Sydney—A shark savaged a schoolboy's leg while he was surfing with his father at a beach in Sydney on February 23．It was the third shark attack along the coast of Australia's largest city in a month．
The 15-year-old boy and his father were in the water off Avalon, on Sydney's northern beaches, around dawn when he was attacked．The city's beaches are packed with locals and tourists during the summer months．
"The father heard a scream and turned to see his son trashing （扭动） about in the water," police said．"Fortunately, the shark swam away and the boy was helped to shore by his father．
Lifesaving Club spokesman Nick Miller: "It got him around the top of his left leg and the father came and dragged him out of water．" He said the boy was bleeding heavily when he was brought to shore．"There was a lot of pain, as you can imagine"．The teenager was airlifted to hospital for treatment for leg injuries．
Police said the bites" cut through to the bone" , but the boy did not appear to have sustained any fractures （骨折）．He was in a stable condition now．
Several beaches were closed after the attack．Water police and lifeguards were searching for the shark, while police hoped to identify its species by the shape of the bite marks．But they said it was too early to say what type of shark attacked the boy．"I don't even know if he saw it," Miller said．
Many shark species live in the waters off Sydney's beaches, but attacks on humans are still relatively rare．However, there were two attacks on successive days earlier this month, one on a navy diver in Sydney harbor, not far from the famous Opera House, and the other on a surfer at the city's world-famous Bondi beach．
Fishermen say shark numbers are on the rise．There is a ban on commercial fishing in the harbor, which has increased fish stocks．Marine experts also claim environmental protection has created a cleaner environment, attracting sharks closer to shore as they chase fish．Many shark species, including the Great White—the man-eater made famous in Steven Spielberg's Jaws—are protected in Australian waters．The report mainly tells us _______．
| A．shark attacks on humans are on the rise |
| B．sharks attacked humans three times in one month |
| C．a boy was attacked by a shark at a Sydney beach |
| D．shark numbers are increasing in the waters off Sydney's beaches |
The underlined word" savaged "in the first paragraph probably means _______．
| A．attracted | B．dragged |
| C．bit | D．packed |
What do we know about the city of Sydney from the passage?
| A．It is one of the largest cities in Australia． |
| B．Sydney harbor is not far from the famous Opera House． |
| C．There are many locals and tourists on its coast all year round． |
| D．There are few shark species in the waters off Sydney's beaches． |
All the followings are the causes of Australia's sharks increasing EXCEPT that_______．
| A．environmental protection has created a cleaner environment |
| B．a ban on commercial fishing has increased fish numbers |
| C．many shark species are protected in Australia waters |
| D．the film Jaws made the Great White famous |
阅读下面的短文，从每题所给的四个选项(A、B、C、D)中，选出最佳选项。
Rush hour traffic is a problem in many big cities around the world. Commuters(道勤者)rush to and from their jobs in cars, buses, subways, trains, and even on bicycles. Large cities in the United States have two rush hours—one in the morning and one in the evening. But in cities in other parts of the world, there are four rush hours. In Athens and Rome, for example, many workers go home for lunch and a nap. After this midday break, they rush back to their jobs and work for a few more hours.
In Tokyo, there's a big rush hour underground. Most of the people in Tokyo take the subways. The trains are very crowded. Subway employees called packers wear white gloves and help pack the commuters into the trains when the doors place. They make sure that all purses, briefcases, clothes, and hands are inside the trains.
In Seoul, many computers prefer to take taxis to get to work. To hail_a_cab,_many people stand at crossroads and raise two fingers. This means they'll pay the cab driver double the usual fare. Some people even raise three fingers! They'll pay THREE times the normal rate.
Streets in Rome are very crowded with automobiles and mopeds(摩托自行车)during rush hours. The city can't make its streets wider, and it can't build new highways, because it doesn't want to disturb many historic sites in the city, such as the Forum and the Colosseum. It took the city fifteen years to construct a new subway system. Construction had to stop every time workers found old artifacts and discovered places of interest to archaeologists(考古学家)．
In many big cities, there are special lanes on highways for carpools. These are groups of three or more people who driver to and from work together. They share the costs of gas and parking and take turns driving into the city.
Getting to work and getting home can be difficult in many places around the world. Rush hour traffic seems to be a universal problem.Big cities have traffic problems during rush hours because there are________.
| A．special lanes on highways |
| B．many commuters |
| C．four rush hours |
| D．many cars on the street |
Most of commuters in Tokyo________.
| A．take subway trains to work |
| B．are packers |
| C．take taxis to work |
| D．carry briefcases to work |
To “hail a cab” means to________.
| A．pay double the normal rate |
| B．try to get a cab |
| C．prefer to take taxis |
| D．to stand at crossroads |
Why did it take a long time to build a subway system in Rome?
| A．Because the streets were very crowded. |
| B．Because there are many historic sites. |
| C．Because the workers discovered many artifacts and places of interest. |
| D．Because the traffic always stopped the construction. |
Commuters in carpools probably________.
| A．live in the city |
| B．take the subway to work |
| C．save money on gas and parking fees |
| D．have special license plates(牌照) |
Tokyo is one of those places that you can love and hate at the same time.
In Tokyo there are always too many people in the places where I want to be. Of course there are too many cars. The Japanese drive very fast when they can. But in Tokyo they often spend a long time in traffic jams. Tokyo is not different from London, Paris and New York in that. It is different when one wants to walk.
At certain times of the day there are a lot of people on foot in London's Oxford Street. But the streets near Ginza in Tokyo always have a lot of people on foot, and sometimes it is really difficult to walk. People are very polite; there are just too many of them.
The worst time to be in the street is at 1130 at night. That is when the nightclubs are closing and everybody wants to go home. There are 35 000 nightclubs in Tokyo, and you do not often see one that is empty.
Most people travel to and from work by train. Tokyo people buy six million train tickets every day. At most stations, trains arrive every two or three hours. There do not seem to be enough trains. Although they are usually crowded, Japanese trains are very good. They always leave and arrive on time. On a London train you would see everybody reading a newspaper. In Tokyo trains everybody in a seat seems to be asleep, whether his journey is long or short.
In Tokyo, I stood outside the station for five minutes. Three fire- engines raced past on the way to one of the many fires that Tokyo has every day. Tokyo has so many surprises that none of them can really surprise me now. Instead, I am surprised at myself：I must go there next year on business. I know I hate the overcrowded city. But I feel like a man who is returning to his long-lost love.Tokyo is different from London in that________.
| A．it has a larger population |
| B．there are more traffic jams |
| C．it is more difficult to go somewhere on foot |
| D．night clubs are sometimes empty |
Japanese trains________.
| A．often leave and arrive on time |
| B．are often crowded |
| C．are the main means people used to travel to and from work |
| D．all of the above |
Where can you find everybody reading a newspaper?
| A．At most London train stations. |
| B．At most Tokyo train stations. |
| C．On a Tokyo train. |
| D．On a London train. |
Fires break out ________in Tokyo according to the writer.
| A．quite frequently |
| B．only several times a day |
| C．not very often |
| D．very seldom |
Which of the following is NOT true about Tokyo?
| A．The streets become more crowded at 1130 at night. |
| B．There are more trains than cars. |
| C．Fire-engines are very busy in the city. |
| D．Tokyo people are friendly. |
With only about 1,000 pandas left in the world, China is desperately trying to clone(克隆)the animal and save the endangered species(物种). That's a move similar to what a Texas A & M University researchers have been undertaking for past five years in a project called “Noah's Ark”．
Noah's Ark is aimed at collecting eggs, embryos(胚胎), semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas A & M's College of Veterinary Medicine, says there would be enough of the basic building blocks reintroduce the species in the future.
It is estimated that as many as 2,000 species of mammals, birds, reptiles will become extinct in over 100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.
This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host animal.
The entire procedure could take from three to five years to complete.
“The nuclear transfer(核子移植)of one species to another is not easy, and the lack of available(capable of being used)panda eggs could be a major problem，”Karemer believes. “They will probably have to do several hundred transfers to result in one pregnancy(having a baby). It takes a long time and it's difficult, but this could be groundbreaking science if it works. They are certainly not putting any live pandas at risk, so it is worth the effort，” adds Kraemer, who is one of the leaders of the Project at Texas A & M, the firstever attempt at cloning a dog.
“They are trying to do something that's never been done, and this is very similar to our work in Noah's Ark. We're both trying to save animals that face extinction. I certainly appreciate their effort and there's a lot we can learn from what they are attempting to do. It's a research that is very much needed.”The aim of “Noah's Ark” project is to________.
| A．make efforts to clone the endangered pandas |
| B．save endangered animals from dying out |
| C．collect DNA of endangered animals to study |
| D．transfer the nuclear of one animal to another |
According to Professor Kraemer, the major problem in cloning pandas would be the lack of________.
| A．available panda eggs | B．host animals |
| C．qualified researchers | D．enough money |
The best title for the passage may be________.
| A．China's Success in Pandas Cloning |
| B．The First Cloned Panda in the World |
| C．Exploring the Possibility to Clone Pandas |
| D．China—the Native Place of Pandas Forever |
From the passage we know that________.
| A．Karemer and his team have succeeded in cloning a dog |
| B．scientists try to implant a panda's egg into a rabbit |
| C．Kraemer will work with Chinese scientists in clone researches |
| D．about two thousand of species will probably die out in a century |
A visit to NASA Langley Research Center would be very exciting. You could meet NASA scientists and engineers working with wind tunnels.
Wind tunnels are basically tubes through which air—or a gas—is moved to make “wind” in the tube. This “wind” moves past objects such as airplanes or just parts from airplanes.
It s always a good idea to test a new aircraft design in a wind tunnel before you build the real aircraft. Models tested in wind tunnels will always go through design changes before engineers are satisfied with its design and test results.
Wind tunnels are constructed with some very wide sections as well as some sections much smaller in size. An “open return wind tunnel”is open at both ends of the tube. It is usually largest at one end of the tube where you may even see the fan blade(风扇片)that creates the wind. This tube gets smaller as you move away from the fan blade. The tube begins to straighten in the next part of the wind tunnel called the Test Section. This is where you place the model for testing. The tube widens again as you move away from the Test Section.
Another wind tunnel is the “closed return” design. This tunnel is completely contained inside a building. The tunnel moves in a “loop” inside the building. A fan is located in the tunnel on one side of the building and the test model is located in the tunnel's Test Section on the other side of the building.
NASCAR race teams even test their race cars in wind tunnels to test and improve a car's design. These teams work hard to reduce a car's drag. In less than 150 years, wind tunnels have allowed mankind to improve cars on the ground, aircraft in the atmosphere, and spacecrafts in space. We can only imagine what will happen with wind tunnels during the next hundred years.What could be the best title of the passage?
| A．What Are Wind Tunnels Made of? |
| B．What Is a Wind Tunnel and How It Works? |
| C．Where Can Wind Tunnels Be Found? |
| D．Why Are Wind Tunnels Used? |
Which of the following is the right shape of an “open return wind tunnel”？
In the “close return” wind tunnel, the fan is fixed________.
| A．in the Test Section on the other side of the building |
| B．next to the models in the building |
| C．at one end of the opening |
| D．on the other side of the Test Section |
By reducing a race car's drag, ________.
| A．the car will becomes lighter |
| B．the car will be easy to operate |
| C．the car will move faster |
| D．the car will look more beautiful |
The private automobile(私家车)has long played an important role in the United States. In fact, it has become a necessary and important part of the American way of life. In 1986, sixty-nine percent of American families owned at least one car, and thirty-eight percent had more than one. By giving workers rapid transportation, the automobile has freed them from having to live near their place of work. This has encouraged the growth of the cities, but it has also led to traffic problems.
For farm families the automobiles is very helpful. It has made it possible for them to travel to town very often for business and for pleasure, and also to transport their children to distant schools.
Family life has been affected(影响)in various ways. The car helps to keep families together when it is used for picnics, outings, and other shared experiences. However, when teenager children have the use of the car, their parents can't keep an eye on them. There is a great danger if the driver has been drinking alcohol or taking drugs—or is “showing off” by speeding or breaking other traffic laws. Mothers of victims(受害者)of such accidents have formed an organization called MADD(Mothers Against Drunk Driving). These women want to prevent further tragedies(悲剧). These women want to prevent further tragedies(悲剧). They have worked to encourage the government to limit the youngest drinking age. Students have formed a similar organization SADD(Student Against Drunk Driving)and are spreading the same message among their friends.
For many Americans the automobile is a necessity. But for some, it is also a mark of social position and for young people, a sign of becoming an adult. Altogether, cars mean very much to Americans.Which of the following is NOT mentioned in the text?
| A．Cars have encouraged the growth of the cities. |
| B．Cars can bring families together when they go for picnics. |
| C．Cars have enabled people to live far from their place for work. |
| D．Cars help city families to transport their children to faraway schools. |
What has been done to deal with the problem of drunk driving?
| A．Parents have paid more attention to their children. |
| B．Some organizations have been set up against drunk driving. |
| C．Mothers have tried to persuade their children not to drink alcohol. |
| D．University students have asked the government to solve the problem. |
We can infer from the text that________in American.
| A．it will be more difficult for people to get new cars |
| B．parents will not allow their children to have their own cars |
| C．the government will encourage people to use public transportation |
| D．cars will still be popular though they have caused many problems |