On October 12, 1987, some Chinese scientists were working at the computers to look for information they needed. Suddenly they saw a lot of very bright spots(点 )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(恐惧), they found out that most of their stored information was got rid of( 除掉) by computer viruses! Obviously all these computers had been infected（感染 ） by computer viruses.
It is said that the computer viruses were made by a group of young man fond of playing tricks. They all had excellent education. They created the viruses just to show their intelligence.（才智）These kinds of computer viruses are named Jerusalem( 耶路撒冷 )Viruses. These viruses can stay in computers for a long time. When the time comes they will attack the computers by lowering the function(功能), damaging their normal programs or even getting rid of all the information.
We now come to know that Jerusalem Viruses often attack computers on Fridays and that they are spreading(传播) to a list of computers. Among the countries that suffering computer viruses are Britain, Australia, Switzerland and the U.S. But till now, how to get rid of the terrible remains a problem.The group of young men created the viruses to __________.
| A．damage the computers |
| B．test their ability |
| C．play a trick on operators of the computers |
| D．tell the world that they were intelligent |
According to the passage, computer viruses seem to _______.
| A．have been in nature for years |
| B．be difficult to get rid of at present |
| C．exist（存在） in any computers |
| D．be able to be got rid of in the near future |
The most serious damage caused by the viruses is that _______.
| A．all the information stored in the computers is gone |
| B．the computer’s functions are lowered |
| C．the normal programs are damaged |
| D．the computers infected by the viruses can no longer be used |
According to the passage, which of the following is true?
| A．Four countries found their computers were infected by viruses. |
| B．The viruses will come to a new computer after staying in the old one for some time |
| C．The Jerusalem Viruses are a great harm to human health. |
| D．Scientists are trying to find a way to get rid of the viruses |
How many coins have you got in your pocket right now?Three?Two?Or one?With a phonecard you can make up to 200 calls without any change at all.
1.What do you do with it?
Go to a telephone box marked “Phonecard”.Put in your card,make your call and when you've finished,a screen tells you how much is left on your card.It costs no extra for the cards,and the calls cast 10 per unit,the same as any other payphone call.You can put them in units of 10,20,40,100 or 200.
2.Now appearing in a shop near you
Near each card phone place you'll find a shop where you can buy one.They're at bus,train and city tube stations.Many universities,hospitals and clubs,restaurants and gas stations on the highway and shopping centers.At airports and seaports.
3.No more broken payphones
Most broken payphones are like that they've been vandalized（破坏了的）.There are no coins in Cardphone to excite thieves' interest in it.So you're not probably to find a vandalized one.Get a phonecard yourself and try it out.Or get a bigger wallet.There are three sections in the passage.Which section do you think is about why phonecards are good?
| A．Section 1. | B．Section 2. | C．Section 3. | D．Section 1&2. |
Choose the right order of the steps under“How to use a phonecard”.
a.Put in your phonecard.
b.Look at the screen to find out how many calls you can still make.
c.Go to a telephone box marked “Phonecard”.
d.Make your call.
| A．a,b,c,d | B．c,a,d,b | C．a,d,c,b | D．c,d,a,b |
The last sentence “Or get a bigger wallet”means“_________”.
| A．Phonecards are cheap |
| B．You cannot use all payphones |
| C．Thieves will not break card phones |
| D．People do not like carrying a lot of coins |
Bill Clinton was born on Aug.19,1946.Three months before his birth,his father had died when driving home to his pregnant wife,Virginia,he went off a high way,was thrown from the car and drowned in a river.
When Bill was 4,his mother remarried Roger Clinton.And there were always troubles:a sometimes voilent,alcoholic stepfather and a half-brother.Only one year after the marriage,the drunken stepfather fired a shotgun at the ceiling to keep his bride and stepson from leaving the house.Virginia was very much frightened.So Roger Clinton beat Virginia from time to time.But teenager Clinton played a role of protector of his mother bravely.The stepfater never laid another band on Virginia.
In high school,he was very good at Latin and maths.He also played saxophone in the hand.At age 16,as a member of a youth group,Clinton met President John F.Kennedy at the White House,it led him to the life of public service.Once he set his mind to do something,he did not give up.He was elected governor of Arkansas at the age of 32.
Clinton has said he ran for president to make the country a better place for people like Chelsea,his daughter.He did win.At the age of 46,he became the third youngest president in the nation's history.When this passage was published,Clinton was_________.
A.governor of Arkansas B.a famous professor
C.President of U.S.A. D.President of a universityClinton's own father died_________.
| A．before Clinton was born |
| B．after Clinton was born |
| C．from drinking too much brandy |
| D．when Clinton's mother was giving birth |
Clinton protected his mother by_________.
| A．fighting against his stepfather |
| B．beating his stepfather |
| C．having long talks with his stepfather |
| D．the means we don't know |
The word “it” in “It led him to the life of public service”refers to_________.
| A．Clinton's high school education |
| B．becoming a member of a youth group |
| C．Clinton's visiting President Kennedy |
| D．doing public service |
Americans have contributed to many art forms,but jazz,a type of music,is one of the art forms that was started in the United States.Black Americans,who sang and played the music of their homeland,created jazz.
Jazz is a mixture of the music of Africa,the work songs the slaves sang,and religious（宗教）music.Improvisation is an important part of jazz.This means that the musicians make the music up as they go along,or create the music on the spot.This is why a jazz song might sound a little different each time it is played.
Jazz bands formed in the late 1800s.They played in bars and clubs in many towns and cities of the South,especially New Orleans.New Orleans is an international seaport,and people from all over the world come to New Orleans to hear jazz.
Jazz became more and more popular.By the 1920s,jazz was popular all over the United States.By the 1940s,you could hear jazz not only in clubs and bars,but in concert halls as well.Today,people from all over the world play jazz.Jazz musicians from the United States,Asia,Africa,South America,and Europe meet and share their music at festivals on every continent.In this way jazz continues to grow and change.What can be the best title of the passage?
| A．American Art Forms | B．The Development of Jazz |
| C．The Music of Black Americans | D．The Birthplace of Jazz |
Which of the following is TRUE?
| A．Jazz is now popular all over the world. |
| B．Jazz is now a kind of religious music. |
| C．Jazz is now played only in bars and clubs. |
| D．Jazz is now played a little differently sometimes. |
From the text it can be inferred that_________.
| A．New Orleans is the place where jazz was first produced |
| B．the American people are all jazz lovers |
| C．jazz is merely sung by the black when working |
| D．jazz may become more popular as time goes on |
It took about _________ years to make jazz popular in the United States.
| A．200 | B．120 | C．80 | D．40 |
Snow-melting Agent
A heavy snow can kill pests and this means a good harvest next year.This will bring as well as trouble to urbanites.
On Nov.16,2003,a cold air current brought a heavy snow to Beijing.To prevent traffic jams,related government departments mobilized people to clear off snow on streets.
One of the most effective ways to clear off snow on roads is to scatter snow-melting agent on the roads.The major component of the snow-melting agent is salt.The snow-melting agent can make snow stop from freezing,make it easier to clear off the road,and allow traffic to flow smoothly.But it also brings about some hidden dangers.In the spring of 2003,over 300 000 trees in Beijing urban districts died.After analyzing soil around these trees,experts discovered that the salt content of these soils was 392 times higher than normal.Where did the excessive salt come from?After investigating,forestry experts found that when clearing snow in the winter,people usually heap snow containing snow-melting agent at trees’ roots,and that when the snow melts,this agent penetrates the soil and increases its salt content.The snow-melting agent indirectly killed the trees.
Statistics show that during a heavy snow in 2002,over 1000 tons of snow-melting agent was scatterred on streets in Beijing.Snow water containing a large amount of snow-melting agent got into the soil through sewers.
In addition,salt in the snow-melting agent can expedite the corrosion of steel bars in concrete buildings and cause the concrete to crack and peel,shortening the life of roads.
Scientists and government officials are required to solve traffic problems caused by heavy snows as soon as possible and at the same time try to reduce the negative effects of the snow-melting agent.This is a difficult problem placed before them.Related authorities have framed some local criteria to regulate the production and use of snow-melting agents.
Now,more harmless snow-melting agents are being developed.Now that even snow-melting agents that meet today’s criteria must still be used carefully,we have to rely more on our manpower and machines to clear off snow.
This year,in addition to using snow-melting agents,Beijing will use a large number of snow vehicles to clear snow on roads.In more places,citizens are mobilized to clear snow with their hands.This may be a test of a city’s civilization level.Salt is a snow-melting agent while _________ is a cleaning agent.
| A．water | B．soap | C．a washing-machine | D．a housewife |
The third paragraph of the text is mainly about _______.
| A．the side effect of snow-melting agent |
| B．a case of damage to trees caused by snow-melting agent |
| C．the results of using snow-melting agent |
| D．the uses of snow-melting agent |
According to the text,the most practical way to clear off snow is to _________.
| A．use snow-melting agent as much as possible |
| B．only use more harmless snow-melting agent |
| C．encourage people to clear snow with their hands |
| D．use more snow vehicles |
This text most probably appears in_________.
| A．a newspaper | B．a magazine on latest findings |
| C．a book on salt | D．a magazine on environmental protection |
Though “nanometer” is now a fashionable term all over the world,few people know exactly what it is.It has become a new favorite of manufacturers and sellers in recent years.Many “high-tech” products bearing the name “nano” have entered the market,bringing more mysterious feeling to surprised consumers.
Nanometer is a very small length unit of measure,and is very small.One millimeter is 1000 micrometers,and one micrometer is 1000 nanometers.That is,one nanometer is one billionth of a meter.Nano materials are solid materials composed of particles or crystallites of less than 100 nanometer in size.Then,is a cup made of nano material really any different from an ordinary cup in function as far as how it works?
Are nano cups really so wonderful?A reporter went to the Institute of Nanomedicine,which is the first such institute of such a sort in the world and the only one in China,specializing in researching the investigation of the application of nano technology into medicine.
Ji(director Institute of Nanomedicine):
A water molecule is composed of 2 hydrogen atoms and 1 oxygen atom.It can be alterchanged only by special manipulation of the atoms.The material constituting the cup can have a nanometer particles size of the nano level.But it cannot change the chemical and physical properties of the water contained in it.The water in the cup is still water.When people drink it,it will produce no special effect on human body.
Prof.Ji told the reporter,so far,the investigation of nano materials is still confined in the laboratory.No commercial micro products can be produced yet.With the present level of science and technology,the time of everyday goods age of daily use articles made of nanometer materials is still years away.
The commodities labeled with nano marks in the market now are only traditional products coated with a thin layer of nanometer material,which makes them more abrasion resistant,much easier to be cleaned,or oil repelling or moth proof.
Prof.Ji explained that nano cup is a real cup.It can also be included in the list of nano products in a certain sense.But the nano cup has not changed its property and function as a cup.It is not a magical medicine for curing and health care.Which of the following shows the right relationship?
| A．nanometer<millimeter<micrometer<meter |
| B．nanometer<micrometer<millimeter<meter |
| C．micrometer<millimeter<nanometer<meter |
| D．millimeter<micrometer<nanometer<meter |
The underlined part in the last second paragraph but one is about_________.
| A．the strong points of nano cups | B．the shortcomings of nano cups |
| C．the uses of nano cups | D．the wonders of nano cups |
Which of the following does not show that nano cups are different from ordinary cups?
| A．Nano cups can’t make people healthier. |
| B．Nano cups are made of a different material. |
| C．Nano cups are much easier to be cleaned. |
| D．Nano cups are hard to produce. |
According to the text,nano cups in the market are_________.
| A．only traditional products |
| B．ordinary cups covered with a little nanometer material on the surface |
| C．cups made of a nano material |
| D．cups made of a mixed material |
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