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When a Swedish ship that sank in 1628 was recovered from the port of Stockholm, historians and scientists were overjoyed with the chance to examine the remains of the past. The ship construction showed how ships were built and operated during the seventeenth century. In this way, artifacts, objects made by human beings, provided a picture of daily life almost 400 years ago.
Underwater archaeology-the study of ships, aircraft and human settlements that have sunk under large bodies of water-is really a product of the last 50 years. The rapid growth of this new area of study has occurred because of the invention of better diving equipment .Besides the Swedish ship wreck(残骸),underwater archaeologists have made more exciting discoveries such as the 5000-year-old boats in the Mediterranean Sea.
Underwater archaeology can provide facts abut the past. In ancient ports all over the world are ships sunken in the past 6,000 years. There are also sunken settlements in seas and lakes telling of pelples way of life and their systems of trade in ancient times. Underwater archaeologists want to study these objects to add to the world's knowledge of history, but they have to fight two enemies. One enemy is treasure hunters who dive for ancient artifacts that they can sell to collectors. Once sold, these objects are lost to experts. The second enemy is dredging machines(挖掘机)often used to repair ports. These machines destroy wrecks and artifacts or bury them deeper under sand and mud. By teaching the public about the importance of underwater“museums”of the past, archaeologists are hoping to get support for laws to protect underwater treasures.
1.What purpose does Paragraph 1 serve in the passage?
A. To provide background information of the topic
B. To attract readers' attention to the topic
C. To use an example to support the topic
D. To offer basic knowledge of the topic
2.The aim of underwater archaeology is to_________ .
A. exploit water bodies B. search for underwater life
C. study underwater artifacts D. examine underwater environment
3.Underwater archaeologists are worried because_____.
A. sea hunters have better diving equipment
B. their knowledge of world history is limited
C. dredging machines cause damage to the ports
D. sold artifacts can hardly be regained for research
4.What is the main purpose of the passage?
A. To introduce a young branch of learning. B. To discuss the scientists’problems.
C. To explain people’s way of life in the past. D. To describe the sunken ships.
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On May 21, 2000, some American scientists were working at the computers to look for information they needed . Suddenly they saw a lot of very bright red spots crossing the computers’ screens. At the same time the computers were working much slower. To find out what was happening they stopped their work to check some parts of the computers. To their horror, they found out that most of their stored information was got rid of by computer viruses (病毒). Obviously all these computers had been infected by computer viruses.
It is said that the computer viruses were made by two or three Philippine young men fond of playing tricks. They all had excellent education. They created the viruses just to show their intelligence. The kind of computer virus is named I Love You Virus. This virus can hide in computers for long. When the time comes they will attack the computers by lowering the important functions, damaging their normal programs or even getting rid of a great deal of information which operators of the computers often use or store, what’s worse, it still can reproduce itself in great quantities within a short time.
We come to know that “I Love You” Virus often attacks computers on Mondays and that it is spreading to many computers in the world. Among the countries that suffered computer viruses last year are Britain, Australia, Switzerland and the USA. Those who made the computer muses have been found out slowly and carefully. But till now, how to get rid of the terrible viruses remains a problem.
1.When the viruses attack the computers, the computers will work _______.
A. normally B. abnormally C. faster D. well
2 .Two or three Philippine young men created the computer viruses to _______.
A. damage the computers
B. test their ability quickly
C. tell the world that they were intelligent
D. play a trick in operators of the computers
3. According to the passage, computer viruses seem to________.
A. have been in nature for years
B. exist in any computers
C. be able to be got rid of in the near future
D. be difficult to get rid of at present
4.The most serious damage caused by the viruses is that_______.
A. the computer’s funtions are lowered
B. the normal programs are damaged
C. all the information stored in the computers is gone
D. the computers infected by the viruses can no longer be used
5. According to the passage, which of the following is true?
A. Scientists are trying to find a way to get rid of the viruses.
B. The viruses will come to the new computer after staying in the old one for some time.
C. Last year four countries found their computers were infected by viruses.
D. The “I Love You” Virus is a great harm to human health.
查看习题详情和答案>>Geniuses amaze us,impress us and make us all a little jealous. How do they differ from the average person?Scientists are working hard to figure out that answer. Tune in to the National Geographic Channel to find out about the discoveries they’re making in the series My Brilliant Brain.
When Marc Yu was only two years old,he began to play the piano. After a year, he started learning pieces by Beethoven. Now he’s a world-famous concert pianist at age eight. He learns newer and more difficult pieces with ease and can identify any note he hears. He seems to be specially designed for music. In Born Genius, National Geographic looks at the science behind child prodigies (神童) to explain why some children seem to be born without limits.
Geniuses didn’t come naturally to Tommy McHugh. His came only after he nearly died from bleeding in his brain. After recovering, McHugh’s head was filled with new thoughts and picture. So, he began to express them in the form of poetry and art. Now, he’s a seemingly unstoppable creative machine. Suffers of brain injury have shown that great mental ability can sometimes come from damage or disease. Accidental Genius explores this puzzling relationship.
Can normal people be trained to be geniuses? Susan Polger has shown no sign of extraordinary intelligence. Yet, during her childhood, she studied thousands of chess patterns and learned to recognize them immediately. As a result, she was able to beat skilled adult players by age 10 and can now play up to five games at the same time without even seeing the boards. Make Me a Genius examines what is takes to turn an ordinary brain into that of a genius.
If becoming a genius were easy, we’d all be done. Yet, there is much more to super intelligence than simply being born lucky. Learn more about amazing brains this month on National Geographic’s My Brilliant Brain.
1. In paragraph 2, Marc Yu’s story tells us_________________.
A. a child prodigy can work easier than others.
B. a child prodigy is trained by family.
C. a child prodigy has an unbelievable listening skill.
D. a child prodigy always practise his skills.
2.In paragraph 3, the sentence “Geniuses didn’t come naturally to Tommy McHugh.” means that ______________.
A. Tommy McHugh could not be called a genius.
B. Tommy McHugh became a genius when he was young.
C. Tommy McHugh was a robot but not a real human being.
D. Tommy McHugh became a genius after a sudden accident.
3.The writer provides different examples to _____________.
A. show how people can be geniuses. B. show becoming a genius is easy.
C. show geniuses are common. D. show people know how to explain geniuses.
4.The passage may come from_________.
A. a report B. a novel C. a TV program D. a newspaper
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Can you remember the first time you learned to ride a bike or drive a car?Learning these skills changed your life forever and opened up new horizons(视野).Learning about computers can be like learning how to ride a bike or drive a car.Once you have invested the time to master the skills,you will never go back to the old days.The new technology is simply too convenient and too powerful.
Technological developments through the years have enabled us to do more with less effort.We have continuously looked for better ways of doing things.Each invention and new development has allowed us to extend our capabilities.Today we see one of the most dramatic technologies ever developed—the computer.It extends the capabilities of our minds.
Computers have saved organizations millions of dollars. Furthermore,these same computer systems have opened up new opportunities that would have gone undiscovered or neglected.The computer may multiply what we can do,and the return on investment is high.The growth of computer usage is surprising. On the other hand,the computer can do serious damage.Invasion of privacy(侵犯隐私),fraud(欺诈),and computer-related mistakes are just a few shocking examples.?The computer is like a double-edged sword.It has the ability to cut us free from some activities,but it can also cut deep into profits,personal privacy,and our society in general.How it is used is not a function of technology.It is strictly a function of how people decide to use or misuse this new technology.The choice is yours,and only through a knowledge of computer systems will you be able to avoid the dangers while enjoying the many,many benefits of the computer age.
1.The writer thinks learning about computers is like learning how to ride a bike or drive a car because ______.
A.it is simple and practical B.it needs a lot of practice
C.it leads people to new life experiences D.it takes much time to master the skills
2.According to the passage,computers bring people the following benefits except ______.
A.avoiding mistakes B.saving money
C.making money D.opening up opportunities
3.According to the writer,the bad effects of computers can be avoided if we ______.
A.have some knowledge of computer systems
B.tell people not to misuse computers
C.have strict rules over the use of computers
D.make more investments in the technology
4.This passage is probably written for ______.
A.computers B.computer producers
C.computer learners D.computer programmers
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