Labor force is defined as being the total number of people who are available to work and earn income. This definition includes everyone who is employed or seeking paid employment, so it includes employers and the self-employed. Labor is one of the country's resources which can be combined with other resources to produce the goods and services wanted by the community.
Although the size of the workforce depends a great deal on the size of the total population, there are several other influences which also affect it. The age distribution (分布) of the total population has a very marked effect on the available workforce. If the population has a high proportion of very young people or of those too old to work, then the available workforce would be lower than if there were a balanced spread age distribution. If the population naturally grows rapidly, the number of births greatly exceeds (超出) the number of deaths then as a total population increases proportion of the workforce declines.
Sometimes a po
pulation is described as aging which means that the birth rate is either falling or growing very slowly, and as people retire from the workforce there are insufficient numbers of young people entering it to replace those who are leaving it. In that situation the population is top-heavy with older people. So the percentage of the population in the workforce declines when there is either a rapid increase in births or a falling birth rate.
The age distribution of the population has several important effects on the economy. If the population is aging and there is an increase in the number of people retiring without a corresponding increase in the number entering the workforce, this raises the problem of the ability of the economy to provide a reasonable level of social services to the retired group. If the aged are to be cared for in special homes, finance must be available for that purpose. If the size of the workforce is small relative to the total population, then the government tax revenue (税收) is relatively low and either the government has less money available to it or the workforce members have to be taxed more heavily. In the passage “labor
force” is defined as ___________.
| A．people who are available to work and earn income |
| B．self-employed people only |
| C．people who are looking for an employment |
| D．employers who create job opportunities |
The conclusion which can be drawn from the second paragraph is that___________.
| A．a natural growth of population leads to a balanced workforce |
| B．a large population does not necessarily mean a higher proportion of workforce |
| C．the larger the population, the higher the proportion of the workforce |
| D．the workforce will be lower, if the population has a balanced age distribution， |
When a population is said to be aging，___________.
| A．there are more people retiring than those entering the workforce |
| B．the birth rate must be growing |
| C．there should be an oversupply of workforce |
| D．There are more people entering the workforce than those retiring |
The population which is top-heavy with older people ___________ of a country.
| A．leads to the high rate of unemployment |
| B．results in low tax on the workforce members |
| C．affects employees’ incomes |
| D．places pressure on the economy |
It is the first report that home-grown food has been contaminated by radioactivity, largely Iodine(碘)-131, since the ministry ordered radiation( powerful and harmful rays that are sent out from radioactive substances) tests on food and water at the end of March in 14 mainland regions including Beijing, Tianjin, and some coastal provinces.
Sample inspections conducted on Tuesday found low levels of radioactive iodine in spinach( a kind of green vegetables) planted in Beijing, Tianjin and Henan province --- about 1-3 becquerels per kilogram (Bq/kg), the statement said.
"The contamination level detected is too low to be harmful to public health," it said.
According to health experts, radioactive iodine can accumulate in humans once ingested in high concentrations and increases the risk of thyroid cancer. But it decays naturally within weeks.
Leafy vegetables grown in the open like spinach, lettuce and leek are among the first foods to be tainted by radioactive deposits.
Raw milk is also susceptible to radioactive contamination as livestock feed on grass.
Tests carried out in March showed spinach and milk taken from farms near Japan's nuclear-stricken area had exceeded(go beyond) government-set safety limits for radiation.
No cases of tainted water or milk have been reported in China but the ministry vowed to further strengthen monitoring.
Wang Zhongwen, a researcher at the China Institute of Atomic Energy's radiation safety department, told China Daily on Wednesday that currently China only had the means to conduct food radiation tests in a few regions.
The statement also said that recent rain in Beijing and Tianjin meant radioactive substances could have fallen on vegetables.
Chen Jicang, a vegetable dealer in Beijing, said on Wednesday that concerns are growing among consumers, businesses and governments across the world.
"We have yet to see any impact on our business from the radiation, but we will keep a close eye on how the issue develops," he said.
He added that most vegetables consumed in Beijing are produced locally, and he might switch to other varieties if spinach sales suffer.
Yang Guoshan, a researcher of radiation medical science at the Academy of Military Medical Sciences, said people could safely eat products that contain low levels of Iodine-131.
"The radiation level is so low that residents don't need to spend any extra effort on cleaning them," he said.
Gao Jie, a 52-year-old resident in Tianjin said she is deeply worried because spinach is a staple part of her family's diet.
"If spinach is radioactive, is there any possibility that other types of vegetables are safe?"
Trace levels of radioactive isotope cesium-137 and -134 were detected in the air in 21 provinces and regions on Wednesday, up from 17 on Tuesday, according to China's National Nuclear Emergency Coordination Committee. What does the underlined word mean in para 1?
| A．protected | B．contained | C．polluted by dangerous substances | D．tested |
Why are the spinach and milk taken from nuclear-stricken area not safe?
| A．Because tests have been carried out there. |
| B．Raw milk is sensitive to radioactive contamination as livestock（家畜）feed on grass. |
| C．The amount of radioactive substances goes beyond the safe limits for radiation. |
| D．Japan is a nuclear-stricken area. |
Where do you think this passage comes from?
| A．a magazine | B．CCTV news | C．a journal | D．a novel |
What is not mentioned in the passage?
| A．Consumers became concerned about the safety of vegetables. |
| B．People need to clean vegetables completely before cooking because of radiation. |
| C．Food and water have to be tested since the end of March in 14 mainland regions |
| D．Low levels of radioactive iodine has been found in spinach in Tianjin |
What do you think is mainly talked about in the passage?
| A．How the radioactivity came into being |
| B．What we should do in face of radioactivity. |
| C．Radioactivity has no side effect on human being. |
| D．Home-grown food has been affected by radioactivity. |
When it comes to friends, I desire those who will share my happiness, who possess wings of their own and who will fly with me. I seek friends whose qualities illuminate（light）me and train me up for love. It is for these people that I reserve the glowing hours, too good not to share.
When I was in the eighth grade, I had a friend. We were shy and “too serious” about our studies when it was becoming fashionable with our classmates to learn acceptable social behaviors. We said little at school, but she would come to my house and we would sit down with pencils and paper, and one of us would say:“Let’s start with a train whistle today.” We would sit quietly together and write separate poems or stories that grew out of a train whistle. Then we would read them aloud. At the end of that school year, we, too, were changing into social creatures and the stories and poems stopped.
When I lived for a time in London, I had a friend, He was in despair(disappointment)and I was in despair. But our friendship was based on the idea in each of us that we would be sorry later if we did not explore this great city because we had felt bad at the time. We met every Sunday for five weeks and found many excellent things. We walked until our despairs disappeared and then we parted. We gave London to each other.
For almost four years I have had remarkable friend whose imagination illuminates mine. We write long letters in which we often discover our strangest selves. Each of us appears, sometimes in a funny way, in the other’s dreams. She and I agree that, at certain times, we seem to be parts of the same mind. In my most interesting moments, I often think:“Yes, I must tell….”We have never met.
It is such comforting companions I wish to keep. One bright hour with their kind is worth more to me than the lifetime services of a psychologist，who will only fill up the healing silence necessary to those darkest moments in which I would rather be my own best friend. In the eighth grade, what the author did before developing proper social behavior was to ______.
| A．become serious about her study | B．go to her friend’s house regularly |
| C．learn from her classmates at school | D．share poems and stories with her friend |
In Paragraph 3, “We gave London to each other” probably means ______.
| A．our exploration of London was a memorable gift to both of us |
| B．we were unwilling to tear ourselves away from London |
| C．our unpleasant feeling about London disappeared |
| D．we parted with each other in London |
According to Paragraph 4, the author and her friend _______.
| A．call each other regularly | B．have similar personalities |
| C．enjoy writing to each other | D．dream of meeting each other |
In the darkest moments, the author would prefer to ______.
| A．seek professional help | B．be left alone |
| C．stay with her best friend | D．break the silence |
What is the best title for the passage?
| A．Unforgettable Experiences | B．Remarkable Imagination |
| C．Lifelong Friendship | D．Noble Companions |
Forget Twitter and Facebook, Google and the Kindle. Television is still the most influential medium around. Indeed ,for many of the poorest regions of the world, it remains the next big thing——finally becomes globally available. And that is a good thing, because the TV revolution is changing lives for the better.
Across the developing world, around 45% of families had a TV in 1995; by 2005 the number had climbed above 60%. That is some way behind the U.S. , where are more TVs than people, and where people now easily get access to the Internet. Five million more families in sub-Saharan Africa will get a TV over the next five years. In 2005 , after the fall of the Taliban（塔利班）,which had outlawed TV, 1 in 5 Afghans had one. The global total is another 150 million by 2013——pushing the numbers to well beyond two thirds of families.
Television’s most powerful effect will be on the lives of women. In India, researchers Robert Jensen and Emily Oster found that when TVs reached villages, women were more likely to go to the market without their husbands’ approval and less likely to want a boy rather than a girl. They were more likely to make decisions over child health care. TV is also a powerful medium for adult education. In the Indian state of Gujarat, Chitrageet is a popular show that plays Bollywood songs with words in Gujarati on the screen. Within six months, viewers had made a small but significant improvement in their reading skills.
Too much TV has been associated with violence, overweight and loneliness. However, TV is having a positive influence on the lives of billions worldwide. The underlined word “outlawed” in paragraph 2 probably means “”.
| A．allowed | B．forbidden | C．offered | D．refused |
Which of the following is TRUE according to the passage?
| A．Americans used to get access to the Internet easily. |
| B．The world’s TV sets will total 150 million by 2013. |
| C．45% of families in the developing countries had a TV in 2005. |
| D．Over two thirds of families in the world will have a TV by 2013. |
The author intends to .
| A．stress the advantages of TV to people’s lives |
| B．persuade women to become more independent |
| C．encourage people to improve their reading skills |
| D．introduce the readers some websites such as Google |
What would be the best title for the passage?
| A．TV Will Rule the World | B．TV Will Disturb the World |
| C．TV Will Better the World | D．TV Will Remain in World |
From the passage, we know _______________.
| A．It is impossible for women in India to get access to TVs now. |
| B．Robert Jensen and Emily Oster are Indian women. |
| C．Women in India are more likely to want a girl than a boy because of the arrival of TV. |
| D．Viewers of a popular TV show can improve their reading skills greatly in half a year. |
The elephant was lying heavily on its side, fast asleep. A few dogs started barking at it. The elephant woke up in a terrible anger: it chased the dogs into the village where they ran for safety.That didn't stop the elephant. It destroyed a dozen houses and injured several people. The villagers were scared and angry. Then someone suggested calling Parbati, the elephant princess.
Parbati Barua's father was a hunter of tigers and an elephant tamer. He taught Parbati to ride an elephant before she could even walk. He also taught her the dangerous art of the elephant round-up -- how to catch wild elephants.
Parbati hasn't always lived in the jungle. After a happy childhood hunting with her father, she was sent to boarding school in the city. But Parbati never got used to being there and many years later she went back to her old life. "Life in the city is too dull. Catching elephants is an adventure and the excitement lasts for days after the chase," she says.
But Parbati doesn't catch elephants just for fun. "My work," she says, "is to rescue man from the elephants, and to keep the elephants safe from man." And this is exactly what Parbati has been doing for many years. Increasingly, the Indian elephant is angry: for many years, illegal hunters have attacked it and its home in the jungle has been reduced to small pieces of land. It is now fighting back. Whenever wild elephants enter a tea garden or a village, Parbati is called to guide the animals back to the jungle before they can kill.
The work of an elephant tamer also involves love and devotion. A good elephant tamer will spend hours a day singing love songs to a newly captured elephant. "Eventually they grow to love their tamers and never forget them. They are also more loyal than humans," she said, as she climbed up one of her elephants and sat on the giant, happy animal. An elephant princess indeed! For Parbati, catching elephants is mainly to.
| A．get long lasting excitement | B．keep both man and elephants safe |
| C．send them back to the jungle | D．make the angry elephants tame |
Before Parbati studied in a boarding school,.
| A．she spent her time hunting with her father |
| B．she learned how to sing love songs |
| C．she had already been called an elephant princess |
| D．she was taught how to hunt tigers |
Indian elephants are getting increasingly angry and they revenge because.
| A．they are caught and sent for heavy work |
| B．illegal hunters capture them and kill them |
| C．they are attacked and their land gets limited |
| D．dogs often bark at them and chase them |
The passage starts with an elephant story in order to explain that in India .
| A．people easily fall victim to elephants' attacks |
| B．the man-elephant relationship is getting worse |
| C．elephant tamers are in short supply |
| D．dogs are as powerful as elephants |
Which of the following is not mentioned in the passage?
| A．Both Parbati and his father are elephant tamers |
| B．Parbati spent much time living in the jungle to be an elephant tamer. |
| C．Devotion makes a great difference to an elephant tamer. |
| D．Parbati’s work is to rescue both elephants and man. |
Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.
“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”
Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro/nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.
“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”
His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.
“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”
Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair. Which of the following is true of Jae Kwon?
| A．He teaches chemistry at MU. |
| B．He developed a chemical battery. |
| C．He is working on a nuclear energy source. |
| D．He made a breakthrough in computer engineering. |
Jae Kwon gave examples in Paragraph 4_________.
| A．to show chemical batteries are widely applied. |
| B．to introduce nuclear batteries can be safely used. |
| C．to describe a nuclear-powered system. |
| D．to introduce various energy sources. |
Liquid semiconductor is used to _________.
| A．get rid of the radioactive waste |
| B．test the power of nuclear batteries. |
| C．decrease the size of nuclear batteries |
| D．reduce the damage to lattice structure. |
According to Jae Kwon, his nuclear battery _______.
| A．uses a solid semiconductor | B．will soon replace the present ones. |
| C．could be extremely thin | D．has passed the final test. |
The text is most probably a ________.
| A．science news report | B．book review |
| C．newspaper ad | D．science fiction story |