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 colour. Although blood looks red when it's outside the body, when it's sitting in a 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, your heart or your brain?
Which works harder depends on whether you are 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 room for bigger, stronger adult teeth later on. Adult teeth fall out 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’re 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 simply lose height as their spine(脊柱) becomes shorter and more curved due to disuse and the effects of gravity. Many (but not all) men and women do lose height as they get older. Men lose an 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（旋转） 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 and balance stable. But when you suddenly stop spinning the system goes out of control, and your brain thinks you're moving 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 the 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 disease.What 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 fell 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. |
By far the most common difficulty in study is simple failure to get down to regular concentrated work. This difficulty is much greater for those who do not work to a plan and have no regular routine of study. Many students muddle along, doing a bit of this subject or that, as the mood takes them, or letting their set work pile up until the last possible moment.
Few students work to a set timetable. They say that if they did work out a timetable for themselves they would not keep to it, or would have to change it frequently, since they can never predict (foresee) from one day to the next what their activities will be.
No doubt some students take much more kindly to a regular routine than others. There are many who shy away from a self-controlled weekly timetable, and dislike being tied down to a fixed programme of work . Many able students state that they work in cycles. When they become interested in a topic they work on it attentively for three or four days at a time. On other days they avoid work completely. It has to be admitted that we do not fully understand the motivation to work. Most people over 25 years of age have become used to a work routine, and the majority of really productive workers set aside regular hours for the more important areas of their work. The “tough-minded” school of workers doesn’t fully accept the idea that good work can only be done naturally, under the influence of inspiration.
Those who believe that they need only work and study as the fit takes them have a mistaken belief either in their own talent or in the value of “freedom”. Freedom from control and discipline leads to unhappiness rather than to “self-expression” or “personality development”. Our society insists on regular habits, timekeeping and punctuality (准时), and whether we like it or not, if we mean to make our way in society, we have to meet its demands.
63．The most widespread problem in applying oneself to study is ________.
A. changing from one subject to another
B. the failure to keep to a set timetable of work
C. the unwillingness to follow a systematic plan
D. working on a subject only when one feels like it
64．Which of the following is true ?
A. Many students are not interested in using a self-controlled timetable.
B. Many students don’t like being told to study to a fixed timetable.
C. Most people over 25 years of age don’t work to a set timetable.
D. Tough-minded people agree that good work is done naturally.
65．The underlined part “as the fit takes them” in paragraph 4 means ________.
A. when they have the energy B. when they are in the mood
C. when they feel fit D. when they find conditions suitable
66．A suitable title for the passage might be ________.
A. Attitudes to Study B. A study Plan
C. The Difficulties of Studying D. Study and Self-discipline
Most people would agree that it would be wonderful if humans could regenerate (再生) limbs. Those who have lost their arms or legs would be complete again. The day is still far off when this might happen. But in the last 10 years, doctors have reported regeneration in smaller parts of the body, most often fingers.
Regeneration is not a newly-discovered process. For centuries, scientists have seen it work in some kinds of animals. Scientists now are looking for a way to turn on this exciting ability in more highly-developed animals, including humans. Their experiments show that nerves (神经), cell chemistry and the natural electric currents in the body all seem to have a part in this process.
The body of every animal contains general purpose cells that change into whatever kind of cells the body needs. These cells collect around the wound. They form a mass called a blastema (芽基). The cells of the blastema begin to change. Some became bone cells, some muscle cells, some skin cells. Slowly, a new part re-grows from the body outward. When completed, the new part is just like the old one.
More than 200 years ago, Italian scientist Luigi Spallanzani showed that younger animals have a greater ability to regenerate lost parts than older animals. So do animals lower on the ladder of evolutionary (进化的) development. The major differences seem to be that less-developed animals have more nerves in their tails and legs than humans do in their arms and legs.
Another helpful piece of information was discovered in the late 1800s. Scientists found that when a creature is injured, an electrical current flows around the wound. The strength of the current depends on how severe the wound is and on how much nerve tissue (组织) is present.
59．According to the passage, limb regeneration ________.
A. will become a reality in the near future
B. has been reported successful in some patients
C. has a long way to go before it works in humans
D. is a branch of study set up by a group of modern doctors
60．What animals are lower on the ladder of evolutionary development ?
A. More-developed animals. B. Less-developed animals.
C. Highly developed animals. D. Fully-developed animals.
61．According to Luigi Spallanzani’s discovery, ________.
A. humans have less nerves in the limbs than animals
B. some animals may not have so much nerve tissue as others
C. an injured animal regenerates masses of cells round the wound
D. electrical current can be found around the would in younger animals
62．The passage is mainly about ________.
A. a newly-discovered process B. research on animal evolution
C. a new medical discovery D. research on regeneration
TOKYO—A child-like robot that combines the roles of nurse, companion and security guard is to go on the market to help the growing ranks of elderly Japanese with no one to look after them.
The “Wakamaru” robot can walk around a house 24 hours a day, warning family, hospitals and security firms if it perceives (notices) a problem. It will, for example, call relatives if the owner fails to get out of the bath.
Cameras implanted in the “eye-brows” of the robot enable it to “see” as it walks around an apartment. The images can be sent to the latest cellphones, which display the pictures.
Mitsubishi Heavy Industries, which developed Wakamaru, plans to start selling the metre-high robots by April, 2005, for about ＄15,000 Cdn.
Wakamaru, which speaks with either the voice of a boy or girl, is also designed to provide companionship, greeting its “papa” when he comes home.
It is the first household robot able to hold simple conversations, based on a vocabulary of around 10,000 words. It cannot only speak but can understand answers and react accordingly.
It will ask “Are you all right ?” if its owner does not move for some time. If the answer is no, or there is no answer, it will telephone preset numbers, transmitting images and functioning as a speakerphone.
A. The robot can dial proper numbers for help.
B. The robot is likely to have a promising market.
C. The robot has given the Japanese a chance to live longer.
D. The nuclear families have left many elderly Japanese anxious.
58．What is the best title of this passage ?
A. The Latest Development of Robot Technology
B. Japanese Robot and the Ageing Society
C. Vast Market of the New Robot
D. Japanese-built Robot to Help the Old
It was my first day at school in London and I was half-excited and half-frightened. On my way to school I wondered what sort of questions the other boys would ask me and rehearsed (practiced) all the answers: “I am nine years old. I was born here but I haven’t lived here since I was two. I was living in Farley. It’s about thirty miles away. I came back to London two months ago.” I also wondered if it was the custom for boys to fight strangers like me, but I was tall for my age. I hoped they would decide not to risk it.
No one took any notice of me before school. I stood in the center of the playground, expecting someone to say “hello”, but no one spoke to me. When a teacher called my name and told me where my classroom was, one or two boys looked at me but that was all the curiosity my arrival aroused.
My teacher was called Mr Jones. There were 42 boys in the class, so I didn’t stand out there, either, until the first lesson of the afternoon. Mr Jones was very fond of Charles Dickens and he had decided to read aloud to us from David Copperfield, but first he asked several boys if they knew Dickens’ birthplace, but no one guessed right. A boy called Brian, the biggest in the class, said: “Timbuktu”, and Mr Jones went red in the face. Then he asked me. I said: “Portsmouth”, and everyone stared at me because Mr Jones said I was right. This didn’t make me very popular, of course.
“He thinks he’s clever,” I heard Brian say.
After that, we went out to the playground to play football. I was in Brian’s team, and he obviously had Dickens in mind because he told me to go in goal. No one ever wanted to be the goalkeeper.
“He’s big enough and useless enough,” Brian said when someone asked him why he had chosen me.
I suppose Mr Jones remembered Dickens, too, because when the game was nearly over, Brian pushed one of the players on the other team, and he gave them a penalty. As the boy kicked the ball hard along the ground to my right, I threw myself down instinctively and saved it. All my team crowded round me. My bare knees were grazed and bleeding. Brian took out a handkerchief and offered it to me.
“Do you want to join my gang (team)?” he said.
At the end of the day, I was no longer a stranger.
51．The writer prepared to answer all of the following questions EXCEPT “________”.
A. How old are you? B. where are you from?
C. Do you want to join my gang? D. When did you come back to London?
52．We can learn from the passage that ________.
A. boys were usually unfriendly to new students
B. the writer was not greeted as he expected
C. Brian praised the writer for his cleverness
D. the writer was glad to be a goalkeeper
53．The underlined part “I didn’t stand out” in paragraph 3 means that the writer was not ________.
A. noticeable B. welcome C. important D. outstanding
54．The writer was offered a handkerchief because ________.
A. he threw himself down and saved the goal B. he pushed a player on the other team
C. he was beginning to be accepted D. he was no longer a new comer
February has long been a month of romance. With the sweet smell of roses in the air, romantic films hit cinemas and love stories fill newspapers and magazines.
On the 14th day, it is a custom for a boy to take his girlfriend out to dinner, buy her flowers and chocolates, write poems, sing to her or even spell out her name with rose petals! This is what you see on Valentine’s Day, a day named after Valentine who was a priest in the third century Rome. When the emperor (皇帝) decided that single men could become better soldiers than those with wives, he didn’t allow marriage.
But Valentine continued to perform marriage ceremonies for young lovers in secret. When his actions were discovered, the emperor sentenced him to death. While in prison, it is said that Valentine fell in love with the daughter of his prison guard. Before his death, he wrote her a letter, which he signed “From your Valentine”, an expression that is still in use today. Valentine died for what he believed in and so he was made a Saint (圣徒), as well as becoming one of history’s most romantic characters.
Nowadays, Valentine’s Day is also popular among Chinese young people. Some students are planning to make Valentine’s cards for parents, teachers and friends. Others want to hold parties at which they will exchange small gifts and eat heart-shaped cakes. The idea is to have fun and encourage people to share in the spirit of St. Valentine.
72. Why did the emperor in Rome not allow marriage in his country?
A. Because there were few women in his country at that time.
B. Because he thought men without wives could be better soldiers.
C. Because there wasn’t enough food for so many people.
D. Because he wanted to control the birth rate.
73. Valentine was put into prison because _______.
A. he killed one of the soldiers B. he stole a lot of food
C. he didn’t obey the emperor’s order D. he didn’t want to be a soldier
74. The last paragraph mainly tells us _______.
A. students in China send cards to their teachers
B. it is a good idea to celebrate Valentine’s Day in China
C. it is interesting to celebrate Valentine’s Day in China
D. Valentine’s Day is also popular in China now
75. The best title for this passage should be _______.
A. Valentine’s Day B. A Brave Priest
C. Valentine’s Day in China D. A Romantic Man