You could fill a store with all the energy drinks available. They promise to make people feel more energetic and think more clearly. These products have names like Red Bull, Monster, Ripped Force, Speed Stack and 5-Hour Energy. They appeal mainly to young people.
Professor Chad Reissig, at Johns Hopkins University in Baltimore, is a medical researcher who studies drug dependence. He says the team he works on got interested in studying energy drinks.
He says the researchers have found three things. One: there are hundreds of brands of energy drinks in most major countries. Two: the drinks are not clearly labeled with enough information. And three: the amount of caffeine differs greatly. Some contain as little as fifty milligrams, while others as much as five hundred.
Some people combine energy drinks with alcohol. They think they can drink more alcohol that way and not be affected. Studies, however, suggest that they are still under the influence of the alcohol even if they do not feel that way.
Some makers of energy drinks do provide warnings. For example, a popular energy drink warns against use by people who are under the age of twelve. The directions also advise people to limit caffeine products and to drink only half the bottle.
The team at Johns Hopkins University published a report in the journal Drug and Alcohol Dependence. They suggested that the amount of caffeine and other ingredients be clearly listed on the drink. The researchers are continuing to study energy drinks. They are seeking young people who have had a bad experience after drinking them.
50. According to the passage, the energy drinks mainly attract____.
A. young people B. alcohol drinkers
C. university professors D. twelve-year-old children
51. The team thinks that the biggest problem of the energy drinks is that .
A. there are too many brands B. they are not clearly labeled
C. there is too much caffeine D. they are not available in some stores
52. The purpose of the passage is to tell readers .
A. to identify caffeine in energy drinks
B. to take a closer look at energy drinks
C. whether energy drinks are good or bad
D. whether energy drinks make people addicted
The Development of Cities
Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It catalyzed physical expansion, it sorted out people and land uses, and it accelerated the inherent instability of urban life. By opening vast areas of unoccupied land for residential expansion, the omnibuses, horse railways, commuter trains, and electric trolleys pulled settled regions outward two to four times more distant form city centers than they were in the premodern（现代文明之前）era. In 1850, for example, the borders of Boston lay scarcely two miles from the old business district; by the turn of the century the radius extended ten miles. Now those who could afford it could live far removed from the old city center and still commute there for work, shopping, and entertainment. The new accessibility of land around the periphery of almost every major city sparked an explosion of real estate development and fueled what we now know as urban sprawl. Between 1890 and 1920, for example, some 250,000 new residential lots were recorded within the borders of Chicago, most of them located in outlying areas. Over the same period, another 550,000 were plotted outside the city limits but within the metropolitan area. Anxious to take advantage of the possibilities of commuting, real estate developers added 800,000 potential building sites to the Chicago region in just thirty years – lots that could have housed five to six million people.
Of course, many were never occupied; there was always a huge surplus of subdivided, but vacant, land around Chicago and other cities. These excesses underscore a feature of residential expansion related to the growth of mass transportation: urban sprawl was essentially unplanned. It was carried out by thousands of small investors who paid little heed to coordinated land use or to future land users. Those who purchased and prepared land for residential purposes, particularly land near or outside city borders where transit lines and middle-class inhabitants were anticipated, did so to create demand as much as to respond to it. Chicago is a prime example of this process. Real estate（财产）subdivision（细分再分的部分）there proceeded much faster than population growth.With which of the following subjects is the passage mainly concerned?
A Types of mass transportation.
B Instability of urban life.
C How supply and demand determine land use.
D The effect of mass transportation on urban expansion.Why does the author mention both Boston and Chicago?
A To demonstrate positive and negative effects of growth.
B To exemplify cities with and without mass transportation.
C To show mass transportation changed many cities.
D To contrast their rate of growth.According to the passage, what was one disadvantage of residential expansion?
A It was expensive.
B It happened too slowly.
C It was unplanned.
D It created a demand for public transportation.The author mentions Chicago in the second paragraph as an example of a city,
A that is large.
B that is used as a model for land development.
C where the development of land exceeded population growth.
D with an excellent mass transportation system.
Stricter Traffic Law Can Prevent Accidents
From the health point of view we are living in a marvelous（不平凡的）age. We are immunized from birth against many of the most dangerous diseases. A large number of once fatal illnesses can now be cured by modern drugs and surgery. It is almost certain that one day remedies will be found for the most stubborn remaining diseases. The expectation of life has increased enormously. But though the possibility of living a long and happy life is greater than ever before, every day we witness the incredible slaughter of men, women and children on the roads. Man versus the motor-car ! It is a never-ending battle which man is losing. Thousands of people the world over are killed or horribly killed each year and we are quietly sitting back and letting it happen.
It has been rightly said that when a man is sitting behind a steering wheel, his car becomes the extension of his personality. There is no doubt that the motor-car often brings out a man’s very worst qualities. People who are normally quiet and pleasant may become unrecognizable when they are behind a steering-wheel. They swear, they are ill-mannered and aggressive, willful as two-years-olds and utterly selfish. All their hidden frustrations, disappointments and jealousies seem to be brought to the surface by the act of driving.
The surprising thing is that society smiles so benignly on the motorist and seems to condone his behaviour. Everything is done for his convenience. Cities are allowed to become almost uninhabitable because of heavy tragic; towns are made ugly by huge car parks; the countryside is desecrated by road networks; and the mass annual slaughter becomes nothing more than a statistic, to be conveniently forgotten.
It is high time a world code were created to reduce this senseless waste of human life. With regard to driving, the laws of some countries are notoriously lax and even the strictest are not strict enough. A code which was universally accepted could only have a dramatically beneficial effect on the accident rate. Here are a few examples of some the things that might be done. The driving test should be standardized and made far more difficult than it is; all the drivers should be made to take a test every three years or so; the age at which young people are allowed to drive any vehicle should be raised to at least 21; all vehicles should be put through stringent annual tests for safety. Even the smallest amount of alcohol in the blood can impair a person’s driving ability. Present drinking and driving laws (where they exist) should be mad much stricter. Maximum and minimum speed limits should be imposed on all roads. Governments should lay down safety specifications for manufacturers, as has been done in the USA. All advertising stressing power and performance should be banned. These measures may sound inordinately harsh. But surely nothing should be considered as to severe if tit results in reducing the annual toll of human life. After all, the world is for human beings, not motor-cars.The main idea of this passage is
A Traffic accidents are mainly caused by motorists.
B Thousands of people the world over are killed each year.
C The laws of some countries about driving are too lax.
D Only stricter traffic laws can prevent accidents.What does the author think of society toward motorists?
A Society smiles on the motorists. B Huge car parks are built in the cities and towns.
C Victims of accidents are nothing. D Society condones their rude driving.Why does the author say:’ his car becomes the extension of his personality?’
A Driving can show his real self. B Driving can show the other part of his personality.
C Driving can bring out his character. D His car embodies his temper.Which of the followings is NOT mentioned as a way against traffic accidents?
A Build more highways. B Stricter driving tests.
C Test drivers every three years. D raise age limit and lay down safety specifications.The attitude of the author is
A ironical B critical C appealing D militant
While students in Hainan are quite used to clear skies, Beijing teenagers are not so lucky. As another warm winter approaches, the city can expect the normal clouds of smoke caused by air pollution.
But things could start to get better soon. The government is co-operating with a US-based environmental protection agency to update existing buses and trucks with clean fuel technology. The new technology could reduce air pollutants in existing diesel vehicles (柴油机) by 40 per cent. The programme will begin by testing buses in Beijing to see if the technology can be applied to them.
“We encourage the development of public transportation. But at the same time we need to reduce pollution from them,” said an official.
Efforts are being made to improve the capital’s environment with tighter controls on emissions (排放). Some heavily polluting factories and construction sites, such as those owned by the steel giant Shougang Group, have been asked to cut production in November and December or be closed.
Beijing was the third polluted city in the world at the end of last century, according to the UN. But thanks to recent measures, the capital has made some progress. Last year 224 clear days were rated as having good air quality. In 1998 the air quality index (指数) gave just 100 days as good.
“I am glad to see an improvement,” said a Senior 1 boy living in the northwest of Beijing. “Compared to other places, the air quality of Beijing is still worrying though. I hate the pollution. Once I was riding my bike in the morning when I almost had a traffic accident because I couldn’t see a car only metres away from me in frog.”
In early October, the skies were covered by such a thick fog that a display show by the visiting French air force was called off.
Rapid development, industry, traffic fumes (烟) and sandstorms from the desert all contribute to the city’s bad air.The passage is mainly about ________?
| A．a programme to improve Beijing’s air quality |
| B．progress made in Beijing’s air quality |
| C．Beijing’s air pollution |
| D．the difference between Hainan and Beijing |
Which of the following is not the measure taken or to be taken to improve Beijing’s air?
| A．Clean fuel technology will be used in public transportation. |
| B．Some factories have been asked to cut production. |
| C．Some construction sites have been told to be closed. |
| D．A display show of airplanes has been called off. |
We can infer from the passage that, with the aim of being an ecological (生态的) city by the 2008 Olympics, ________.
| A．far more still needs to be done |
| B．nothing else needs to be done |
| C．all traffic has to be closed |
| D．the development of the city has to be slowed down |
Which is not correct according to the passage?
| A．Beijing’s air quality is getting worse and worse. |
| B．Development, industry, traffic fumes and sandstorms are all the causes of bad air quality. |
| C．Clouds of smoke in the sky is the common feature in the winter of Beijing. |
| D．The government is making every effort to stop air pollution. |
How men first learned to invent words is unknown, in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs, called letters, which could be combined to represent those sounds and which could be written down. Those sounds, whether spoken, or written in letters, we call words.
The power of words, then, lies in their association—the thing they bring up before our minds. Words become filled with meaning for us by experience; and the longer we live, the more certain words recall to us the glad and the sad events of our past; and the more we read and learn, the more the number of words that mean something to us increase.
Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions. This charming and telling use of words is what we call literary style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which by their position and association can move men to tears. We should, therefore, learn to choose our words carefully and use them accurately, or they make our speech silly and vulgar. What is the origin of language?
| A．It is unknown. |
| B．It is a matter that is unclear. |
| C．It is a question difficult to answer. |
| D．It is a problem not yet solved. |
Which of the following about a real poet is NOT true?
| A．He is less than a master of words. |
| B．His style is always charming. |
| C．His poem can move men to tears. |
| D．He can express his ideas in words that sing like music. |
Where does the real power of the words come from?
| A．From the words themselves. |
| B．From their characteristics. |
| C．From their peculiarity. |
| D．From their association. |
What is the main idea of the passage?
| A．The importance of choosing words. |
| B．Where the real power of words come from. |
| C．What great writers are like. |
| D．We should learn to choose words carefully. |
George Washington Carver showed that plant life was more than just food for animals and humans. Carver’s first step was to analyze plant parts to find out what they were made of. He then combined these simpler isolated substances with other substances to create new products.
The branch of chemistry that studies and finds ways to use raw materials from farm products to make industrial products is called chemurgy. Carver was one of the first and greatest chemurgists of all time. Today the science of chemurgy is better known as the science of synthetics(合成纤维织物). Each day people depend on and use synthetics made from raw materials. All his life Carver battled against the disposal of waste materials, and warned of the growing need to develop substitutes(代用品) for the natural substances being used up by humans.
Carver never cared about getting credit for the new products he created. He never tried to patent(申请专利) his discoveries or get wealthy from them. He turned down many offers to leave Tuskegee Institute to become a scientist in private industry. Thomas Edison, inventor of the electric light, offered him a laboratory in Detroit to carry out food research. When the United States government made him a collaborator in the Mycology and Plant Disease Survey of the Department of Agriculture, he accepted the position with the understanding that he wouldn’t leave Tuskegee. An authority on plant disease—especially of the fungus(真菌) variety—Carver sent hundreds of specimens(标本) to the United States Department of Agriculture. At the peak of his career, Carver’s fame and influence were known on every continent. What does the passage mainly tell us?
| A．It mainly tells us about Gorge Washington Carver, a great chemurgist. |
| B．It mainly tells us about chemurgy. |
| C．It mainly tells us about the research made in Tuskegee. |
| D．It mainly tells us about the development of making synthetics. |
The underlined word “disposal” in the second paragraph mean “________”.
| A．control | B．throwing away |
| C．management | D．keeping |
Which of the following is NOT mentioned in the passage?
| A．Make a study of plant parts. |
| B．Make new products out of farm products. |
| C．Carver helped the United States Department of Agriculture. |
| D．Make a study on animal disease. |
Which of the following is NOT true according to the passage?
| A．Carver never patented what he discovered. |
| B．Carver refused many offers to work in private companies. |
| C．Carver made little money out of his discoveries. |
| D．Carver helped Edison invent electric light. |
粤公网安备 44130202000953号