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Running a fever was once thought to be the prerogative of warm-blooded creatures, whose in

ternal temperatures are independent of the weather. But, as Matthew Kluger reported in "The Importance of Being Feverish" January 1976, lizards can also develop fevers, even though there is no question that they are cold-blooded. They raise their temperatures by moving into the sun or, in the case of Kluger's experiments, under a sun lamp. And it seems to do them some good. Sick lizards kept in cages at feverish temperatures fare much better than their counterparts in normal and cool environments.

Now ,fever has spread to invertebrates(无脊椎动物). Recent studies have shown that crayfish and scorpions can develop fevers. Crayfish injected with bacteria and scorpions injected with prostaglandins (前列腺素)swam and scuttled to hot areas. Prostaglandins are hormones thought to be instrumental in the development of a fever.

Evidence is also mounting that moderate fevers have their benefits, which might explain why the fever process is so widespread. Leukocytes, white blood cells that are active in fighting bacterial infections, are more mobile at febrile temperatures. And fevers reduce the amount of iron available to bacteria. That reduction, combined with high temperatures, has been shown to inhibit bacterial growth.

Which of the following best states the main idea of the passage？

A．Cold-blooded animals can develop fevers.

B．There are benefits to developing fevers.

C．Fevers inhibit bacterial growth.

D．Lizards can develop fevers.

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更多“Running a fever was once thoug…”相关的问题

第1题

When she found her child was running a high fever, she ________ took him to hospital

A.promptly

B.prompt

C.promote

D.property

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第2题

If children have flu-like symptoms, their parents（）. A．areadvisednottogivethemas

If children have flu-like symptoms, their parents（）.

A．are advised not to give them aspirin

B．should watch out for signs of Reye syndrome

C．are encouraged to take them to hospital for vaccination

D．should prevent them from mixing with people running a fever

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第3题

If children have flu-like symptoms, their parents ______.A．are advised not to give them as

If children have flu-like symptoms, their parents ______.

A．are advised not to give them aspirin

B．should watch out for signs of Reye syndrome

C．are encouraged to take them to hospital for vaccination

D．should prevent them from mixing with people running a fever

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第4题

If children have flulike symptoms, their parents ______.A．are advised not to give them asp

If children have flulike symptoms, their parents ______.

A．are advised not to give them aspirin

B．should watch out for signs of Reye syndrome

C．are encouraged to take them to hospital for vaccination

D．should prevent them from mixing with people running a fever

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第5题

It was very fine while I got up early last Sunday morning. 【S1】______So I decided to go fo

It was very fine while I got up early last Sunday morning. 【S1】______

So I decided to go for a walk and took some photos in the 【S2】______

beautiful country. After breakfast, I carried my camera with 【S3】______

me and set off. Everything went smooth. I enjoyed my trip 【S4】______

so much that I didn't realize the weather had been turned 【S5】______

bad. I began to run and it was too late. I was caught 【S6】______

by the rain and was wet through. I kept on running until 【S7】______

I get to a bus stop. I stood there waiting a long time for the bus 【S8】______

shivering (颤抖) with cold. Shortly before I got home, I 【S9】______

had high fever, which made me stay in bed for a whole week! 【S10】______

【S1】

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第6题

Even plants can run a fever, especially when they are under attack by insects or disease.B

ut【21】______ humans, plants can have their temperature 【22】______ from 3,000 feet away— straight up. A decade ago, 【23】______ the infrared(红外线的)scanning technology developed for military purpose and other satellites, physicist Stephen Paley 【24】______ a quick way to take the temperature of crops to determine 【25】______ ones are under stress. The goal was to let farmer 【26】______ target pesticide spraying 【27】______ rain poison on a whole field, which 【28】______ include plants that don't have the pest problem.

Even better, Paley's Remote Scanning Services Company could detect crop problem before they became 【29】______ to the eye. Mounted on a plane flown at 3,000 feet 【30】______ , an infrared scanner measured the heat emitted by crops. The data were 【31】______ into a color-coded map showing 【32】______ plants were running "fevers". Farmers could then spot spray, using 50 to 70 percent less pesticide than they 【33】______ would.

The bad news is that Paley's company closed down in 1984, after only three years. Farmers 【34】______ the new technology and long-term backers were hard 【35】______ . But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to 【36】______ into operation. Agriculture experts have no doubt the technology works. "This technique can be used 【37】______ 75 percent of agricultural land in the United States," says George Oerther of Texas A&M. Ray Jackson, who recently retired from the Depart ment of Agriculture, thinks 【38】______ infrared crop scanning could be adopted by the end of the decade. But 【39】______ Paley finds the financial backing 【40】______ he failed to obtain 10 years ago.

【21】

A．as

B．with

C．like

D．unlike

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第7题

Even plants can run a fever, especially when they' re under attack by insects or disease.

But unlike humans, plants can have their temperature taken from 3,000 feet away—straight up. A decade ago, adapting the infrared(红外线) scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide(杀虫剂) spraying rather than rain poison on a whole field, which invariably includes plants that don't have pest(害虫) problems.

Even better, Paley's Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infrared scanner measured the heat emitted by crops. The data Were transformed into a color-coded map showing where plants were running "fevers". Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would.

The bad news is that Paley' s company closed down in 1984, after only three years. Farmers resisted the new technology and long-term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. "This technique can be used on 75 percent of agricultural land in the United States," says George Oerther of Texas A&M. Ray Jackson, who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if Paley finds the financial backing which he failed to obtain 10 years ago.

Plants will emit an increased amount of heat when they are in poor physical condition.

A．Right

B．Wrong

C．Not mentioned

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第8题

Even plants can run a fever, especially when they're under attack by insects or disease. B

ut unlike humans, plants can have their temperature taken from 3, 000 feet away-straight up. A decade ago, adapting the infrared scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide spraying rather than rain poison on a whole field, which invariably includes plants that don't have pest problems.

Even better, Paley's Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color-coded map showing where plants were running" fevers". Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would.

The bad news is that Paley's company closed down in 1984, after only three years. Farmers resisted the new technology and long-term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. "This technique can be used on 75 percent of agricultural land in the United States, "says George Oerther of Texas A&M. Ray Jack son ,who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if Paley finds the financial backing which he failed to obtain 10 years ago.

Plants will emit an increased amount of heat when they are ______.

A．sprayed with pesticides

B．facing an infrared scanner

C．in poor physical condition

D．exposed to excessive sun rays

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第9题

听力原文：Many people catch a cold in the spring time or fall. It makes us wonder: if scien

听力原文： Many people catch a cold in the spring time or fall. It makes us wonder: if scientists can send a man to the moon, [33] why can't they find a cure for the common cold？ The answer is easy. There're actually hundreds of kinds of cold viruses out there. You never know which one you will get, so there isn't a cure for each one. When a virus attacks your body, your body works hard to get rid of it. Blood rushes to your nose and causes a blockage in it. You feel terrible because you can't breathe well, but your body is actually eating the virus. Your temperature rises and you get a fever, but the heat of your body is killing the virus. You also have a running nose to stop the virus from getting into your cells. [34] You may feel miserable, but actually y9ur wonderful body is doing everything it can to kill the cold. Different people have different remedies for colds. In the United States and some other countries, for example, people might eat chicken soup to feel better. Some people take hot bath and drink warm liquids. Other people take medicines to relieve various symptoms of colds. There is one interesting thing to note. [35] Some scientists say taking medicines when you have a cold is actually bad for you. The virus stays in you longer, because your body doesn't develop a way to fight it and kill it.

(30)

A．They haven't devoted as much energy to medicine as to space travel.

B．There are too many kinds of cold viruses for them to identify.

C．It is not economical to find a cure for each type of cold.

D．They believe people can recover without treatment.

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第10题

Yellow Fever It is clear that to many people in the US the idea of a group of foreign musi

Yellow Fever

It is clear that to many people in the US the idea of a group of foreign musicians undertaking a concert tour of their country just now is the height of folly. Since we happened to be singing in New York City on the day American forces first entered Baghdad, it was assumed by many in the audience that we had done a very courageous thing, and we were applauded all the more for our perceived bravery. I wondered if everyone hadn't gone stark raving honkers (发疯); but, however mindless the gut reactions seem to us to he, part of what people have been telling us is true: musicians have been canceling tours, tensions have been running high against nationals of some European countries, and Americans from rural places hesitate to travel to cities like NYC for fear of terrorist attack.

I am not exaggerating. It comes as no surprise to learn that Americans will hot travel abroad at times like this; ever since Reagan bombed Libya in 1983, every arts organization that I have known has feared times of US aggression overseas, knowing that half their subscribers would not attend. But for Americans to extend that principle willy-nilly (无可奈何地) to foreigners coming to the US, and even to traveling around their own country, betrays a lack of grip which seems extreme almost to the point of caricature. A woman I was due to meet in New York cancelled the interview because although she hadn't "been in Manhattan since the war broke out, I've heard it's tense there" For her, Philadelphia was a more satisfactory place to meet because "I was just there last Monday, and the city seemed relatively peaceful."

The nastiest side of the story, as usual, is the xenophobic(恐惧外国人的) side. After giving a concert which consisted entirely of Flemish music, one of the organizers thanked me for not having chosen any German or French compositions. I asked why, and was told that it would have been much harder to sell tickets. "And Flemish is all right？" I asked. "Oh yes," he said, "no one has anything against the Flemish." "Even though," I pursued, fascinated, "Flanders is part of Belgium and the Belgians, along with the Germans and French, refused to back NATO protection for Turkey？" He did not know that Flanders was part of Belgium.

More serious was the incident of the French cello. Apparently, Yo-Yo Ma recently left his priceless cello in the back of a New York taxi and got it back as a result of a televised appeal: the taxi-driver saw the programme and turned it in. The other day a French string quartet was taking part in a festival of French music here (called "Sounds French"—the timing couldn't have been worse but the promoters went ahead anyway) and the cellist duly left his instrument in the back of a New York taxi.

The same procedure was followed as for Yo-Yo Ma, which involved giving out the mobile number of the owner. Ever since he has been inundated with hate calls. And history does not relate whether he got his cello back.

One of the reasons why we are basking in false glory at the moment is that our European colleagues have indeed taken flight and refused to tour. The highest-profile example in my world is Hesperion XXI with Jordi Savall. On the website of their agent is this announcement, under the banner "Hesperion XXI Cancels Tour because of War":

True terrorism has its hold when professionals change plans due to fear. The re-percussions [sic-remember he is a music agent] then affect all the presenters whose organizations suffer financially and the hundreds of audience members who had looked forward to the concerts. This is what has happened with Hesperion XXI when a number of its key members refused to take part in an extensive North American tour partly due to uncertainties of the war and not wanting to be apart from loved ones and the perceived terror threats in traveling around the US.

Quite apart from what the Americans deserve, these people do not deserve t

A．the majority of musicians have been infected with "yellow fever"

B．the fear of yellow fever has made many musicians dare not visit America

C．the fear of terrorists is infectious among people just like the disease yellow fever

D．Americans fear foreigners under the threat of terrorist attack

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