Like distance runners on a measured course, all of us will move through time in a roughly predictable pattern.
In the first stage of our lives, we develop and grow, reaching toward the top of physical vitality (活力,生气).
After we grow up, however, the body begins a process of gradually wearing out.
A new awareness of physical fitness may help lengthen our years of health and vitality, yet nothing we do will work to stop the unavoidable force of aging.
Most of the changes of aging take place deep inside the body. The lungs become less able to take in oxygen. Powerful muscles gradually lose their strength. The heart loses power and pumps less blood. Bones grow easier to break.
Finally, we meet a stress, a stress that is greater than our physical resistance. Often, it is only a minor accident or chance infection (a disease caused by virus), but this time, it brings life to an end.
In 1932, a classic experiment nearly doubled the lifetime of rats, simply by cutting back the calories in their diet. The reason for the effect was then unknown.
Today, at the University of California at Berkley, Dr. Paul Seagle has also greatly lengthened the normal lifetime of rats. The result was achieved through a special protein limited diet, which had a great effect on the chemistry of the brain. Seagle showed that within the brain, specific chemicals control many of the signals that influence aging. By changing that chemical balance, the clock of aging can be reset.
For the first time, the mystery of why we age is being seriously challenged. Scientists in ma
ny fields are now making striking and far-reaching discoveries.
An average lifetime lasts 75 years, yet in each of us lies a potential for a longer life. If we could keep the vitality and resistance to disease that we have at age twenty, we would live for 800 years. What does the underlined word “it” refer to?
| A．Physical vitality. | B．Stress. | C．Aging. | D．Physical resistance. |
Which of the following is not a change of aging?
| A．The lungs become unable to take in oxygen. |
| B．People gradually lose their muscle strength. |
| C．The heart loses power and pumps less blood. |
| D．Bones tend to break more easily. |
The author believes the following except that ________.
| A．human’s life pattern is predictable |
| B．physical fitness can’t stop the force of aging |
| C．human’s lifetime will last longer than 75 years |
| D．all of the changes of aging take place deep inside the body |
How did Dr. Paul Seagle lengthen the lifetime of rats in his experiment?
| A．By limiting the protein in their diet. | B．By cutting the calories in their diet. |
| C．By resetting their clock of aging. | D．By keeping their physical fitness. |
What is probably the best title for the article?
| A．Two Great Experiments | B．The Mystery of Human Life |
| C．Ways to lengthen Human Life | D．The Breakthrough in the Study of Aging |
In a recently published book , I came across some exercises with interesting names such as fishbone diagrams , lotus flowers and clustering . As I used these exercises in my classes , I noticed that students were interested . They said more and wrote more . They enjoyed expressing their ideas and sharing them in groups .They were no longer passively waiting for the bell, but actively took part in the lesson . I find that creativity can act as a way to increase participation and improve fluency (流利程度).
Creativity has become a popular word in recent years . Scholars in the arts ,psychology (心理学), business , education , and science are all working to get a deeper understanding of it . Robert J. Sternberg is a creativity specialist and Yale professor of psychology . He defines creativity as “the ability to produce work that is both new (original )and appropriate (applicable to the situation )”. This definition is useful, as we want our students to use language in a new way , and to use it correctly and properly . Most scholars say there are two types of creativity : big “C” creativity and small “c” creativity. Big “C” creativity refers to genius level thinking that results in artistic masterpieces and scientific breakthroughs . Small “c” creativity refers to everyday level thinking that can be used in any situation . Our emphasis is on the latter . While it goes without saying that any of our students could go on to be the next Picasso or Edison , our aim is to help students produce more ideas and use language in new ways .
64．The underlined words “waiting for the bell” in the first paragraph probably mean .
A．longing for a phone call B．hoping to have a bell
C．expecting the end of the class D．wanting to speak in class
65．It can be inferred from the passage that the author thought the exercises in the book were .
A．popular B．useful C．scientific D．creative
66．When you use a very familiar word in a new way , you are .
A．creative in the sense of big “C” creativity
B．creative in the sense of small “c” creativity
C．not creative in the sense of big “c” creativity
D．not creative in the sense of small “c” creativity
67．The main purpose of the passage is to .
A．show how useful the book is B．explain what creativity is
C．discuss how one can be creative D．tell what teaching aims at
The modern age is an age of electricity. People are so used to electric lights, radio, televisions, and telephones that it is hard to imagine what life would be like without them. When there is a power failure, people grope about in flickering candlelight, cars hesitate in the streets because there are no traffic lights to guide them, and food spoils in silent refrigerators.
Yet, people began to understand how electricity works only a little more than two centuries ago. Nature has apparently been experimenting in this field for million of years. Scientists are discovering more and more that the living world may hold many interesting secrets of electricity that could benefit humanity.
All living cells send out tiny pulses of electricity. As the heart beats, it sends out pulses of record; they form an electrocardiogram, which a doctor can study to determine how well the heart is working. The brain, too, sends our brain waves of electricity, which can be recorded in an electroencephalogram. The electric currents generated by most living cells are extremely small，often so small that sensitive instruments are needed to record them. But in some animals, certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all. When large numbers of these cells are linked together, the effects can be astonishing.
The electric eel is an amazing storage battery. It can send a jolt of as much as eight hundred volts of electricity through the water in which it lives. ( An electric house current is only one hundred and twenty volts, but two hundred and twenty volts in China.) As many as four-fifths of all the cells in the electric eel's body are specialized for generating electricity, and the strength of the shock it can deliver corresponds roughly to length of its body
56. Electricity was invented ______.
A. when man had no candles
B. about 200 years ago
C. to be operating computers.
D. by Thomse Edison
57. The following things can send out pulses of electricity except______.
A. electric eels and human hearts.
B. Electrical generators and animal muscle.
C. Stones and dry wood.
D. human brain and living cells.
58. The electric current send out by an eel can be
A. as much as 800 volts. B. about one hundred and twenty volts.
C. as high as the house current in China. D. stored in the water where it lives.
59. From this shot passage we can infer _____.
A. the shorter an eel is, the stronger electricity it produces.
B. we can always feel the electricity produced by living cells.
C. human beings get their knowledge about electricity from nature.
D. people learn about electricity from eels.
Americans are proud of their variety and individuality (个性), yet they love and respect few things more than a uniform, whether it is the uniform of a lift operator or the uniform of a five-star general. Why are uniforms so popular in the United States?
Among the arguments for uniforms, one of the first is that in the eyes of most people they look more professional than civilian (百姓的) clothes. People have become conditioned to expect higher quality from a man who wears a uniform. The television repairman who wears a uniform is likely to inspire more trust than one who appears in civilian clothes. Faith in the skill of a garage mechanic is increased by a uniform. What easier way is there for a nurse, a policeman, a hairdresser, or a waiter to lose professional identity (职业身份) than to step out of uniform?
Uniforms also have many practical good points. They are often more comfortable and more lasting than civilian clothes.
Primary facts among the argument against uniforms is their lack of variety and the loss of individuality experienced by people who must wear them. Though there are many types of uniforms, the wearer of any particular type is generally stuck with it, without change, until retirement. When people look alike, they are likely to think, speak, and act similarly on the job at least.
Uniforms also give rise to some practical problems. Though they are long-lasting, often their initial expense is greater than the cost of civilian clothes. Some uniforms are also expensive to maintain, requiring professional dry cleaning rather than the home laundering possible with many types of civilian clothes.
68. What surprises us is that Americans _______.
A. still judge a man by his clothes
B. think highly of uniforms
C. less prefer wearing civilian clothes
D. respect a elevator operator in uniform
69. People are likely to think that a man in uniform ________.
A. suggests quality work B. shows his social position
C. appears to be more practical D. looks more fresh and attractive
70. Those who are against uniforms believe that people wearing uniforms ______.
A. are usually helpful B. have little freedom
C. lose personal character D. enjoy greater popularity
71. It can be concluded from the passage that ________.
A. people generally trust a person in uniform more
B. people enjoy wearing comfortable uniform
C. the cost of the uniform is acceptable to people
D. people wear uniforms to show they should be respected
Sports can help you keep fit and get in touch with nature. However, whether you are on the mountains, in the waves, or on the grassland, you should be aware that your sport of choice might have great influence on the environment.
Some sports are resource-hungry. Golf, as you may know, eats up not only large areas of countryside, but also tons of water. Besides, all sorts of chemicals and huge amounts of energy are used to keep its courses (球场) in good condition. This causes major environmental effects. For example, in the dry regions of Portugal and Spain, golf is often held responsible for serious water shortage in some local areas.
There are many environment-friendly sports. Power walking is one of them that you could take up today. You don’t need any special equipment except a good pair of shoes; and you don’t have to worry about resources and your purse. Simple and free, power walking can also keep you fit. If you walk regularly, it will be good for your heart and bones. Experts say that 20 minutes of power walking daily can make you feel less anxious, sleep well and have better weight control.
Whatever sport you take up, you can make it greener by using environment-friendly equipment and buying products made from recycled materials. But the final goal should be “green gyms”. They are better replacements for traditional health clubs and modern sports centers. Members of green gyms play sports outdoors, in the countryside or other open spaces. There is no special requirement for you to start your membership. And best of all, it’s free.
72. The author thinks the golf is resource-hungry because of the following EXCEPT that _____.
A. Golf wastes large areas of countryside B. Golf runs out of much water
C. Keeping golf court in good condition needs too much energy
D. Golf is bad for people’s health
73. According to the passage, which of the following is an environment-friendly sport?
A. swimming in the pool B. hiking in the hills
C. playing basketball in the gym D. motor racing in the desert
74. The reason why the author uses power walking as an example mainly is that ______.
A. it improves our health B. it is an outdoor sport
C. it uses fewer resources D. it is recommended by experts
75. The passage is developed mainly by _____.
A. examples and explanation B. comparison and persuasion
C. facts and descriptions D. figures and conclusion
Rising levels of carbon dioxide in the atmosphere are a major cause of climate change, and now a new study has confirmed that atmospheric CO2 is also affecting the ocean chemistry and potentially harming sea life.
Montana State University scientist Robert Dore has been researching the water in the Pacific Ocean for almost two decades.
“We’ve been going to the same spot in the Pacific Ocean, and we try and characterize long-term change in the open ocean environment. And one of the key things that we measure is CO2 levels. And we’ve been able to record this increasing quantity of atmospheric CO2 into the ocean.”
Scientists expected that as atmospheric CO2 increased, more and more of the carbon dioxide would be absorbed into the ocean, affecting the chemical balance of the sea water, with a potentially harmful impact on shellfish and coral in particular.
“As carbon dioxide dissolves (溶解) in the water, or seawater in this case, it forms a weak acid (酸), carbonic acid, ” Dore explains. “And therefore, as the concentration of CO2 in the atmosphere goes up and that exchanges with the surface seawater, it drives the pH down, and makes it more acidic.”
The seawater Dore and his colleagues have analyzed confirms what the theory predicts.
The effect was particular striking at about 250 meters down, and again at 500 meters. Dore and his colleagues came up with two possible explanations. It could be that surface water picked up CO2 and then moved to those depths. Or there could be a biological explanation.
“It’s important to realize that the oceans are really becoming acidic. And it can have negative impacts on a whole variety of sea life from fish to coral. It’s potentially catastrophic.”
68. What can be the best title of the passage?
A. Sea Life Facing Danger B. Scientist Researching Seawater
C. Oceans Becoming More Acidic D. Climate Change Affecting Seawater
69. Which of the following shows the process of the impact of atmospheric CO2 on sea life?
a. Sea life is endangered.
b. CO2 goes into the surface water.
c. The ocean chemistry is affected.
d. CO2 decreases the pH and makes the seawater more acidic.
e. CO2 levels in the atmosphere go up.
A. a→b→c→d→e B. e→b→c→d→a
C. a→e→c→d→b D. e→d→c→b→a
70. Scientist Robert Dore came to the conclusion based on ________.
A. his research and analysis B. the expectation of other scientists
C. some former theory D. a major cause of climate change
71. What does the passage want to tell us most?
A. It takes time to make a scientific study.
B. Atmospheric CO2 is doing harm to sea life.
C. Robert Dore is a committed and serious scientist.
D. Measures should be taken to prevent the potential catastrophe.