Science Daily (Apr 27, 2008) — Dutch ecologist Roxina Soler and her colleagues have discovered that subterranean (地下的) and aboveground herbivorous (食草的) insects can communicate with each other by using plants as telephones. Subterranean insects issue chemical warning signals through the leaves of the plant. This way, aboveground insects are warned that the plant is already “occupied”.
Aboveground, leaf-eating insects prefer plants that have not yet been occupied by subterranean root-eating insects. Subterranean insects send out chemical signals through the leaves of the plant, which warn the aboveground insects about their presence. This messaging makes it possible for spatially-separated insects to avoid each other, so that they do not compete for the same plant.
In recent years it has been discovered that different types of aboveground insects develop slowly if they feed on plants that also have subterranean residents and vice versa (反之亦然). It seems that a system has developed through natural selection, which helps the subterranean and aboveground insects to notice each other. This avoids unnecessary competition.
Through the “green telephone lines”, subterranean insects can also communicate with a third party, namely the natural enemy of caterpillars (毛虫). Parasitic wasps (寄生的黄蜂) lay their eggs inside aboveground insects. The wasps also benefit from the signals sent by the leaves, as these help them find more insects for their eggs.
The communication between subterranean and aboveground insects has only been studied in a few cases. It is still not clear how widespread this phenomenon is. But scientists are looking into it. This research was carried out at the Netherlands Institute for Ecology (NIOO-KNAW) by Roxina Soler, Jeffrey Harvey, Martijn Bezemer, Wim van der Putten and Louise Vet. The PhD project, in which this study was carried out, was funded by the Free Competition of NWO Earth and Life Sciences.
51. After finding a plant occupied by subterranean insects, aboveground insects usually ____.
A. send out warning signals B. choose to give up the plant
C. compete for the plant D. share it with the subterranean insects
52. Aboveground insects will develop more quickly if they ____.
A. feed on plants occupied by subterranean insects
B. feed on plants not occupied by subterranean insects
C. become cleverer through natural selection
D. compete with subterranean insects
53. Subterranean insects communicate with a third party through ____.
A. caterpillars B. parasitic wasps C. wasps’ eggs D. a plant’s leaves
54. What can be inferred from the last paragraph?
A. Other animals may communicate in the same way.
B. There will be further research into this phenomenon.
C. Part of the study is a PhD project.
D. The Free Completion of NWO Earth and Life Sciences has the patent for these results.
55. What would be the best title for this passage?
A. Insects use plants as a telephone. B. Insects live in harmony with each other.
C. No species can live alone. D. Plants and animals have an effect on each other.
A man once said how useless it was to put advertisements in the newspaper."Last week," he said,"my umbrella was stolen from a London church. As it was a present, I spent twice its worth in advertising, but didn't get it back."
"How did you write your advertisement?" asked one of the listeners, a merchant.
"Here it is," said the man, taking out of his pocket a slip cut from a newspaper. The other man took it and read,"Lost from the City Church last Sunday evening, a black silk umbrella.. The gentleman who finds it will receive ten shillings on leaving it at No. 10 Broad Street."
"Now," said the merchant,"I often advertise, and find that it pays me well. But the way in which an advertisement is expressed of extreme importance. Let us try for your umbrella again, and if it fails, I'll buy you a new one."
The merchant then took a slip of paper out of his pocket and wrote: "If the man who was seen to take an umbrella from the City Church last Sunday evening doesn't wish to get into trouble, he will return the umbrella to No.10 Broad Street. He is well known."
This appeared in the newspaper, and on the following morning, the man was astonished when he opened the front door. In the doorway lay at least twelve umbrellas of all sizes and colors, and his own was among them. Many of them had notes fastened to them saying that they had been taken by mistake, and begging the loser not to say anything about the matter.The result of the first advertisement was that _____.
| A．The man got his umbrella back |
| B．The man wasted some money advertising |
| C．Nobody found the missing umbrella. |
| D．The umbrella was found somewhere near the church. |
The merchant suggested that the man should ________.
| A．buy a new umbrella |
| B．go on looking for his umbrella |
| C．write another and better advertisement |
| D．report the police |
"If it fails, I'll buy you a new one," suggested that the merchant ________.
| A．was quite sure of success |
| B．wanted to buy him a new umbrella |
| C．didn't know what to do |
| D．was rich enough to buy one |
The story is mainly about _________.
| A．a useless advertisement |
| B．how to make an effective advertisement |
| C．how the man lost and found his umbrella |
| D．what the merchant did for the umbrella owner |
A farmer grew some vegetables in his garden. One day his wife was ill and he had no money. He had to sell some cabbages and carrots in the market. The next morning he took two baskets of vegetables to town. But it was raining hard that afternoon and there were few people in the street. When his vegetables were sold out, it was dark. He bought some medicine and hurried to his village.
On his way home he saw a person lying on the snow. He placed his baskets on the ground and was going to help the person to get up. At that time he found it was a dead man and there was much blood on his body. He was so afraid that he ran away quickly, without taking the baskets with him.
The next afternoon the farmer was sent to the police station. Having shown the baskets, an officer asked: “Are these yours?” “Yes, sir.” the farmer answered timidly(胆怯地)。”Have you killed the man?” “No, no, sir.” the farmer said in a hurry.” When did you see the dead man?” ”About seven last evening.” “Did you see who killed the man?” “No, Sir.” The officer brought out a knife and asked, “Have you seen it yet?” ”No, Sir.’ The officer became angry and told the policemen to beat him up and send him into prison.
That evening the officer went on trying .Pointing to the knife, he asked again,” Have you seen it yet?” ”Yes, Sir.” The officer was happy and asked,” When and where?” “I saw it here this afternoon, sir.”The farmer decided to sell the vegetables to .
| A．buy some food for his family |
| B．buy some medicine for his wife |
| C．go to see a doctor |
| D．go to the cinema |
The farmer didn’t sell out his vegetables until the evening because .
| A．they were too bad |
| B．they were very expensive |
| C．it rained hard that morning |
| D．few people liked to go out on such a bad day |
The farmer ran away quickly because .
| A．the policemen were coming towards him. |
| B．his wife was waiting for him at home |
| C．he was afraid to see a dead man. |
| D．it was so late that he couldn’t stay there any longer. |
The following are letters to the editor of a school newspaper.
Dear editor,
I’d like to express my opinion about grades. Students should be allowed to study without worrying about grades. Fortunately, most educators are becoming aware of the fact that students have different interests and abilities. I understand that grades are useful, but grades often limit creativity. Competing for better grades causes many students to turn down opportunities to pursue music, dramatics and sports. Grades force an arbitrary(武断的) standard of success on everyone. I do not demand as some extremists do, that grades be removed immediately. However, I do believe that less emphasis should be placed on grades. I hope that someday grades will become optional at Village High School.
Magdalena Smith
Drama Club
Dear editor,
I’d like to say something about grades. Let’s face the facts about grades. Grades perform three basic functions. First, grades motivate(激发) students to work at their highest level of competence（能力）. Second, they act as a reward for hardworking students and as a punishment to students who do not work hard. Finally, grades are used as an effective standard by which to measure students’ achievement. Good grades help students to get jobs and to get into university. I've spoken with a number of students who have jobs, and most of them say that they were hired primarily on the basis of their grades. My grades helped me land a part-time job and will help me get into university next year. I think grades are extremely important at Village High School.
Simon Harper
Science ClubWhich of the following is not Magdalena Smith’s opinion?
| A．Grades should not be used to measure a person’s success. |
| B．Students may give up the chance to learn music and sports for grades. |
| C．Students’ creativity may not be developed for grades. |
| D．Grades should be taken away at once. |
We can learn Simon Harper _____.
| A．is concerned about students' creativity |
| B．believes in the benefits of good grades |
| C．doesn't work too hard at his studies |
| D．supports students' interests and abilities |
From the second letter, we can infer that Simon Harper is a/an_____.
| A．student | B．teacher |
| C．headmaster | D．advertiser |
Mom’s birthday present? It may be a difficult thing for some people, but for me, it is an easy thing. Mom loved flowers, so every year I sent her flowers. Actually she had a bed of irises (鸢尾花) in the backyard of her small, Indiana farm. They were beautiful. “Take some,” she said, “Dig some up and plant them on the side of your own house.”
But in my yard they became lacking in energy. A year passed, then two, but not one flower appeared. I cut back all their green leaves. I was tired of seeing them so lonely. Finally, I dug the irises up and threw them away.
About that time Mom died unexpectedly. My sister and I sold the farm. I never went back to see the irises. I just couldn’t stand seeing another family living in our home—Mom’s home. Autumn came, then winter. The following spring, as Mom’s birthday approached, I struggled with the question of how to remember her. I stared out of the window and saw a few stubborn irises in my side yard sprouting (发芽), —tall, thin but flowerless. Because of seeing them, I decided to order flowers as I always did on Mom’s birthday, and send them to my sister. I wished so badly I could still send flowers to Mom. But that was impossible.
On the morning of Mom’s birthday, I was in my car ready to work. Something in the yard caught my eye. The irises! One had bloomed with flowers, big, showy and purple, as lovely as they ever had been on Mom’s farm. I smiled and turned my eyes upward. I could no longer send flowers to Mom. But somehow, she’d been able to send them to me.According to the first paragraph, Mom ________.
| A．didn’t like the presents from the author |
| B．wanted to give the author some flowers |
| C．lived with the author on an Indiana farm |
| D．got different birthday presents from the author every year |
At first, the irises in the author’s yard ________.
| A．all died quickly |
| B．grew as well as on Mom’s farm |
| C．didn’t bloom at all |
| D．grew better than those on Mom’s farm |
What troubled the author?
| A．She didn’t know how to grow irises. |
| B．She regretted they had sold Mom’s farm. |
| C．She couldn’t bear others living in Mom’s home. |
| D．She didn’t know what to do in memory of Mom. |
What can be learned from the last paragraph?
| A．All the irises in the author’s yard bloomed. |
| B．The author went to see the irises in Mom’s yard. |
| C．It was Mom who took care of these irises in the author’s yard. |
| D．The author thought the blooming irises were gifts from Mom. |
I am a good mother to three children. I have tried never to let my profession stand in the way of being a good parent.
I no longer consider myself the center of the universe. I show up. I listen. I try to laugh. I am a good friend to my husband. I have tried to make marriage vows (誓约) mean what they say. I am a good friend to my friends, and they to me. Without them, there would be nothing to say to you today.
So here's what I wanted to tell you today: get a life. A real life, not a desire of the next promotion (提升), the bigger paycheck, the larger house.
Get a life in which you are not alone. Find people you love，and who love you. And remember that love is not leisure(休闲) but work. Pick up the phone. Send an email. Write a letter. And realize that life is the best thing and that you have no business taking it for granted.
It is so easy to waste our lives，our days，our hours，and our minutes. It is so easy to exist instead of living. I learned to live many years ago. Something really，really bad happened to me，something that changed my life. If I had my choice，it would never have been changed at all. And what I learned from it is what，today，seems to be the hardest lesson of all.
I learned to love the journey，not the destination. I learned to look at all the good in the world and tried to give some of it back because I believed in it，completely and totally. And I tried to do that，in part，by telling others what I had learned.
By telling them this：read in the backyard with the sun on your face. Learn to be happy. And think of life as a deadly illness，because if you do，you will live with joy and passion(激情) as it ought to be lived.How did the author form her view of life?
| A．Through social experience. |
| B．By learning from her friends. |
| C．Through an unfortunate experience. |
| D． From her children and husband. |
By the underlined sentence “It is so easy to exist instead of living.” in the fifth paragraph，the author really means that people tend to________.
| A．make a living rather than live a real life |
| B．work rather than enjoy life |
| C．waste a lot in life |
| D．forget the most important lesson in life |
What’s the author’s attitude towards work?
| A．Do it well to serve others. |
| B．Earn enough money to make life better. |
| C．Try your best to get higher position and pay. |
| D．Don’t let it affect your real life. |
It can be inferred from the passage that________.
| A．the author is a success in personal life |
| B．the author doesn’t try her best to work well |
| C．the author spends all her time caring for her children |
| D．the author likes traveling very much |