题目列表(包括答案和解析)
Scientists from South Korea are trying to convert（转化）sound waves into electricity. The research could lead to charging a cell phone from a conversation or providing energy to the nation’s electricity system generated（产生）by the noise during rash-hour traffic.
“Just as speakers transform electrical signals into sound, the opposite process —turning sound into a source of electrical power — is possible,” said Young Jun Park and Sang-Woo Kim, the joint authors of a new article in the journal Advanced Materials.
Harvesting energy from phone calls and passing cars is based on materials known as piezoelectrics. When bent, piezoelectric materials turn that mechanical energy into electricity. Lots of materials are piezoelectric: cane sugar, quartz （石英）and even dried bone which could create an electrical charge when stressed. For decades, scientists have pumped electricity into piezoelectric materials for use in environmental sensors, speakers and other devices.
Over the past few years, however, scientists have made dramatic advances in getting electricity out of piezoelectric devices. In an experiment, by using sound waves, which at 100 decibels（分贝）were not quite as loud as a rock concert （a normal conversation is about 60-70 decibels）, the South Korean scientists produced a mild electrical current of about 50 millivolts（毫伏）. The average cell phone requires a few volts to function, several times the power this technology can currently produce.
“But the real question is whether there is enough surrounding noise to act as a power source as for a cell phone,” said McAlpine, a leading scientist. A consumer probably wouldn’t want to attend a rock concert or stand next to a passing train to charge his cell phone. The South Korean scientists agree but they expect to get a higher power output as they continue their work.
1.According to the two South Korean scientists, ________.
A．sound waves can travel faster than electricity
B．new materials can send cell phone signals better
C．using cell phones adds to heavy traffic in rush hour
D．electricity and sound can be transformed into each other
2.We know from the passage that piezoelectric materials ________.
A．can produce electricity when stressed
B．are good at changing electricity into sound
C．can reduce the noise of passing cars
D．have been widely used in phones and cars
3.It can be inferred from the South Korean scientists’ experiment that ________.
A．it is hard to change sound into electricity under current conditions
B．it is impossible to make use of loud sound
C．the technology has a long way to go to have a practical use
D．the technology can power cell phones easily
4.What McAlpine doubts about the technology is ________.
A．the noise pollution B．the sound resource
C．the cost of piezoelectrics D．the safety of devices
With its budget of $80 million , John Woo as director, and an all-star cast（明星云集的演员阵容）, Red Cliff is the most expensive and ambitious Asian-financed film ever. Last week I saw the release of the second part, and boy oh boy does it shows.
But watching the film as a foreigner I felt I was missing out on something. Not knowing my Cao Cao's from my Zhou Yu's, I was not even sure whom I wanted to win. Certainly after the opening scene, in which Cao Cao is seen watching a game of Cuju, an ancient Chinese variation of football, I knew who had my support. After all, any man who enjoys his football is someone after my own heart. But after Cao Cao resorted to some evil strategies against his enemies in the south, I wasn't so sure he was the man I should be rooting for.
And there is a lot more to Red Cliff 2 than just extravagant battle scenes. The film does not take itself too seriously. Conversations between leaders are littered with one-liners, many of which had the audience in laughter. There is even enough to keep fans of more romantic entertainment happy too. This includes a charming relationship between a southern spy（侦探）and an innocent northern soldier. The characters' interaction provides some genuinely heart-warming moments in the middle of the battle.
Clocking in at（结束于）around two hours, the film certainly does justice to the history story. When I walked out the cinema, I felt as drained（精疲力竭） as Cao Cao's soldiers must have 1,800 years ago.
By expressing “boy oh boy” in the first paragraph, the author seems to show that _______.
A．the film characters are like boys who are childish.
B．the film provides amazing and surprising scenes for audience.
C．the film is suitable for younger boys to watch.
D．the film scene is so bloody that boys shouldn’t watch it.
When did the author change his attitude toward Cao Cao?
A．When he read the history story about Cao Cao.
B．When he saw Cao Cao was watching a game of Cuju,
C．When he realized that Cao Cao took some bad measures to beat his enemies.
D．When he saw the romantic love story of Cao Cao and a southern spy.
The following factors of the film are all mentioned in the passage except_______.
A．high budget B．leading roles C．actors and actress D．conversations
From the passage we can infer that_______.
A．the author is a football fan in a foreign country.
B．Cuju is the name of an ancient Chinese variation of football.
C．the film Red Cliff 2 lasts about two hours.
D．the author was very tired after about two hours’ battle.
The researchers, led by Hwang Woo-suk, insist they cloned an Afghan hound, only to help investigate (研究) human disease, including the possibility of cloning stem cells (干细胞) for treatment purposes.
But others immediately renewed calls for a global ban (禁令)on human reproductive cloning before the technology moves any farther.
"Successful cloning of an increasing number of species confirms the general impression that it would be possible to clone any species of mammals, including humans," said Ian Wilmut, a reproductive biologist at the University of Edinburgh who produced the first cloned mammal, Dolly the sheep, from an adult cell nearly a decade ago.
Researchers have since cloned cats, goats, cows, mice, pigs, rabbits, horses, deer, mules and gaur, a large wild ox of Southeast Asia. So far, efforts to clone a monkey or another primate with the same techniques have failed.
Uncertainties about the health and life span (寿命) of cloned animals continue to exist; Dolly died at a young age in 2003 after developing cancer and arthritis.
Wilmut and others complimented Hwang's achievement, reported Wednesday in the journal Nature. But they said politicians and scientists must face the larger issue — how to go on with the research without crossing the moral boundary of copying human life in the lab.
"The ability to use the technology is hopeful," said Robert Schenken, president of the American Society for Reproductive Medicine. "However, the paper also points out that in dogs as in most species, cloning for reproductive purposes is unsafe."
The cloned puppy was the lone success from more than 100 dogs implanted (嵌入)with more than 1,000 cloned embryos.
In a news conference in Seoul, the cloning team also condemned(谴责)the reproductive cloning of humans as "unsafe and inefficient." Human reproductive cloning already is banned in South Korea. Other nations, including the United States, are divided on whether to ban just human cloning or cloning of all kinds, including the production of stem cells.
56. An Afghan hound is a kind of ______.
A. cat B. goat c. cow D. dog
57. A ______ is a large wild ox of Southeast Asia.
A. horse B. deer C. mules D. gaur
58. Accrding to the passage, scientists haven’t been able to clone a ______ so far.
A. deer B. mule C. mouse D. monkey
59. The underlined word complimented is probably similar in meaning to ______.
A. praised B. doubted C. refused D. gave up
60. The cloning of human beings is banned in ______.
A. South Korea B. the United States
C. both South Korea and the United States D. neither South Korea nor the United States
With its budget of $80 million , John Woo as director, and an all-star cast（明星云集的演员阵容）, Red Cliff is the most expensive and ambitious Asian-financed film ever. Last week I saw the release of the second part, and boy oh boy does it shows.
But watching the film as a foreigner I felt I was missing out on something. Not knowing my Cao Cao’s from my Zhou Yu’s, I was not even sure whom I wanted to win. Certainly after the opening scene, in which Cao Cao is seen watching a game of Cuju, an ancient Chinese variation of football, I knew who had my support. After all, any man who enjoys his football is someone after my own heart. But after Cao Cao resorted to some evil strategies against his enemies in the south, I wasn’t so sure he was the man I should be rooting for.
And there is a lot more to Red Cliff 2 than just extravagant battle scenes. The film does not take itself too seriously. Conversations between leaders are littered with one-liners, many of which had the audience in laughter. There is even enough to keep fans of more romantic entertainment happy too. This includes a charming relationship between a southern spy（侦探）and an innocent northern soldier. The characters’ interaction provides some genuinely heart-warming moments in the middle of the battle.
Clocking in at（结束于）around two hours, the film certainly does justice to the history story. When I walked out the cinema, I felt as drained（精疲力竭） as Cao Cao’s soldiers must have 1,800 years ago.
【小题1】By expressing “boy oh boy” in the first paragraph, the author seems to show that _______.
| A．the film characters are like boys who are childish. |
| B．the film provides amazing and surprising scenes for audience. |
| C．the film is suitable for younger boys to watch. |
| D．the film scene is so bloody that boys shouldn’t watch it. |
| A．When he read the history story about Cao Cao. |
| B．When he saw Cao Cao was watching a game of Cuju, |
| C．When he realized that Cao Cao took some bad measures to beat his enemies. |
| D．When he saw the romantic love story of Cao Cao and a southern spy. |
| A．high budget | B．leading roles | C．actors and actress | D．conversations |
| A．the author is a football fan in a foreign country. |
| B．Cuju is the name of an ancient Chinese variation of football. |
| C．the film Red Cliff 2 lasts about two hours. |
| D．the author was very tired after about two hours’ battle. |
Scientists from South Korea are trying to convert（转化）sound waves into electricity. The research could lead to charging a cell phone from a conversation or providing energy to the nation’s electricity system generated（产生）by the noise during rash-hour traffic.
“Just as speakers transform electrical signals into sound, the opposite process —turning sound into a source of electrical power — is possible,” said Young Jun Park and Sang-Woo Kim, the joint authors of a new article in the journal Advanced Materials.
Harvesting energy from phone calls and passing cars is based on materials known as piezoelectrics. When bent, piezoelectric materials turn that mechanical energy into electricity. Lots of materials are piezoelectric: cane sugar, quartz （石英）and even dried bone which could create an electrical charge when stressed. For decades, scientists have pumped electricity into piezoelectric materials for use in environmental sensors, speakers and other devices.
Over the past few years, however, scientists have made dramatic advances in getting electricity out of piezoelectric devices. In an experiment, by using sound waves, which at 100 decibels（分贝）were not quite as loud as a rock concert （a normal conversation is about 60-70 decibels）, the South Korean scientists produced a mild electrical current of about 50 millivolts（毫伏）. The average cell phone requires a few volts to function, several times the power this technology can currently produce.
“But the real question is whether there is enough surrounding noise to act as a power source as for a cell phone,” said McAlpine, a leading scientist. A consumer probably wouldn’t want to attend a rock concert or stand next to a passing train to charge his cell phone. The South Korean scientists agree but they expect to get a higher power output as they continue their work.
【小题1】According to the two South Korean scientists, ________.
| A．sound waves can travel faster than electricity |
| B．new materials can send cell phone signals better |
| C．using cell phones adds to heavy traffic in rush hour |
| D．electricity and sound can be transformed into each other |
| A．can produce electricity when stressed |
| B．are good at changing electricity into sound |
| C．can reduce the noise of passing cars |
| D．have been widely used in phones and cars |
| A．it is hard to change sound into electricity under current conditions |
| B．it is impossible to make use of loud sound |
| C．the technology has a long way to go to have a practical use |
| D．the technology can power cell phones easily |
| A．the noise pollution | B．the sound resource |
| C．the cost of piezoelectrics | D．the safety of devices |
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