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[主观题]

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.

答案

B
解析:短文第二段提到,“加州大学科学家崔东焕发现,阿根廷蚂蚁的尸体能向外释放一种化学物质告诉同伴:‘我死了,把我搬走吧。”’故选B。

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

The passage“Night of the Living Ants”tells us aboutA.how an ant is moved out of the nest a

The passage“Night of the Living Ants”tells us about

A.how an ant is moved out of the nest at night.

B.what an ant does at night.

C.how an ant finds its way in darkness.

D.what happens when an ant dies.

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第2题

The festival is a cheerful occasion because ______.A.of the lanternsB.food is laid out for

The festival is a cheerful occasion because ______.

A.of the lanterns

B.food is laid out for the dead

C.people stay up all night

D.the dead are welcomed home by the living

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第3题

Scobie’s morning discovery that he was still alive made him feel______.A.delighted with hi

Scobie’s morning discovery that he was still alive made him feel______.

A.delighted with his success in surviving the night

B.delightful because of his achievement in living

C.satisfied with his victory over life

D.satisfying with his victory over death

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第4题

Scobie's morning discovery that he was still alive made him feel ______.A.delighted with h

Scobie's morning discovery that he was still alive made him feel ______.

A.delighted with his success in surviving the night

B.delightful because of his achievement in living

C.satisfied with his victory over life

D.satisfying with his victory over death

点击查看答案

第5题

听力原文: Halloween is celebrated every year. But just how and when did this custom happen
? Is it just a harmless celebration? The word "Halloween" actually has its origins in the Catholic Church. It comes from a change of All Hallows Eve. All Hallows' Day, or All Saint's Day, November 1, is a Catholic day. But in the 5th century BC, summer officially ended on October 31. It was believed that, on that day, the spirits of all those who had died throughout the year would come back in search of living bodies for the next year. It was believed to be their only hope for the after life. Naturally, the living did not want to be taken away. So on the night of October 31, villagers would put out the fires in their homes, to make them cold and unwanted. They would then dress up in all manners of strange customs and noisily walked around the neighborhood, being as wild as possible in order to frighten away spirits looking for living bodies. Some accounts tell of how they would burn someone as sort of a lesson to the spirits.

How often is Halloween?

A.Monthly.

B.Every other year.

C.Once a year.

D.Weekly.

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第6题

听力原文:Large modern cities are too big to control. They impose their own living conditio

听力原文: Large modern cities are too big to control. They impose their own living conditions on the people who inhabit them. City-dwellers are obliged by their environment to adopt a wholly unnatural way of life. They lost touch with the land and rhythm of nature. It is possible to live such an air-conditioned existence 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 clinging to the pavement 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 at a premium. Tall buildings blot out the sun. The 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.

(33)

A.The people are not in regular communication with the rhythm of nature.

B.The people can't enjoy sunshine and fresh air.

C.Modern cities offer better schools, more chances of employment.

D.Traffic fumes pollute the air.

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第7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.

点击查看答案

第8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9题

Certainly no creature in the sea is odder than the common sea cucumber(海参). All living c

Certainly no creature in the sea is odder than the common sea cucumber(海参). All living creatures, especially human beings, have their peculiarities, but everything about the little sea cucumber seems unusual. What else can be said about an odd animal that, among other eccentricities, eats mud, feeds almost continuously day and night but can live without eating for long periods, and can be poisonous hut is considered supremely edible by gourmets(美食家) ?

For some fifty million years, despite all its eccentricities, the sea cucumber has subsisted on its diet of mud. It is adaptable enough to live attached to rocks by its tube feet, under rocks in shallow water, or on the surface of mud fiats. Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up .mud or sand and digest whatever nutrients are present.

Sea cucumbers come in a variety of colors, ranging from black to reddish-brown to sandcolor and nearly white. One form. even had vivid purple tentacles. Usually the creatures are cucumbers-shaped——hence their name——and because they are typically rock inhabitants, this shape, combined with flexibility, enables them to squeeze into narrow cracks where they are safe from predators and ocean currents.

Although they have voracious appetites, eating day and night, sea cucumbers have the capacity to become inactive and live at a low metabolic rate feeding sparingly or not at all for long periods, so that the marine organisms that provide their food have a chance to multiply. If it were not for this faculty, they would devour all the food available in a short time and would probably starve themselves out' of existence.

But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs, when attacked, it squirts all its internal organs into the water. It also casts off attached structures such as tentacles. The sea cucumber will eviscerate排除内脏) and regenerate itself if it is attacked or even touched; it will do the same if the surrounding water temperature is too high or if the water becomes too polluted.

The passage is mainly about______.

A.the reason for the sea cucumber's name

B.ways to identify the sea cucumber

C.places where the sea cucumber can be found

D.the peculiarities that make the sea cucumber unusual

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第10题

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

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. "John got married six months ago, and like many young people these days, they are struggling to make a home at a time when the cost of living is very high. The Rosses took a 2-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 shoe making 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. Most families in the country are doing everything they can to save money so they can fight the high cost of living. If you want to become a "do- it-yourself", 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 married people ______.

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11题

What are some of the steps a person can take to prevent his house from being broken into w
hile he is away.'? One step is to make sure that the house seems a lived-in one. Living room curtains should be pulled down only half-way. Bedrooms that usually have the curtains pulled down at night should be left down. Another is to make sure that all outside locks are the dead-boh type (双保险). Still another is to leave several IOOW lights burning and make sure that one is in the kitchen.

Lights that turned on and off by themselves are the best. Then, too, it is a good idea to leave the radio turned on and set to a talking station. Any type of speaking makes a thief think twice before trying to enter. Finally, while away on holiday, make sure that nothing collects in front or in the house. Particularly, make certain that the newspaper is stopped and that a trusted neighbour has been asked to pick up the mail. Thieves are especially quick to notice piled-up newspapers and overpiled mail boxes.

Why did the writer begin this piece with question?

A.Because he wanted to catch the readers' attention.

B.Because he wanted to have the readers guess the answer before reading.

C.Because he wanted to sum up (概括) the topic of the piece.

D.Because he wanted to make the readers understand him better.

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