B
The fiddler crab (蟹) is a living clock. It indicates the time of day by the colour of its skin, which is dark by day and pale by night. The crab’s changing colour follows a regular twenty-four hour plan that exactly matches the daily rhythm of the sun.
Does the crab actually keep time, or does its skin simply answer to the sun’s rays, changing colour according to the amount of light which strikes it? To find out, biologists kept crabs in a dark room for two months. Even without daylight, the crab’s skin colour continued to change exactly on time.
This characteristic probably developed gradually in answer to the daily rising and setting of the sun, to help protect the crab from sunlight and enemies. After millions of years it has become completely controlled inside the living body of the crab.
The biologists noticed that once each day the colour of the fiddler crab is especially dark, and that each day this happens fifty minutes later than on the day before. From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides (潮水). The crab’s period of greatest darkening is exactly the time of low tide on the beach where it was caught!
40. The crab’s changing colour _______.
A. tells the crab what time it is
B. protects the crab from the sunlight and enemies
C. keeps the crab warm
D. is of no real use
41. When the fiddler crabs were kept in the dark, they _______.
A. did not change colour B. changed colour more quickly
C. changed colour more slowly D. changed colour on the same timetable
42. The crab’s colour—changing ability was probably developed _______.
A. in the process of evolution (进化) B. over millions of years
C. by the work of biologists D. both A and B 
43. The best title for this selection would be _______.
A. The Sun and the Tides B. Discoveries in Biology
C. A scientific Study D. A Living Clock
Everyone needs friends. We all like to feel close to someone. It is nice to have a friend to talk, laugh and do things with. Sure, there are times when we need to be alone. We don’t always want people around. But we would feel lonely if we never had a friend.
Not two people are the same. Sometimes friends don’t get along well. That doesn’t mean they no longer like each other. Most of the time, they will go on being friends. Sometimes friends move away. Then we feel very sad. We miss them very much. But we can call them and write to them. Maybe we would never see them again. And we can make new friends. It is surprising to find out how much we like new people when we get to know them. Families sometimes name their children after a close friend. Many places are named after men and women, if they are friendly to people in the town. Some libraries are named in this way. So are some schools. We think of these people when we go to these places.
There is some good news for people, if they have friends. These people live longer than those people who don’t have friends. Why? It could be that they are happier. Being happy helps you stay well, or it could be just knowing that someone cares. If someone cares about you, you take better care of yourself.
Which of the following places people name their friendly people is NOT mentioned in the
passage?
| A．A room. | B．A school. |
| C．A library. | D．A town. |
Why do people who have friends live longer?
| A．They know more about the friendship. |
| B．They take less care of themselves. |
| C．They care more about their friends. |
| D．They feel happier and healthier. |
This passage mainly tells us ________.
| A．that people need friends |
| B．that people are all friends |
| C．how to get to know friends |
| D．how to name a place |
Students who date (约会) in middle school have significantly worse study skills, are four times more likely to drop out of school and report twice as much alcohol and tobacco use than their single classmates, according to new research from the University of Georgia.
“Romantic relationships are a symbol of adolescence（青春期）, but very few studies have examined how adolescents are different in the development of these relationships.” said Pamela Orpinas, study author and professor in the College of Public Health.
Orpinas followed a group of 624 students over a seven-year period from 6th to 12th grade. Each year, the group of students completed a survey indicating whether they had dated and reported the frequency of different behaviors, including the use of drugs and alcohol. Their teachers completed questionnaires (调查表) about the students' academic efforts. He found some students never or hardly ever reported dating from middle to high school, and these students had the best study skills according to their teachers. Other students dated infrequently in middle school but increased the frequency of dating in high school.
“At all points in time, teachers rated the students who reported the lowest frequency of dating as having the best study skills and the students with the highest dating as having the worst study skills,” according to the journal article. Study skills refer to behaviors that lead to academic success such as doing work for extra credit, being well organized, finishing homework, working hard and reading assigned chapters.
“Dating a classmate may have the same emotional complications of dating a co-worker,” Orpinas said, “When the couple break up, they have to continue to see each other in class and perhaps witness the ex-partner dating someone else. It is reasonable to think this could be linked to depression and divert (转移) attention from studying.”
“Dating should not be considered a ceremony of growth in middle school.”Orpinas concluded.According to the passage, students who date in middle school may_____.
| A．have poorer academic performances |
| B．be more likely to hurt others |
| C．enjoy better school lives |
| D．are less likely to use alcohol and tobacco |
When doing his study, Orpinas _____.
| A．followed a group of students of 6th and 12th grade |
| B．found that the students' study skills have connection with their frequency of dating |
| C．completed questionnaires about the students' academic efforts |
| D．completed a survey and a report each year |
What can possibly happen to the school couples after they break up?
| A．They will miss their ex-partners sometimes. |
| B．They don't want to see each other any longer. |
| C．Their attention to studying will be affected. |
| D．They will think it's reasonable to get depressed. |
Orpinas’ attitude towards dating in middle school is _____.
| A．supportive | B．negative |
| C．indifferent | D．positive |
We don’t know how different our future will be in the future. We can only try to imagine it.
At first we think about human relationship. In the year 2050, we will use computers almost every day. We will be making new friends through the Internet----even our husbands or wives will be met in this way. It will be much faster and easier for us. On the other hand, our relationships with people won’t be as important as they are today----we will feel a little lonely.
Computers will also help us in many other activities in 2050. For example, they will be used by the children at school to make their learning easier. In addition, there will be much more other machines which will play a similar role as computers, like robots which will do the housework for us.
Spending holidays will also be completely different. Traveling to other planets or to the moon will be available for everyone. Means of transport will, of course, change, too. We will be using solar-powered cars, which will be much more environmentally friendly.
We could expect that the faster technological progress would lead to a more polluted environment. But it isn’t true. We will pay more attention to protecting the environment. And, scientists will probably find cures for many dangerous diseases, like cancer or AIDS. Therefore, our surroundings as well as our health will be in a better condition.
Although we can’t predict the exact changes which will be made in the world, we often think about them. We worry about our and our children’s future; we have expectations, hopes as well as fears. But I think we should be rather sanguine about our future. We should be happy and believe good things will happen.Why will people probably feel a little lonely in 2050?
| A．Because the number of people will become much smaller. |
| B．Because people won’t communicate with each other much often. |
| C．Because people won’t like making friends with each other. |
| D．Because there will be less face-to-face communication. |
According to the passage, which of the following will happen in 2050?
| A．It won’t be difficult for people to travel to other planets. |
| B．The way of spending holidays will be the same as that of today. |
| C．The relationship between people will be more important than today. |
| D．Our environment will be much more polluted with a growing number of cars. |
The underlined word “sanguine” in the last paragraph most probably means ______.
| A．disappointed | B．optimistic |
| C．curious | D．surprised |
What does the passage mainly talk about?
| A．How people will communicate in the year 2050. |
| B．What high technology will appear in the year 2050. |
| C．How people will travel and spend their holiday in the year 2050. |
| D．What our life will be like in the year 2050. |
Gunman Adam Lanza shot and killed 20 children in two classes of Grade One in Sandy Hook Elementary School. The only survivor(幸存者) is a six-year-old girl. She escaped by lying on the floor pretending to be killed.
After the accident , she ran out of the school building covered from head to feet with blood (血). The first thing she said to her mother was, “ Mommy, I was OK, but all my friends were dead,” Pasrtor(牧师) Jim Solomon told the ABC news’s Lara Spencer this weekend , “I thought it was impossible for her to escape from being killed without others’ help. She could behave so calmly in such a dangerous and frightening situation. She has wisdom beyond her age, for sure.”
The girl, whose name is not being written out for special reasons, was the first student to run out of the accident place at Sandy Hook, Solomon said. He said the young girl described the gunman to her mother in a way that only a young child could. “Well, she saw someone who she felt was angry, and someone who she felt was mad,” Solomon said. “Somehow, at that moment, thank God, she was able to act as if she were already dead and saved herself. And that is very unusual and admirable (令人钦佩的) for so young a girl.” she said.
There were 20 students killed on Friday in Sandy Hook Elementary School, eight boys and 12 girls. Six teachers were also killed. “Her parents told me that they couldn’t stand the feeling of a survivor’s guilt（ 负罪）, because so many of their friends no longer have their children but they have theirs.” Solomon said.
“I think you can understand their feelings as well,” he said how the girl’s mother and father were feeling about the disaster. “I don’t know whether I would have the kind of feeling that they have if the same thing happened to me.”How did the six-year-old girl escape from being killed?
| A．By fighting against the killer |
| B．By pretending to be killed |
| C．By running away quickly |
| D．By getting protection from teachers |
According to the passage, which word can best show the quality of the girl?
| A．Strong | B．Friendly |
| C．Wise | D．Curious |
From the passage, we can know that___________________.
| A．all students in Sandy Hook were killed |
| B．Solomon didn’t remember the name of the girl |
| C．eight other children escaped the accident |
| D．people didn’t know the six-year-old girl’s name |
Why did the girl’s parents feel guilty?
| A．Because they had some relationship with the gunman. |
| B．Because they didn’t tell the skills of escaping to other children. |
| C．Because their daughter survived while their friends didn’t. |
| D．Because they didn’t report the terrible accident ahead of time. |
As computers become all the more popular in China, Chinese people are increasingly depending on computer keyboards to input Chinese characters. But if they use the computer too much, they may end up forgetting the exact strokes（笔画）of each Chinese character when writing on paper. Experts suggest people, especially students, write by hand more.
Do you write by hand more or type more? In Beijing, students start using a computer as early as primary school. And computer dependence is more wide-spread among university students. Almost all their homework and essays are typed on a computer.
All the students interviewed say they usually use a computer.
It’s faster and easier to correct if using a computer. And that’s why computers are being applied more and more often to modern education. But when people are taking stock in computers increasingly, problems appear.
“When I'm writing with a pen, I find I often can't remember how to write a character, though I feel I’m familiar with it.”
“I’m not in the mood to write when faced with a pen and paper.”
Many students don't feel this is something to worry about. Now that it's more convenient and quick to write on a computer, why bother to handwrite?
Many educators think differently. Shi Liwei , the headmaster of a famous primary school in the capital said “Chinese characters enjoy both practical and aesthetic(审美的) value. But those characters typed with computer keyboards only have their practical value. All the artistic beauty of the characters is lost. And handwriting contains the writer’s emotion(情绪). Through one’s handwriting, people can get to know one's thinking and personality. Beautiful writing will give people a better first impression of them.”
To encourage students to handwrite more, many primary schools in Beijing have made writing classes compulsory(必修的)and in universities, some professors are asking students to turn in their homework and essays written by hand.The students interviewed prefer to write using a computer mainly because______.
| A．they can correct the mistakes they make quickly and conveniently |
| B．they are usually asked to e-mail their homework and essays |
| C．they find it not easy to remember how to write a character |
| D．computers have become popular in China |
Which of the following statements of the advantages of handwriting is NOT TRUE ?
| A．Chinese characters enjoy both practical and aesthetic value. |
| B．Handwriting can impress people well and build up one’s self-confidence. |
| C．Handwriting contains the writer’s emotion. |
| D．The writer’s thinking and personality are shown in his or her handwriting. |
The underlined expression “taking stock in”(Paragraph 4) probably means __________.
| A．getting bored with | B．getting curious about |
| C．becoming crazy about | D．getting dependent on |
We can infer from the passage that __________.
| A．writing by hand will give way to typing by computer one day |
| B．more and more students will give up writing on a computer |
| C．more and more students will pay attention to handwriting |
| D．the typed article better expresses one’s emotion and quality |