Even plant can run a fever, especially when they're under attack by insects or disease. But unlike human, plants can have their temperature taken from 3，000 feet away straight up. A decade ago, adopting 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, Foley's Remote Scanning Services Company could detect crop problems before they became visible to the eyes. 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-terra 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 __________.
| A．sprayed with pesticides |
| B．facing an infrared scanner |
| C．in poor physical condition |
| D．exposed to excessive sun rays |
In order to apply pesticide spraying precisely, we can use infra-red scanning to __________.
| A．estimate the damage to the crops |
| B．measure the size of the affected area |
| C．draw a color-coded map |
| D．locate the problem area |
Farmers can save a considerable amount of pesticide by __________.
| A．resorting to spot-spraying |
| B．consulting infrared scanning experts |
| C．transforming poisoned rain |
| D．detecting crop problems at an early stage |
The application of infrared scanning technology to agriculture met with some difficulties. For example，__________.
| A．the lack of official support |
| B．its high cost |
| C．the lack of financial support |
| D．its failure to help increase production |
Infrared scanning technology may be brought back into operation because of __________.
| A．the desire of farmers to improve the quality of their produce |
| B．growing concern about the excessive use of pesticides on crops |
| C．the forceful promotion by the Department of Agriculture |
| D．full support from agricultural experts |
Range
At present，there are five network firms---China Telecom，China Unicom，Jitong Communications，China Netcom and China Mobile---that are allowed to operate IP services in China．Each company has its advantages in service.
Charge
As the Ministry of Information Industry co-ordinates，the charges of IP calls of the five companies are the same，0.30 yuan per minute for DDD calls．4．80 yuan per minute for IDD calls，2.50 yuan for calls from the mainland to Hong Kong，Macao，and Taiwan，and 1.50 yuan from Shenzhen to HK，Zhongshan and Zhuhai to Macao．IP callers don’t enjoy discounts on holidays．
China Telecom has the widest coverage．All cities in China with telephone access and most countries in the world are open to China Telecom’s IP card．
China Unicom’s IP card can reach 29 cities nationwide and more than 130 countries and regions worldwide．Jitong IP can access(接通)12 cities in China and over 70 countries and regions worldwide．
China Netcom’s IP card can reach 14 cities in China and 149 countries and regions in the world.
China Mobile’s IP card is open to only six cities nationwide but can access more than 200 countries and regions worldwide.
Voice quality
China Telecom realizes its IP service by the public Intermet,therefore net congestion(拥挤)and voice delay may sometimes disturb conversations.The other four companies have their private data networks，which help to increase transmission speeds and improve voice quality.
Other services
China Telecom，Jitong and China Mobile offer account transfer services．Users can transfer the remaining sum of money on one card to another card.
Jitong and Netcom Link their services with bank cards．One can enjoy IP’s service without an IP card．Bank card users can make IP phone calls with their bank card numbers，so they needn’t buy new IP cards and remember the new numbers again and again．
As for customer service，China Telecom，China Unicom and China Mobile provide free hot line service，while Jitong and Netcom charge for their services.Which of the following is mentioned in the passage?
| A．China Unicom charges IDD calls more than the other four firms． |
| B．China Mobile’s coverage is the least of the five firms． |
| C．China Telecom accesses many more cities nationwide than the other four． |
| D．China Netcom is the only one to be allowed to operate IP service． |
If we want to access more foreign countries and regions with better voice quality，we’d better choose IP card．
| A．China Unicom’s | B．China Netcom’s | C．China Mobile’s | D．China Telecom’s |
When enjoying IP service， .
| A．Jitong users needn’t buy IP cards |
| B．China Telecom users needn’t buy new IP cards |
| C．Netcom users have to link with a bank |
| D．China Mobile users have to pay for their hot line service |
The passage mainly talks about .
| A．differences between the five IP fims |
| B．foundation of China’s five IP firms |
| C．development of China’s five IP firms |
| D．organization of the five IP firms |
It seems that some people go out of their way to get into trouble．That’s more or less what happened the night that Nashville Police officer Floyd Hyde was on duty.
“I was on the way to a personal-injury accident in West Nashville．As I got onto Highway 40，blue lights and sirens(警笛)going.I fell in behind a gold Pontiac Firebird that suddenly seemed to take off quickly down the highway．The driver somehow panicked at the sight of me．He was going more than a hundred miles an hour and began passing cars on the shoulder．”
But Hyde couldn’t go after him．Taking care of injured people is always more important than worrying about speeders，so the officer had to stay on his way to the accident．But he did try to keep the Firebird in sight as he drove，hoping another nearby unit would be able to step in and stop the speeding car．As it turned out，keeping the Firebird in sight was not that difficult．Every turn the Pontiac made was the very turn the officer needed to get to the accident scene.
Hyde followed the Pontiac all the way to his destination(目的地)．At that point he found another unit had already arrived at the accident scene．His help wasn’t needed.Now he was free to try to stop the driver of the Firebird，who by this time had developed something new to panic about．
“Just about that time，” Hyde said，“I saw fire coming out from under that car，with blue smoke and oil going everywhere.He’d blown his engine．Now he had to stop．”
“After I arrested him．I asked him why he was running．He told me he didn’t have a driver’s license(执照)．”
That accident cost the driver of the Firebird plenty---a thousand dollars for the new engine---not to mention the charges for driving without a license，attempting to run away，and dangerous driving．The underlined word“panicked”in Paragraph 2 means .
| A．feared | B．hated | C．excited | D．satisfied |
The driver of the Firebird suddenly speeded down the highway because .
| A．he was racing with another driver on the road |
| B．he realized he had to hurry to the accident scene |
| C．he thought the police officer wanted to stop him |
| D．he wanted to overtake other cars on the shoulder |
Which of the following statements is true?
| A．Someone else was taking care of the injured person． |
| B．The Pontiac reached its destination at the accident scene． |
| C．Hyde knew where he was going by following the right car． |
| D．The policeman was running after a speeder on Highway 40 |
Choose the best title for the passage．
| A．Going My Way? | B．Help on the Way? |
| C．Fun All theWay? | D．Losing His Way? |
So you have been called for an interview---well done?Your effort has been paid off? You will feeI better at the interview if you show an understanding of the nature of the organization．
Ask someone who already does it，or check it with one of the advisers．
Ask a member of your family or a friend to act as the employer and to give you an unreal interview．Be as realistic as possible，answer the questions seriously．Afterwards discuss how it went．Think about how the employer would prefer to see your look．Remember---the majority of employers are over 30.
It is not wise to rush out and buy new clothes.which will be worn for the first time at the interview．You’ll feel more at ease in a familiar dress．
Carelessness in any of these could cost you the job．Arrive at least 15 minutes before time，this will give you a chance to have a look around，read the notice board and get the feel of the place．Being late at the interview produces a bad impression．The first impression that the interviewer gets of you is formed as you walk through the door，so take a couple of deep breaths．
Be ready to shake hands if the interviewer offers．
Don’t take a seat until asked．Then sit comfortably．
Make eye contact when you are greeted and again if you shake hands．And during questioning,eye contact is a form of non-verbal greeting．
Remember the interviewer’s name and use it from time to time．
Be ready for the question “Is there anything you want to ask?” Before the interview you should get ready for two or three such questions．Look on these not just as a chance to get information but as a means to give your employer a better impression．Asking can show knowledge but avoid asking about holidays，pensions(养老金)and so on．It looks as if you are tired even before you begin．You can check on these later，when the hope for job is offered．
And if you fail, look upon the interview as an experience in itself．Learn from it．We wish you good luck and good job hunting．Before you go to see the employer，you’d better .
| A．find a dress you have got used to |
| B．buy some modern shoes，ties，etc． |
| C．have your hair cut |
| D．put on your newly-bought clothes |
What does the phrase“eye contact”means?
| A．A kind of greeting without words． |
| B．Shaking hands with the interviewer． |
| C．Looking at each other for a long time． |
| D．A way of getting a desirable job． |
People usually do the following things before a job interview．Which is the right order for doing them?
a．Asking a friend to give you an unreal interview．
b．Understanding the nature of the organization．
c．Paying attention to your clothes．
d．Arriving at the place of the interview ahead of time．
e．Getting some information from the advisers．
| A．a—e—b—c—d | B．d—c—b—a—e |
| C．b—e—a—c—d | D．e—d—a—b—c |
Why do you prepare yourself for some Is--there·-anything·-you·-want--to-say questions?
| A．To give the employer more information． |
| B．To get information about holiday and pension． |
| C．To impress the employer better and get further information from the company as well． |
| D．To show that you are the most knowledgeable． |
Many of us believe that a person’s mind becomes less active as he grows older．But this is not true，according to Dr．Lissy F．Jarvik，professor of psychiatry(精神病学)at the University of California，Los Angeles，and a board member of the New Center for Aging at the Veterans Hospital．She has studied the mental functioning of aging persons for several years.For example，one of her studies concerns 136 pairs of twins, who were first examined when they were already 60 years old．As Dr．Jarvik continued the study of the twins into their 70s and 80s，their minds did not generally decline(下降)as was expected．
However，there was some decline in their psycho-motor(精神运动的)speed． This means that it took them longer to accomplish mental tasks than it used to．But when speed was not a factor，they lost very little intellectual (智力的) ability over the years.In general，Dr．Jarvik’s studies have shown that there is no decline in knowledge or reasoning ability．This is true not only into the 30s and 40s，but into the 60s and 70s as well．
As for learning new things，and ability to remember，studies by Dr．Jarvik and others show that the old are equal to the young．It is true that older people themselves often complain that their memory is not as good as it once was．However，much of what we call“loss of memory”is not that at a11．
In the cases where the older person’s mind really seems to decline，it is not necessarilv a sign of a decay due to becoming old or“senility”．Often it is simply a sign of a depressed emotional state．This depression usually can be got rid of by counseling(咨询)with a psychologist，or medicine which fights depression.
In American society，when an older person loses something，we tend to call him or her“senile”．But notice that when a younger person loses something，he does not blame it on senility or loss of memory．He finds some other excuse!A long-term study of 136 pairs of twins showed that the only factor that declined over the years was .
| A．mental health | B．intellectual ability |
| C．the amount of knowledge | D．psycho-motor speed |
According to Dr．Jarvik’s studies，middle-aged and older persons should expect to .
| A．reason better | B．learn fewer new things |
| C．remember less | D．1ose little ability to remember |
The word“senility”most likely means .
| A．excellent health | B．weakness in body and mind because of old age |
| C．occasional forgetfulness | D．giving up one’s life |
Both younger and older persons should realize that .
| A．a sign of a decay due to old age or“senility’’is a common thing |
| B．older persons are wiser than younger ones because of different knowledge amount |
| C．senility or mental decay due to aging is much less common than most of us believe |
| D．a sign of a depressed emotional state is not a reason of decay |
More and more scientific experiments prove that physical exercise can reduce the dangers of some illnesses in middle-aged persons．Exercise strengthens the heart muscle，reduces blood pressure and help to prevent muscles from changing into fat．Physical exercise is just as important for children．
Exercise and food affect growing speed in young lab animals．Baby mice start running as soon as they are big enough to use an exercise wheel in their cage．If they get extra food and run a lot，they will grow as much as 1.5 times bigger than normal．
The same differences in growing speed might be found between active and inactive children．Physical exercise helps active children grow faster than inactive children．One experiment shows that the brains of the mice that had enough exercise weighed about 3％more than those of the mice that did not exercise The mice that exercised are much quicker to learn doing new exercise than the mice that did not exercise．
The results of the experiments suppose the theory that exercise can help babies learn to talk and walk sooner than expected．
The good effects of physical exercise are not limited to children and middle-aged people．Exercise continues to be an important part of our lives after we grow old．For example，people over 50 years old begin to lose calcium(钙) from their bones，which get weaker and can break easily．Physical exercise，however，helps to strengthen the bones and to prevent them from losing calcium．Of course，old people can take medicines to prevent themselves from suffering from losing calcium．But the medicines they take increase the chance of developing some kind of cancer(癌)．So physical exercise is a much safer treatment(治疗)．From the passage we know that .
| A．mice need to eat more and exercise more |
| B．children need more exercise than other people |
| C．old people like to take medicine to treat their illnesses |
| D．middle-aged people are easy to get fat |
Active children than inactive children．
| A．enjoy walking more |
| B．are cleverer and healthier |
| C．are stronger but more foolish |
| D．are cleverer but weaker |
Why are the bones of old people easy to break according to the passage?
| A．Because they are easy to become ill． |
| B．Because they eat less than other people． |
| C．Because they have less exercise than other people． |
| D．there is less calcium in their bones than in those of other people． |
The passage tells people that .
| A．only middle-aged persons can benefit from physical exercise |
| B．physical exercise can do good to both the middle-aged and children |
| C．people of different ages can all benefit from physical exercise |
| D．physical exercise is the safest treatment for losing calcium |
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