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.
Mr. Jackson was tired of living in his old house in the countryside and wanted to sell it and buy a better one. He tried to sell it for a long time, but was not successful, so at last he decided to go to an estate agent.
The agent advertised(登广告) the house straight away, and a few days later, the owner saw a very beautiful photograph of his house, with a wonderful description of his garden in an expensive magazine.
Having read the advertisement through, the house owner hurried to phone the estate agent, saying, “I'm sorry, Mr. Jones, but I've decided not to sell my house after all.” “Why?” the agent asked in a surprised voice. “Because from the advertisement in that magazine I can see it's just the kind of house I've wanted to live in all my life.” Mr. Jackson wanted to sell his house because _____.
| A．he needed some money to support his family |
| B．his house was too old to live in |
| C．he wanted some money to buy a new one |
| D．he didn't want to live in the house any longer |
The reason why Mr. Jackson went to the estate agent was _____.
| A．he had failed in selling his house by himself |
| B．he wanted the estate agent to help him to get a good price |
| C．he was sure that the estate agent could help him |
| D．he wanted the estate to advertise his house in the magazine |
At last Mr. Jones _____.
| A．was successful in selling the house |
| B．felt sorry to have lost a sale by his doing too good a job |
| C．was satisfied with what he had done in the advertisement |
| D．didn’t understand why Mr. Jackson had changed his mind |
What do you think of the advertisement in magazines?
| A．They are worth reading. |
| B．They usually make things far better than they really are. |
| C．They are a great help to those who want to buy something. |
| D．They describe things as they really are. |
What’s the meaning of “an estate agent” in paragraph one?
| A．a person who has a house to sell |
| B．a person who helps others to advertise houses in magazines |
| C．a person whose work is to sell houses for others |
| D．a person who likes beautiful houses |
My house is made out of wood, glass and stone. It is also made out of software.
If you come to visit, you’ll probably be surprised when you come in. Someone will give you an electronic PIN （个人身份号码）to wear. This PIN tells the house who and where you are. The house uses this information to give you what you need. When it’s dark outside, the PIN turns on the lights nearest you, and then turns them off as you walk away from them. Music moves with you too. If the house knows your favorite music, it plays it. The music seems to be everywhere, but in fact other people in the house hear different music or no music. If you get a telephone call, only the nearest telephone rings.
Of course, you are also able to tell the house if you want something. There is a home control console (控制台), a small machine that turns things on and off around you.
The PIN and the console are new ideas, but they are in fact like many things we have today. If you want to go to a movie, you need a ticket. If I give you my car keys, you can use my car. The car works for you because you have the keys. My house works for you because you wear the PIN or hold the console.
I believe that ten years from now, most new homes will have the systems that I’ve put in my house. The systems will probably be even bigger and better than the ones I’ve put in today.
I like to try new ideas. I know that some of my ideas will work better than others. But I hope that one day I will stop thinking of these systems as new, and ask myself instead, “How will I live without them?” What does the passage mainly discuss?
| A．How to develop a new system. | B．The function of the PIN. |
| C．A home for the future. | D．Easy life in the future. |
What’s the purpose when the writer wrote the fourth paragraph?
| A．To let readers know why his ideas are new. |
| B．To let readers know how special his house is. |
| C．To explain the importance of the PIN and the console. |
| D．To explain more easily what the functions of the PIN and the console are. |
The writer’s new house is different from ordinary ones mainly because _____.
| A．it has been controlled by computers |
| B．you can make a telephone call anywhere |
| C．it has your favorite music following you |
| D．the writer is able to change his new idea into practice |
What is the writer most likely to be according to the passage?
| A．An IT expert. | B．A famous doctor. |
| C．An idealist | D．An experienced teacher. |
What can’t be done in the writer’s new house?
| A．turns on the lights | B．play music |
| C．get a telephone call | D．go swimming |
We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons most of them move to find food more easily, but others move to get away from places that are too crowded. When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration（迁移）is probably the migration of the fish, which is called “salmon”. This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mice. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.
Recently, scientists have studied the migration of a kind of lobsters（龙虾）. Every year, when the season of bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go. So, sometimes we know why humans and animals move from one place to another, but at other times we don’t. Maybe living things just like to travel.Most animals move from one place to another at a certain time to __________ .
| A．give birth | B．enjoy warmer weather |
| C．find food more easily | D．find beautiful places |
The fish called “salmon” spends a long life in __________ .
| A．salt water | B．rivers | C．fresh water | D．its birthplace |
The mice in northern Europe move when __________ .
| A．they give birth | B．the weather is bad |
| C．the place gets too crowded | D．they haven’t enough food |
The lobsters move __________ .
| A．to the fresh water | B．to the sea floor |
| C．at a certain time | D．to find more food |
What is the main idea of the passage?
| A．Animals move in order to find food more easily. |
| B．The migration of the fish called “salmon” is the most famous migration. |
| C．Living things move from one place to another because they like to travel. |
| D．Sometimes we know why and how living things move from one place to another, but sometimes we don’t. |
Today almost everyone knows computers and the Internet. If I ask you “What is the most important in your life?”, maybe you will say “Computers and the Internet.”
The first computer was made in 1946. It was very big but it worked slowly. Today computers are getting smaller and smaller. But they work faster and faster. What can computers do? A writer has said, “People can’t live without computers today.”
The Internet came a little later than computers. It is about twenty-five years later than computers. But now it can be found almost everywhere. We can use it to read books, write letters, do shopping, play games or make friends.
Many students like the Internet very much. They often go into the Internet as soon as they are free. They make friends on the Internet and maybe they have never seen these friends. They don’t know their real names, ages, and even sex (性别). They are so interested in making the “unreal friends” that they can’t put their heart into study. Many of them can’t catch up with others on many subjects because of that.
We can use computers and the Internet to learn more about the world. But at the same time, we should remember that not all the things can be done by computers and the Internet.The Internet cannot be used for __________．
| A．studying | B．shopping | C．thinking | D．playing |
When the computer was invented, it was__________．
| A．large and worked quickly | B．small and worked slowly |
| C．large but worked slowly | D．small but worked quickly |
The Internet was born in about __________．
| A．1960 | B．1970 | C．1980 | D．1985 |
Which of the following is true?
| A．Few students like going into the Internet. |
| B．Students use the Internet to make “unreal friends”. |
| C．These “unreal friends” often meet each other. |
| D．Students know the friends on the Internet very well. |
What does the writer think of the Internet?
| A．It is wonderful. | B．It can make students study harder. |
| C．It is not good for students. | D．It is helpful, but we can’t do everything on it. |
At two o’clock a bank robber stole in.“This is a holdup,” the man said loudly. He took a gun from under his jacket, pointing to George.“Hand it over!” George reached into his money-box and took all the bills from the top part-close to six thousand dollars. The robber took them and turned to leave.
Then, while everyone watched the robber, George calmly lifted the top part of the money-box, took bills from the bottom part and put them into his own pocket secretly.
The door was shut and the bank robber was gone. George fainted（晕倒）.
As soon as he was safely behind his bedroom door, George counted the money. He had eight thousand dollars. He was very happy.
The next morning, while the others were examining the bank's records, George was called into Mr Burrow's office and was introduced to Mr. Carruthers, who used to be president of the bank.
“Good morning, George, I was sorry to give you a hard time yesterday, but with all the banks being robbed these days I thought it would be a good idea to prove that our little bank can be robbed too. I have retired（退休）, but I’m always thinking of our bank. That's why I played my little game yesterday, just to keep everyone on his toes（趾）. Now, I have put the money back in your money-box all six thousand.”This passage tells us ______.
| A．a serious case | B．one part of a play |
| C．a humorous story | D．a meaningful story |
Which of the following do you think is true?
| A．George wanted to protect the money for the bank. |
| B．George had been thinking of taking money away. |
| C．This bank had been robbed several times. |
| D．Nobody knew the bank would be robbed that day. |
Why was George called into Mr. Burrow’s office?
| A．His stealing money was disclosed. |
| B．Mr. Burrow wanted to say sorry to him. |
| C．Mr. Carruthers wanted to explain the whole thing to him. |
| D．Mr. Burrow wanted to tell him the money had been put back. |
In this article “to keep everyone on his toes” means “______”.
| A．to make everyone work hard |
| B．to keep everyone standing straight |
| C．to make everyone do a kind of exercise |
| D．to keep everyone paying attention to the coming danger |
Which sentence can be used to end the story?
| A．George turned cold with fear. | B．George turned red with anger. |
| C．George was pleased with the end. | D．George was disappointed with the end. |