Below is a selection from a popular science book.
If blood is red, why are veins（静脉） blue?
Actually, veins are not blue at all. They are more of a clear, yellowish color. Although blood looks red when it’s outside the body, when it’s sitting in the vein near the surface of the skin, it’s more of a dark reddish purple color. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison.
Which works harder, you heart or your brain?
That kind of depends on whether you’re busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But in the long run, your brain probably tips it, because even when you’re sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it.
Why do teeth fall out, and why don’t they grow back in grown-ups?
Baby (or “milk”) teeth do not last long; they fall out to make bigger room for bigger, stronger adult teeth later on. Adult teeth fall our when they become damaged, decayed and infected by bacteria. Once this second set of teeth has grown in, you’re done. When they’re gone, they are gone. This is because nature figures you’re set for life, and what controls regrowth of your teeth switches off.
Do old people shrink as they age?
Yes and no. Many people do get shorter as they age. But, when they do, it isn’t because they’re shrinking all over. They lose height as their spine（脊柱） becomes shorter and more curved due to disuse and the effect of gravity(重力). Many (but not all) men and women do lose height as they get older. Men lose and average of 3-4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again? No, because old people don’t really shrink! It is not that they are growing backwards ----- their legs, arms and backbones getting shorter. When they do get shorter, it’s because the spine has shortened a little. Or, more often, become more bent and curved.
Why does spinning make you dizzy（眩晕的）?
Because your brain gets confused between what you’re seeing and what you’re feeling. The brain senses that you’re spinning using special gravity-and-motion-sensing organs in your inner ear, which work together with your eyes to keep your vision balance stable. But when you suddenly stop spinning the system goes out of control, and your brain thinks you’removing while you’re not.
Where do feelings and emotions come from?
Mostly from an ancient part of the brain called the limbic system. All mammals have this brain area ----- from mice to dogs, cats, and humans. So all mammals feel basic emotions like fear, pain and pleasure. But since human feelings also involve other, newer bits of the brain, we feel more complex emotions than any other animal on this planet.
If exercise wears you out, how can it be good for you?
Because our bodies adapt to everything we do to them. And as far as your body is concerned, it’s “use it, or lose it”! It’s not that exercise makes you healthy, it’s more that a lack of exercise leaves your body weak and easily affected by diseaseWhat is the color of blood in a vein near the surface of the skin?
| A．Blue | B．Light yellow |
| C．Red | D．Dark reddish purple |
Why do some old people look a little shrunken as they age?
| A．Because their spine is in active use. |
| B．Because they are more easily affected by gravity. |
| C．Because they keep growing backwards. |
| D．Because their spine becomes more bent. |
Which of the following statements about our brain is true?
| A．In the long run, our brain probably works harder than our heart. |
| B．When our brain senses the spinning, we will feel dizzy. |
| C．The brains of the other mammals are as complex as those of humans. |
| D．Our feelings and emotions come from the most developed area in our brain. |
What is the main purpose of the selection?
| A．To give advice on how to stay healthy. |
| B．To provide information about our body. |
| C．To challenge new findings in medical research. |
| D．To report the latest discoveries in medical science. |
Section B
Directions: Read the following four passages. Each passage is followed by several questions or unfinished statements. For each of them there are four choices marked A, B, C and D. Choose the one that fits best according to the information given in the passage you have just read.
The professor stood before his class of 30 senior molecular (分子) biology students, about to pass out the final exam. “I have been honored to be your instructor this semester, and I know how hard you have all worked to prepare for this test,” he said to them. “I am well aware of how much pressure you are under to keep your GPAs (平均成绩) up, and because I know your are all capable of understanding this material, I am prepared to offer an automatic “B” to anyone who would prefer not to take the final.”
The relief was audible as a number of students jumped up to thank the professor and left the class. The professor looked at the handful of students who remained, and offered again, “Any other takers? This is your last opportunity.” One more student decided to go.
There were seventeen students left. The professor closed the door and took attendance. Then he handed out the final exam.
There were two sentences typed on the paper: “Congratulations, you have just received an ‘A’ in this class. Keep believing in yourself!”
I never had a professor who gave a test like that. It’s a test that any teacher in any course could and should give. Students who don’t have confidence in what they’ve learned are “B” students at best.
The same is true for students of real life. The “A” students are those who believe in what they’re doing because they’ve learned from both successes and failures. They’ve absorbed life’s lessons, whether from formal education or the school of hard knocks, and become better people.
Don’t let the biggest limit be yourself.
1. The professor offered an automatic “B” to those who would prefer not to take the final because ________.
A. he thought all of his students had prepared for the test well
B. he believed all the students were able to pass the exam
C. he didn’t want to put too much pressure on his students
D. he intended to tell the students about the importance of confidence
2. Which of the following statements is TRUE according to the passage?
A. All the students feel at easy before the exam.
B. 22 students got a “B” in the final test without doing the paper.
C. There were no problems on the test paper for the students to work out.
D. The way the professor tested the students would be unsuitable for other subjects.
3. According to the author, the test given by the professor is ________.
A. funny B. instructive C. confusing D. inappropriate
4. The point of the story is to advise readers ________.
A. to stay focused on what they can do
B. to surround themselves with confident people
C. not to put up with being second best
D. not to let themselves be the biggest obstacles to their growth
If women are mercilessly exploited year after year, they have only themselves to blame because they tremble at the thought of being seen in public in clothes that are out of fashion; they are always taken advantage of by the designers and big stores. Clothes which have been worn only a few times have to be put aside because of the change of fashion. Women usually stand in front of a wardrobe full of clothes, announcing sadly that she has nothing to wear.
Changing fashions are nothing more than the international creation of waste. Many women spend vast sums of money each year to replace clothes that have hardly been worn. Women , who cannot afford to throw away clothing in this way, waste hours of their time altering the dresses they have. Skirts are lengthened or shortened; neck-lines are lowered or raised, and so on.
No one can claim that fashion industry contributes anything really important to society. Fashion designers are rarely concerned with vital thing like warmth, comfort and durability（持久性）. They are only interested in outward appearance and they take advantage of the fact women will put up with any amount of discomfort, as long as they look right. There can hardly be a man who hasn’t at some time in his life smiled at the sight of a woman shaking in a thin dress on a winter day, or deliberately picking her way through deep snow in high-heeled shoes.
When comparing men and women in the matter of fashion, the conclusion to be drawn are obvious. Do the constantly changing fashions of women’s clothes, one wonders, reflect qualities of inconstancy and instability? Men are too clever to let themselves be cheated by fashion designers. Do their unchanging styles of dress reflect basic qualities of stability and reliability? That is for you to decide.
1. Designers and big stores always make money _______.
A. by mercilessly exploiting women workers in the clothing industry.
B. because they are capable of predicting new fashions.
C. by constantly changing the fashions in women’s clothing
D. because they attach great importance to quality in women’s clothing.
2. To the writer, the fact that women put aside their old-fashioned dresses is seen as ________.
A. a waste of money B. a waste of time
C. an expression of taste D. an expression of creativity
3. According to the passage, which of the following statements is true?
A. New fashions in clothing are created for the commercial exploitation of women.
B. The constant changes in women’s clothing reflect their strength of character.
C. the fashion industry makes an important contribution to society.
D. Fashion designs should not be encouraged since they are only welcomed by women.
4. By saying “the conclusion to be drawn are obvious”, the writer means that________.
A. women’s inconstancy in their choice of clothing is often laughed at.
B. women are better able to put up with discomfort.
C. men are also exploited greatly by fashion designers.
D. men are more reasonable in the matter of fashion.
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Section B
Directions: Read the following three passages. Each passage is followed by several questions or unfinished statements. For each of them there are four choices marked A, B, C and D. Choose the one that fits best according to the information given in the passage you have just read.
Margaret, married with two small children, has been working for the last seven years as a night cleaner, cleaning offices in a big building.
She trained as a nurse, but had to give it up when her elder child became seriously ill. “I would have liked to go back to it, but the shifts are all wrong for me, as I have to be home to get the children up and off to school.”
So she works as a cleaner instead, from 9 p.m. till 6 a.m. five nights a week for just £90, before tax and insurance. “It’s better than it was last year, but I still think that people who work ‘unsocial hours’ should get a bit extra.”
The hours she’s chosen to work mean that she sees plenty of the children, but very little of her husband. However, she doesn’t think that puts any pressure on their relationship.
Her work isn’t physically very hard, but it’s not exactly pleasant, either. “I do get angry with people who leave their offices like a place for raising pigs. If they realized people like me have to do it, perhaps they’d be a bit more careful.”
The fact that she’s working all night doesn’t worry Margaret at all. Unlike some dark buildings at night, the building where she works is fully lit, and the women work in groups of three. “Since I’ve got to be here, I try to enjoy myself—and I usually do, because of the other girls. We all have a good laugh, so the time never drags.”
Another challenge Margaret has to face is the reaction of other people when she tells them what she does for a living. “They think you’re a cleaner because you don’t know how to read and write,” said Margaret. “I used to think what my parents would say if they knew what I’d been doing, but I don’t think that way any more. I don’t dislike the work though I can’t say I’m mad about it.”
1.Margaret quit her job as a nurse because _______.
A. she wanted to earn more money to support her family
B. she had suffered a lot of mental pressure
C. she needed the right time to look after her children
D. she felt tired of taking care of patients
2.Margaret gets angry with people who work in the office because _______.
A. they never clean their offices B. they look down upon cleaners
C. they never do their work carefully D. they always make a mess in their offices
3.When at work, Margaret feels _______.
A. light-hearted because of her fellow workers B. happy because the building is fully lit
C. tired because of the heavy workload D. bored because time passed slowly
4.The underlined part in the last paragraph implies that Margaret’s parents would _______.
A. help care for her children B. regret what they had said
C. show sympathy for her D. feel disappointed in her
In 1961, scientist set up gigantic, sensitive instruments to collect radio waves from the far reaches of space, hoping to discover in them some mathematical pattern indicating that the waves were sent out by other intelligent beings. The first attempt failed, but someday the experiment may succeed.
What reason is there to think that we may actually detect intelligent life in outer space？To begin with, modern theories of the development of stars suggest that almost every star has some sort of family of planets. So any star like our own sun （and there are billions of such stars in the universe） is likely to have a planet situated at such a distance that it would receive about the same amount of radiation as the earth.
Furthermore, such a planet would probably have the same general composition as our planet; so, allowing a billion years or two or three, there would be a very good chance for life to develop, if current theories of the origin of life are correct.
But intelligent life？Life that has reached the stage of being able to send radio waves out into space in a deliberate pattern？Our own planet may have been in existence for five billion years and may have had life on it for two billion, but it is only in the last fifty years that intelligent life capable of sending radio waves into space has lived on earth. From this it might seem that even if there were no technical problems involved, the chance of receiving signals from any particular earth-type planet would be extremely small.
This does not mean that intelligent life at our level does not exist somewhere. There are such an unimaginable number of stars that, even at such miserable possibility, it seems certain that there are millions of intelligent life forms scattered through space. The only trouble is, none may be within easy distance of us. Perhaps none ever will be; perhaps the distances that separate us from our fellow “creatures” of this universe will forever remain too great to be conquered. And yet it is conceivable that someday we may come across one of them or, frighteningly, one of them may come across us. What would they be like, these outside-the-earth creatures？
1.What point is the author making by stating that almost every star has some sort of family of planets？
A. Sooner or later intelligent beings will be found on one of the stars.
B. There must be one or two of the planets on which there are no intelligent beings.
C. There are sufficient planets for there to be one that enjoys the same conditions as the earth does.
D. One or two billion years later intelligent beings will generate on those planets.
2.What is the main topic of the passage？
A. Some probable intelligent life forms on other planets.
B. Various stages undergone by the intelligent life on other planets.
C. Grounds for probable existence of intelligent life on other planets.
D. The possibility of intelligent life existing on our planet.
3.Which of the following can be inferred from the passage？
A. An encounter is probable between people from the earth and intelligent beings from another planet.
B. Though the first attempt failed, scientists did discover the radio waves sent out by other intelligent beings.
C. Other intelligent beings were able to send our radio waves into space well before the last fifty years.
D. It is certain that there are millions of intelligent beings scattered in space but only too far away.
4.According to the author, what is the difference between “we may come across one of them” and “one of them may come across us”？
A. The earth would be dangerously disadvantaged if it is sought after by possibly much more developed creatures.
B. It would prove that there are too many outside-the-earth creatures if “one of them comes across us”.
C. The history of the development of the earth would be proved to be shorter than that of “them” if “they” come across us.
D. it would prove that the distance in between is not so great as we think if “we come across one of them” someday.