Teenagers are often a difficult group. With all those hormones（荷尔蒙） flooding their bodies, they can be moody, unpredictable, and tend to make uncertain choices. But however confusing their teenage years are, kids can still be generally happy, depending on their lifestyle choices. According to a new research by British scientists, teens who don’t smoke, drink only moderately or not at all, and who don’t eat much junk food are likely to be happier than other teens.
The study looked at 40,000 British families and came up with some interesting findings. For example, kids who never drank alcohol were up to six times more likely to report higher levels of happiness than kids who drank. And teens who smoked were five times less likely to rate high on happiness charts compared to kids who don’t smoke. Same goes for diet and physical activity. The more fruits and vegetables kids eat, and the more hours they spend playing sports, the happier they are.
Now, of course this doesn’t mean that not smoking or drinking, and playing sports guarantees happiness. It could be that kids who have happy character tend to be more active and less addicted to drinking or smoking. And it could equally be the case that kids who are unhappy are more related to drinking and smoking and eating junk food.
Other studies have shown that exercise is a proven way to treat anxiety and depression. Future studies may support the idea that other healthful behaviors, including refraining(克制) from smoking, drinking, and eating too much junk, can avoid sadness and increase happiness, too.What can we learn from the text?
| A．Not smoking or drinking guarantees happiness. |
| B．Teens with flooding hormones can not be happy. |
| C．Playing sports can decrease teen’s unhappiness. |
| D．Unhappiness can certainly result in smoking and drinking. |
Which of the following might help teens quit anxiety?
| A．Smoking and drinking. |
| B．Taking exercise. |
| C．Eating junk food. |
| D．Going on a diet. |
Which can be the best title for the text?
| A．Ways to treat anxiety and depression. |
| B．Exercise and teenagers’ health. |
| C．Teenagers shouldn’t drink or smoke. |
| D．Teenagers’ lifestyle and their happiness. |
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 |
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 |