What will power your house in the future？Nuclear, wind or solar power？According to scientists at the Massachusetts Institute of Technology (MIT) in the US, it might be leaves — but artificial (人造的) ones.
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用). Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts (催化剂). Similar to natural leaves, it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card, scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Nocera at a conference of the American Chemical Society.
The artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf, by contrast, is made of cheap materials, easy to use and highly stable. In laboratory studies, Nocera showed that an artificial leaf prototype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera’s recent discovery of several powerful, new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now, the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides, the device can run in whatever water is available; that is, it doesn’t need pure water. This is important for some countries that don’t have access to pure water.
With the goal to “make each home its own power station” and “give energy to the poor”，scientists believe that the new technology could be widely used in developing countries，especially in India and rural China.Which of the following orders correctly shows how the artificial leaf is used to produce electricity?
a. artificial leaves split water into hydrogen and oxygen
b. the hydrogen and oxygen gases are stored in a fuel cell
c. the artificial leaves are put in water
d. the fuel cell uses hydrogen and oxygen to produce electricity
| A．c, a, b, d | B． c, b, a, d |
| C．b, c, a, d | D． c, a, d, b |
The purpose of the scientists at MIT in developing the new artificial leaf is to ________.
| A．build up more power stations in the world |
| B．provide cheaper energy for developing countries |
| C．offer people in developing countries access to pure water |
| D．gain a deeper understanding of the photosynthesis process |
The main idea of this passage is ________.
| A．an introduction to the history of artificial leaves |
| B．a mixture of water power and solar energy |
| C．giving energy to the poor |
| D．an invention copying photosynthesis |
When did you last see a polar bear? On a trip to a zoo, perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These "Polar Bears" are people who meet frequently in the winter to swim in freezing cold water. That day, the air temperature was 3℃, and the water temperature was a bit higher. The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60. Members must satisfy two requirements. First, they must get along well with everyone else in the group. This is very important because there are so many different kinds of people in the club. Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors do not agree about the medical effects of cold-water swimming. Some are worried about the dangers of a condition in which the body's temperature drops so low that finally the heart stops. Other doctors, however, point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits (or advantages) of cold-water swimming. They say that their favorite form of exercise is very good for the circulatory system（循环系统）because it forces the blood to move fast to keep the body warm. Cold-water swimmers usually turn bright red after a few minutes in the water. A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
The main benefits (or advantages) of cold-water swimming are probably mental. The Polar Bears love to swim year-round; they find it fun and relaxing. As one 70-year-old woman says. "When I go into the water, I pour my troubles into the ocean and let them float away."The members of the Polar Bear Club must meet the following requirements except that
__________.
| A．they must reach the age of 60 |
| B．they should be easy to make friends with |
| C．they must swim outdoors at least 8 times in the four cold months |
| D．they must agree to swim outdoors from November through February |
According to the passage, some doctors believe it is true that __________.
| A．you are healthy if cold-water swimming turns your skin color blue |
| B．cold-water swimming causes more heart attacks in summer than in winter |
| C．cold-water swimming can make the body temperature dangerously high |
| D．Polar Bears are bears swimming in freezing water |
The Polar Bears like to swim all the year round, for __________.
| A．they can remain young | B．it is an easy way to keep the body warm in winter |
| C．they find it enjoyable and interesting | D．they might meet fewer troubles in life |
The passage is mainly about __________.
| A．a group of cold-water swimming lovers |
| B．the polar bears' life |
| C．doctors' ideas about cold-water swimming |
| D．the requirements of the Polar Bear Club |
I began to grow up that winter night when my parents and I were returning from my aunt’s house, and my mother said that we might soon be leaving for America. We were on the bus then. I was crying, and some people on the bus were turning around to look at me. I remember that I could not bear the thought of never hearing again the radio program for school children to which I listened every morning.
I do not remember myself crying for this reason again. In fact, I think I cried very little when I was saying goodbye to my friends and relatives. When we were leaving I thought about all the places I was going to see—the strange and magical places I had known only from books and pictures. The country I was leaving and never to come back was hardly in my head then.
The four years that followed taught me the importance of optimism（乐观）, but the idea did not come to me at once. For the first two years in New York I was really lost—having to study in three schools as a result of family moves. I did not quite know what I was or what I should be. Mother remarried, and things became even more complex for me. Some time passed before my stepfather and I got used to each other. I was often sad, and saw no end to “the hard times.”
My responsibilities in the family increased a lot since I knew English better than everyone else at home. I wrote letters, filled out forms, translated at interviews with Immigration officers（移民局官员）, took my grandparents to the doctor and translated there, and even discussed telephone bills with company representatives.
From my experiences I have learned one important rule: Almost all common troubles go away at last! Something good is certain to happen in the end when you do not give up, and just wait a little! I believe that my life will turn out all right, even though it will not be that easy.How did the author get to know America?
| A．From radio programs | B．From books and pictures |
| C．From her mother | D．From her relatives |
For the first two years in New York, the author __________.
| A．often lost her way |
| B．did not think about her future |
| C．studied in three different schools |
| D．got on well with her stepfather |
What can we learn about the author from Paragraph 4?
| A．She worked as a translator. |
| B．She attended a lot of job interviews. |
| C．She paid telephone bills for her family. |
| D．She helped her family with her English. |
The author believes that __________.
| A．her future will be free from troubles |
| B．it is difficult to learn to become patient |
| C．there are more good things than bad things |
| D．good things will happen if one keeps trying |
Why did the chicken cross the road? To get to the other side.
Most people know this joke. But recently, some people have been much more worried about how the grizzly bear and mountain lion can cross the road.
“Millions of animals die each year on U.S. roads,” the Federal Highway Administration reports. In fact, only about 80 ocelots, an endangered wild cat, exist in the U.S. today. The main reason? Roadkill.
“Eco-passages” may help animals cross the road without being hit by cars. They are paths both over and under roads. “These eco-passages can be extremely useful, so that wildlife can avoid road accidents,” said Jodi Hilty of the Wildlife Protection Society.
But do animals actually use the eco-passages? The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an eco-passage that went under a highway. This showed that the lions used the passage.
Builders of eco-passages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals as different as salamanders（火蜥蜴）and grizzly bears are using the bridges and underpasses.
The next time you visit a park or drive through an area with a lot of wildlife, look around. You might see an animal overpass!The writer uses the example of “ocelots” to show that __________.
| A．wild animals have become more dangerous |
| B．the driving condition has improved greatly |
| C．an increasing number of animals are killed in road accidents |
| D．the measure for protecting wildlife fails to work |
From the story, we know an eco-passage is __________.
| A．an underground path for cars |
| B．a fence built for the safety of the area |
| C．a bridge for animals to get over a river |
| D．a path for animals to cross the road |
When the writer says that “animals seem to be catching on” (Para. 6), he means __________.
| A．animals begin to realize the dangers on the road |
| B．animals are crossing the road in groups |
| C．animals are increasing in number |
| D．animals begin to learn to use eco-passages |
The best title for the passage is __________.
| A．Special bridges help animals cross the road |
| B．Endangered animals increase because of roadkill |
| C．Animals fail to cross the road |
| D．Take steps to protect animals in danger |
I’m sure you know the song “Happy Birthday”. But do you know who wrote the song and for whom it was written?
The retired professor, Archibald A. Hill in Lucasville, USA could tell us the story. Ninety-seven years ago, two of Mr. Archibald Hill’s aunts, Miss Patty Hill and Miss Mildred Hill were asked to write some songs for a book called “Song Storied for the Sunday Morning”. Miss Patty Hill and Miss Mildred Hill were both kindergarten teachers then. They loved children very much and wrote many beautiful songs for the book. One of them was the famous “Good Morning to You.” The song said, “Good morning to you, good morning to you, dear children, good morning to all.” This song was very popular at that time among kindergarten children. But not many grown-ups knew it. A few years later little Archibald was born. As his aunt, Miss Patty Hill sang the song “Happy Birthday” to the melody（曲调）of “Good Morning to you” to her little nephew（侄子）. She sang the song like this: Happy birthday to you! Happy birthday to you! Happy birthday, dear Archie! Happy birthday to you!
Miss Patty Hill and her sister had never expected that this song would become so popular, but it really did. People all over the world like the song because of its simplicity in tune（曲调简单）and friendliness in words.Archibald A. Hill was __________.
A. English B. Russian C. American D. AustralianProfessor Archibald A. Hill was Miss Mildred Hill’s __________.
A. son B. student C. brother D. nephewWhy did Miss Hiss wrote songs?
| A．Because they are musicians. |
| B．Because they love children. |
| C．Because they were asked to write for a book. |
| D．Because their nephew asked them to do so. |
Andy rode slowly on his way to school, day-dreaming about the fishing trip that his father had promised him. He was so busy dreaming about all the fish he would catch that he was unaware of everything else around him.
He rode along until a strange sound drew him to the present. He came to a stop and looked curiously up to the heavens. What he saw shocked and terrified him. A huge swarm of bees filled the
sky like a black cloud and the buzzing mass seemed to be heading angrily towards him.
With no time to waste, Andy sped off in the opposite direction, riding furiously—but without knowing how to escape the swarm. With a rapidly beating heart and his legs pumping furiously, he sped down the rough road. As the bees came closer, his panic (惊慌) increased. Andy knew that he was sensitive to bee stings(蜇). The last sting had landed him in h
ospital—and that was only one bee sting! He had been forced to stay in bed for two whole days. Suddenly, his father’s words came to him. “When you are in a tight situation, don’t panic. Use your brain and think your way out of it. ”
On a nearby hill, he could see smoke waving slowly skywards from the chimney of the Nelson family home. “Bees don’t like smoke,” he thought. “They couldn’t get into the house.” Andy raced towards the Nelson house, but the bees were gaining ground. Andy knew he could not reach the house in time. He estimated that the bees would catch up with him soon.
Suddenly, out of the corner of his eyes, he spotted a small dam used by Mr. Nelson to irrigate his vegetable garden. Off his bik
e and into the cool water he lived, disappearing below the surface and away from the savage insects. After holding his breath for as long as he could, Andy came up for air and noticed the bees had gone. Dragging himself out of the dam, he struggled up the hilly slope and rang the doorbell. Mrs. Nelson took him inside and rang his mother.
“You’ll really need that fishing break to help you recover,” laughed his mother with relief. “Thank goodness you didn’t panic!” But Andy did not hear her. He was dreaming once again of the fish he would catch tomorrow.
Why did Andy fail to notice the swarm of bees earlier?
| A．He was riding to school. |
| B．He was listening to a strange sound. |
| C．He was going fishing with his father. |
| D．He was lost in the thought of the fishing trip. |
Which of the following is NOT mentioned about the swarm of bees in the passage?
| A．They crowded like a black cloud. |
| B．They shocked and terrified Andy. |
| C．They tried to attack Andy in a mass. |
| D．They made Andy stay in hospital for two days. |
How did Andy avoid the bees in the end?
| A．He asked Mr. Nelson for help. |
| B．He did himself under the water. |
| C．He rushed into the Nelson house. |
| D．He rode off in the opposite direction. |
Which of the following can best describe Andy’s escape from the bees?
| A．No pains, no gains. |
| B．Once bitten, twice shy. |
| C．Where there is a will, there is a way. |
| D．In time of danger, one’s mind works fast. |