An early invention by Albert Einstein has been rebuilt by scientists at Oxford University. They are trying to develop an environmentally friendly refrigerator that runs without electricity.
We all know that modern fridges cause damage to the environment. They work by using a kind of man-made greenhouse gas called Freon (氟里昂), which is far more damaging than carbon dioxide.
Now Malcolm McCulloch, an electrical engineer at Oxford, is leading a three-year project to develop appliances that can be used in places without electricity.
His team has completed a prototype (样机) of a fridge patented in 1930 by Einstein. It used only pressurized gases to keep things cold. The design was partly used in the first refrigerators, but the technology was dropped when more efficient compressors (压缩机) became popular in the 1950s. That meant a switch to using Freon.
Einstein's idea uses butane (丁烷) and water and takes advantage of the fact that liquids boil at lower temperatures, when the air pressure around them is lower.
"If you go to the top of Mount Qomolangma, water boils at a much lower temperature than it does when you're at sea level and that's because the pressure is much lower up there," said McCulloch.At one side is the evaporator (蒸发器), a bottle that contains liquid butane. "If you introduce a new vapor above the butane, the liquid boiling temperature decreases and, as it boils off, it takes energy from the surroundings to do so," says McCulloch. "That's what makes it cold."
The gas fridges based on Einstein's design were replaced by Freon-compressor fridges partly because Einstein's design was not very efficient. But McCulloch thinks that by changing the design and replacing the types of gases used it will be possible to quadruple (翻两番) the efficiency.
However, McCulloch's fridge is still in its early stages. "It's very much a prototype," he said. "Give us another month and we'll have it working."． According to the passage, an early invention by Albert Einstein _______.
| A．has been rediscovered because it costs much less and works more efficiently |
| B．is being redesigned because it could be used in places without electricity |
| C．has just been found to be energy-saving and environmentally friendly |
| D．will be fully made use of and become the fridge of the future |
．Which of the following is TRUE according to the text?
| A．Freon was used in fridges long before the 1950s. |
| B．Freon is what makes current fridges big polluters. |
| C．McCulloch thinks he could improve Einstein's design by using other types of vapors. |
| D．The fridge Malcolm McCulloch and his team designed will be put into production soon. |
．We can learn from the text that the prototype completed _______.
| A．changed the air pressure around it |
| B．was tested on the top of Mount Everest |
| C．increased the liquid boiling temperature |
| D．used only pressurized gases to keep things cold |
．McCulloch's words in Paragraph 6 _____.
| A．serve as an explanation for the principle behind Einstein's fridge |
| B．give you the reason why Einstein's fridge was not efficient |
| C．tell you how to take advantage of low air pressure |
| D．show you how Einstein's fridge works |
The Mystery of the Flashing Fireflies
During summer nights fireflies flash in the darkness. They look like bright spots of light dancing on the breeze. Catching them in a jar for a few minutes can be fun. Fireflies are not really flies, though. They are winged beetles. Scientists are using these special beetles to learn more about our world.
The reason a firefly flashed its light is to find a mate. There are around two thousand species, or kinds, of fireflies. Fireflies mate only with their own species. Each kind of firefly has its own flash pattern. It is important that fireflies recognize this pattern. That way they can find bugs of their own kind. The male firefly flies around in the sky while the female firefly stays close to the ground.
For many years, how a firefly flashes its light was a mystery. Scientists now know that a firefly’s light is a cold light. It gives off all of its power as light. It does not produce heat. A normal light bulb gives off only ten percent of its power as light. The rest of the power is wasted as heat. That is why a light bulb that has been on for a while is very hot. The firefly’s light does not feel hot like a light bulb.
Scientists have also learned that fireflies have a small built-in lantern. This special lantern is located inside a firefly’s body. To create light, a gas flows through tiny tubes. This causes the firefly to light up. A firefly can also turn its light on and off quickly. This puzzled scientists. They learned that short bursts of this gas make the firefly glow. When the gas fades, the light goes out. This process happens very quickly.
Scientists know that what they learn from fireflies will be important. Medical studies using fireflies are helping scientists fight illnesses in human beings. They have made new medicines from the chemicals used by fireflies to make light. Fireflies have also helped with new discoveries. New flashlights and flares have been made based on fireflies. These new flashlights and flares produce a cold light like a firefly. This way all the power makes the light shine. This little bug may be a pleasure to watch, but it is also an important part of our lives.Why did the author most likely include Paragraph 4?
| A．To explain how fireflies make light. | B．To describe different kinds of fireflies. |
| C．To show how much power fireflies use. | D．To describe why fireflies make light. |
Which of these is the best choice for a heading for Paragraph 5?
| A．The Cool Light of Fireflies | B．Watching Fireflies Flash |
| C．Understanding the Patterns | D．Learning from Fireflies |
According to the passage, a firefly’s light is different from a light bulb’s light because the firefly’s light _______.
| A．shines brighter | B．does not fade | C．lasts longer | D．is not hot |
A reader asks this question about the passage: “ How many different kinds of fireflies are there?” Which paragraph from the passage answers the question?
| A．Paragraph 2 | B．Paragraph 3 | C．Paragraph 4 | D．Paragraph 5 |
The author most likely wrote this passage in order to __.
| A．tell why fireflies light up | B．give facts about fireflies |
| C．show how fireflies help doctors | D．compare a firefly to a light bulb |
Most Americans have great respect for their flag and every school day begins with the Pledge of Allegiance to the Stars and Stripes. Written in 1892, this pledge is recited in schools before classes begin and it serves as a sign of unity and identity for the various groups of people who have come from so many different lands and cultures.
Students stand at attention with their right hand over their heart, face the flag which is displayed in the classroom before them and begin, “I pledge allegiance to the flag of the United States of America.” Even the immigrants who come from distant lands must recite this pledge to the flag when they become eligible for citizenship.
The American flag is also known as “Old Glory” and over the years has evolved to its present form of fifty stars and thirteen stripes. The stars represent the fifty states and the stripes stand for the original thirteen colonies.
The first version of the flag with its stars and stripes appeared in 1777, but only had thirteen stars. As each new state joined the union, a new star was added. The last star to be added was in 1960 after Hawaii became the fiftieth state. In the future if another state joins the Union, another star will be added to the field of blue. The number of stripes, however, remains consistent and never changes.
The design of the flag may have altered over the years, but the colors, red, white and blue, have remained constant. In 1782 the Congress of the United States proclaimed that red stood for hardiness and courage, white stood for purity and innocence, and blue for justice and perseverance.
It was the flag which inspired the creation of the national anthem: “The Star Spangled Banner” in 1812. President Wilson in 1916 and later President Coolidge in 1927 suggested in proclamations to fellow countrymen that a special day be set aside to honor the flag. In 1949 the American Congress gave official recognition of June 14 as Flag Day.According to the passage which of the following statements is NOT true?
| A．The Pledge of Allegiance was written in 1892. |
| B．Another name of the American flag is “Old Glory” or “The Stars and Stripes”. |
| C．The design of the flag has stayed the same over the years. |
| D．June 14 was set aside as Flag Day to honor the flag from 1949 on. |
What is the purpose of the Pledge of Allegiance?
| A．It opens the school day. | B．It is recited in all schools. |
| C．It is a sign of unity and nationalism. | D．It makes someone eligible for citizenship. |
What do the fifty stars on the flag represent?
| A．Purity and innocence. | B．Truth and honesty |
| C．Bravery and courage | D．The fifty states. |
The colors of the American flag ________.
| A．have changed from time to time. | B．have always been red, white and blue. |
| C．used to be only red and white. | D．used to be red and blue. |
The best title of the passage would be ________.
| A．“Old Glory”: the American Flag | B．The Pledge of Allegiance |
| C．American National Anthem | D．Flag Day |
PLAYA GRANDE, COSTA RICA----This resort town was long known for Leatherback Sea Turtle（棱皮龟）National Park, nightly turtle beach tours and even a sea turtle museum. However, on a beach where dozens of turtles used to nest on a given night, scientists spied only 32 leatherbacks all of last year.
With leatherbacks threatened with extinction, Playa Grande’s turtle museum was abandoned （抛弃）three years ago and now sits among a sea of weeds. And the beachside ticket office for turtle tours was washed away by a high tide in September. “We do not promote that as a turtle tourism destination any more because we realize there are far too few turtles to please,” said Alvaro Fonseca, a park ranger.（管理员）
Even before scientists found temperatures going up over the past decade, sea turtles were threatened by beach development, drift net fishing and Costa Ricans’ interest in eating turtle eggs. But climate change may cause the most serious harm to an animal that has lived in the Pacific for 150 million years.
Sea turtles are sensitive to numerous effects of warming. They feed on reefs, which are dying in hotter seas. They lay eggs on beaches that are being covered by rising seas and more violent waves.
More uniquely（独特地）, their gender is determined not by genes but by the egg’s temperature during development. Small rises in beach temperatures can result in all-female populations, obviously problematic for survival. If the sand around the eggs hits 30 degrees Celsius, the gender balance shifts to female; at about 32 degrees they are all female. Above 34, you get boiled eggs.
On some nesting beaches, scientists are artificially cooling nests with shade or irrigation and trying to protect broader areas of coastal property from development to ensure that turtles have a place to nest as the seas rise. Why does the resort town stop promoting its turtle tourism?
| A．It decides not to disturb the turtles’ normal life. | |
| B．Tourists have lost interest in watching turtles. | |
| C．There are only very few turtles now. | D．The turtle museum was destroyed by a high tide. |
Which of the following is the major factor in the turtles’ endangerment?
| A．The locals’ eating habit. | B．Drift net fishing. | C．Beach development. | D．Global warming. |
The underlined word “gender” in Paragraph 5 means ____.
| A．the sex of turtles | B．the habit of turtles | C．the weight of turtles | D．the kind of turtles |
We learn from the last paragraph that scientists ____.
| A．are doing research on the sea rise | B．are moving turtles to new homes |
| C．are protecting turtles’ nests | D．are going rid of sea weeds |
The passage intends to ____.
| A．introduce a special kind of sea turtle | B．explain the mystery of turtles’ eggs |
| C．show the dangers a certain kind of sea turtle is facing | |
| D．attract more visitors to a sea turtle museum |
In 1995, Susan Boyle went to Glasgow to audition（试镜）for My Kind of People, a televised talent show popular in the UK. She was immediately rejected. She was nervous during the audition, and felt she didn’t perform well, but her brother said that she was rejected because of her plain looks. Susan was not discouraged and continued to sing at church and at the karaoke nights in a local pub.
Susan suffered a personal loss in 1997, when her father passed away. After his death, Susan put her big dreams on hold to care for her sick mother, Bridget Boyle. The mother and daughter often talked of Susan’s possible fame. Bridget Boyle encouraged her daughter to take part in singing competitions. “She was the one who said I should enter Britain’s Got Talent. We used to watch it together,” Susan later told reporters. “She thought I would win.”
In 1999, Susan used all of her savings to pay for a professional demo（样本唱片）tape, which she sent to record companies. In 2002, Susan began taking singing lessons from voice coach Fred O’Neil.
In 2007, her mother passed away at the age of 91. A neighbor reported that when Bridget Boyle died, her daughter “wouldn’t come out for three or four days or answer the door or phone”. She lived alone with her cat, Pebbles. For over a year, she refused to sing. But in August of 2008, O’Neil urged her to try out for Britain’s Got Talent. Convinced that the performance would be an honor to her mother, Susan auditioned in Glasgow, Scotland. She sang I Dreamed A Dream, a hit song from the musical Les Miserables（《悲惨世界》）, in the first round of the show, which was aired on April 11, 2009.
The 47-year-old Scottish woman's plain looks provided a sharp contrast（对比）to her powerfully beautiful voice. The performance astonished the audience and the judges. Online videos of her performance totaled over 40 million views within a week. Although she failed to win the final of Britain’s Got Talent, Susan Boyle became globally popular. Her first album I Dreamed A Dream has sold over five million copies. Bridget Boyle’s attitude towards her daughter’s musical talent can be described as ___.
| A．critical | B．doubtful | C．indifferent | D．confident |
From Paragraph 4, we can learn that Susan _____.
| A．was slightly discouraged by her voice coac | B．entered Britain’s Got Talent to prove her ability |
| C．decided to give up her singing career | D．was deeply affected by her mother’s death |
Which of the following is TRUE about Susan Boyle?
| A．Her international fame grew rapidly in 2008. | B．Her audition for My Kind of People failed. |
| C．She has never stopped singing since 1995. | D．She was the winner of Britain’s Got Talent. |
We can infer from the passage that ______.
| A．Susan Boyle was convinced by her brother that her plain looks were disadvantageous to her success |
| B．It was at the age of forty that Susan Boyle established a student-teacher relationship with O’Neil. |
| C．Susan Boyle was so struck by her father’s death that she shut herself out from the neighborhood. |
| D．The online views of Les Miserables numbered over 40 million within a week in 2009. |
In writing this passage, the author mainly intends to ______.
| A．tell us how Susan’s dream come true | B．let us know more about Susan’s personal life |
| C．show how Susan was influenced by her family | D．explain how to enter and win a talent show |
I took the bus to work for many years. No one knew each other; the passengers all sat there sleepily in the morning. The bus was cheerless and silent.
One of the passengers was a small grey man who took the bus to the center for senior citizens every morning. No one ever paid very much attention to him. One July morning he said good morning to the driver and smiled. The driver nodded guardedly. The rest of us were silent.
The next day, the old man boarded with a big smile and said in a loud voice, “A very good morning to you all!” Some of us looked up, amazed, and murmured “ good morning” in reply.
The following weeks, our friend was dressed in a nice old suit and tie. The thin hair had been carefully combed. He said good morning to us every day and we gradually began to nod and talk to each other.
One morning he even had a bunch of wild flowers in his hand. The driver turned around smilingly and asked, “Have you got yourself a girlfriend, Charlie?” We never got to know if his name really was “Charlie”, but he nodded shyly and said yes. The other passengers whistled and clapped at him. Charlie waved the flowers before he sat down on his seat.
Every morning after that Charlie always brought flowers. Some passengers also brought flowers for him. The bus became a happy place.
Then, one morning, as autumn was closing in, Charlie wasn’t waiting at his usual stop. When he wasn’t there the next day and the day after that, we started wondering if he was sick or hopefully---on holiday somewhere. When we came nearer to the center for senior citizens, one of the passengers even asked the driver to wait.
We all held our breaths when he went to the door. The old gentleman was fine, but one of his close friends had died over the weekend. How silent we were the rest of the way to work.
The next Monday Charlie was waiting at the stop, and without a tie. Inside the bus was silent. The story is mainly developed by ______.
| A．time | B．logic | C．comparison | D．cause and result |
Greeted with “good morning” from the old man, people aboard the bus at first _____.
| A．felt tired and sleepy and didn’t want to talk | B．greeted him back loudly and politely |
| C．guarded against the conversation from strangers | D．felt surprised and became angry with him. |
When the passengers found the old man was not waiting at the bus stop as usual, they did NOT _____.
| A．buy flowers and wait for him to come | B．feel anxious and worried about him |
| C．miss him and expect to see him | D．hope he was going on holiday rather than falling ill |
It can be inferred from the text that _____.
| A．the driver didn’t like the old man at first | B．people usually wear a tie when they are happy |
| C．passengers brought flowers to express gratitude（感激） to the old man | |
| D．the old man had a great influence on the passengers’ emotion |
The purpose of the passage is to _____.
| A．introduce the old gentleman and praise his good deeds |
| B．persuade us to become friendly and considerate to people around |
| C．tell us to keep silent when somebody passes away |
| D．criticize those who remain silent when they are greeted |