's actors ,them with their long hair and beards and sandals and noisiness. It's all deliciously ironic when you consider that Shakespeare, who earns their living, was himself an actor(with a beard)and did his share of noise-making.

The tourist streams are not entirely separate. The sightseers who come by bus-and often take in Warwick Castle and Blenheim Palace on the side--don't usually see the plays, and some of them are even surprised to find a theatre in Stratford. However, the playgoers do manage a little sightseeing along with their playgoing. It is the playgoers, the RSC contends, who bring in much of the town's revenue because they spend the night(some of them four or five nights)pouring cash into the hotels and restaurants. The sightseers can take in everything and get out of town by nightfall..

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It would be a shame to raise prices too much because it would drive away the young people who are Stratford's most attractive clientele. They come entirely for the plays, not the sights. They all seem to look alike (though they come from all over)--lean, pointed, dedicated faces, wearing jeans and sandals, eating their buns and bedding down for the night on the flagstones outside the theatre to buy the 20 seats and 80 standing-room tickets held for the sleepers and sold to them when the box of rice opens at 10:30am.

From the first two paragraph, we learn that ______ .

A．the townsfolk deny the RSC's contribution to the town's revenue

B．the actors of the RSC imitate Shakespeare on and off stage

C．the two branches of the RSC are not on good terms

D．the townsfolk earn little from tourism

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第6题
I had visited the capital before although my friend Arthur had not, I first visited London
as a student, reluctantly released from the bosom of a tearful mum,with a traveling trunk stuffed full of home-made fruit cakes and woolly vests. I was ill-prepared for the Spartan standards of the South. Through even the grimmest post-war days, as kids we had ploughed our way through corner cuts of beef and steamed puddings. So you can imagine my dismay when I arrived, that first day, at my London digs to be faced with a plate of tuna-paste sandwiches and a thin slice of cake left curling under a tea-towel. And that was supposed to be Sunday lunch! When I eventually caught up with my extremely irritating landlady, I met with a vision of splendor more in keeping with the Royal Enclosure at the races than the area in which she lived. Festooned with jewels and furs and plastered with exclusive cosmetics, she was a walking advert for Bond Street. Now, we have a none too elegant but very apt phrase for this in the North of England, and it was the one my friend Arthur to describe London after three days there: "All fur coat and nothing underneath." Take our hotel. The reception area was plush and inviting, the lounge and dining-room pood enough to start Arthur speaking "properly". But journey upstairs from one landing to the next, at the veneers of civilization fell away before your eyes. By the time we reached our room, pretension to refinement and comfort had disappeared. The fur coat was off(back in the bands of the hire purchase company), and what we were really expected to put up with for a small fortune a night was exposed in all its shameful nakedness. It was little more than a garret, a shabby affair with patched and peeling walls. There was a stained sink with pipes that grumbled and muttered all night long and an assortment of furnishings that would have disgraced Her Majestys Prison Service. But the crowning glory was the view from the window. A peek behind the handsome facade of our fabled city. Rank gardens choked with rubbish, all the debris of life piled against the back door. It was a good job the window didnt open, because from it all arose the unmistakable odor of the abyss. Arthur, whose mum still polishes her back step and disinfects her dustbin once a week, slumped on to the bed in a sudden fit of depression. Never mind, I said, drawing the curtains. You can watch telly. This was one of the hotels luxuries, which in the newspaper ad had persuaded us we were going to spend the week in style. It turned out to be a yellowing plastic thing with a picture which rolled over and over like a floundering fish until you took your fist to it. But Arthur wasnt going to be consoled by any cheap technological gimmicks. He was sure his dad had forgotten to feed his pigeons and that his dogs were pining away for him. He grew horribly homesick. After a terrible night spent tossing and turning to a ceaseless cacophony of pipes and firedoors, traffic, drunks and low-flying aircraft, Arthur surfaced next day like a claustrophobic mole. London had got squarely on top of him. Seven million people had sat on him all night, breathed his air, generally fouled his living space, and come between him and that daily quota of privacy and peace which prevents us all from degenerating into mad axemen or reservoir poisoners. Arthur had to be got out of London for a while.

When the writer first came to the capital____.

A．he had been very reluctant to leave his mother

B．his mother had not wanted him to leave home

C．he had made no preparations for his journey south

D．he had sent his possessions on ahead in a trunk

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第7题
汉译英：后天晚上（）

A.the night after tomorrow

B.tomorrow night

C.the night after next

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第8题
I work __（）

A.in night

B.on night

C.t night

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第9题
—Good night!—____（）

A.Good morning

B.Good afternoon

C.Good night

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第10题

When the Western Hemisphere is having day, the Eastern Hemisphere is having （）.

A.both day and night

B.day

C.neither day nor night

D.night

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