LONDON—Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is to send a few comets (彗星) in the direction of Earth, and its orbit (轨道)will be changed. Our world will then be sent moving into a safer older part of the solar system.
This idea for improving our climate comes from a group of US NASA (美国航空航天局) engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet—hopefully doubling its working life.
The plan put forward by Dr. Laughlin, and his colleagues Don Korycansky and Fred Adams, needs carefully directing a comet or asteroid (小行星) so that it passes close by our planet and sends some of its gravitational energy (重力势能) to Earth.
“Earth’s orbital speed would increase as a result and we would move to a higher orbit away from the sun,” Laughlin said.
Engineers would then direct their comet so that it passed close to Jupiter(木星) or Saturn (土星). The comet would pick up energy from one of these giant planets. Later its orbit would bring it back to Earth, and the process would be repeated.
In the short term, the plan provides an ideal way to worldwide warming, although the team was actually worried about a much greater danger. The sun is certain to heat up in about a billion years and so “seriously compromise” our biosphere (生物圈)—by cooking us.
That’s why the group decided to try to save Earth.
The plan has one or two worrying sides, however. For a start, space engineers would have to be very careful about how they directed their asteroid or comet towards Earth. The smallest miscalculation (误算)in orbit could fire it straight at Earth—with deadly results.
There is also the question of the moon. As the present issue of Scientific American magazine points out, if Earth was pushed out of its present location, it is “most likely the moon would be stripped (剥离)away from Earth,” it states. This would greatly change our planet’s climate.
1. What makes the scientists plan to move Earth?
A. A few comets are moving to the direction of Earth.
B. Earth’s working life is coming to an end soon.
C. Earth will become too hot for mankind to keep alive.
D. The moon is moving farther and farther away from Earth.
2. If the plan is successful, Earth will have a working life of ________ years.
A. 12 billion B. 6 billion
C. 18 billion D. 24 billion
3.What serious problems might the plan cause according to the passage?
A. The comet might hit Earth and man might lose the moon.
B. Earth might be moved too far away and man might die because of the coldness.
C. The comet might hit Jupiter or Saturn and never return to Earth.
D. Earth’s working life might be greatly shortened.
4.What does the underlined word “compromise” mean?
A.provide B. benefit (收益)
C. share D. Endanger
九年级英语阅读理解中等难度题
LONDON—Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is to send a few comets (彗星) in the direction of Earth, and its orbit (轨道)will be changed. Our world will then be sent moving into a safer older part of the solar system.
This idea for improving our climate comes from a group of US NASA (美国航空航天局) engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet—hopefully doubling its working life.
The plan put forward by Dr. Laughlin, and his colleagues Don Korycansky and Fred Adams, needs carefully directing a comet or asteroid (小行星) so that it passes close by our planet and sends some of its gravitational energy (重力势能) to Earth.
“Earth’s orbital speed would increase as a result and we would move to a higher orbit away from the sun,” Laughlin said.
Engineers would then direct their comet so that it passed close to Jupiter(木星) or Saturn (土星). The comet would pick up energy from one of these giant planets. Later its orbit would bring it back to Earth, and the process would be repeated.
In the short term, the plan provides an ideal way to worldwide warming, although the team was actually worried about a much greater danger. The sun is certain to heat up in about a billion years and so “seriously compromise” our biosphere (生物圈)—by cooking us.
That’s why the group decided to try to save Earth.
The plan has one or two worrying sides, however. For a start, space engineers would have to be very careful about how they directed their asteroid or comet towards Earth. The smallest miscalculation (误算)in orbit could fire it straight at Earth—with deadly results.
There is also the question of the moon. As the present issue of Scientific American magazine points out, if Earth was pushed out of its present location, it is “most likely the moon would be stripped (剥离)away from Earth,” it states. This would greatly change our planet’s climate.
1. What makes the scientists plan to move Earth?
A. A few comets are moving to the direction of Earth.
B. Earth’s working life is coming to an end soon.
C. Earth will become too hot for mankind to keep alive.
D. The moon is moving farther and farther away from Earth.
2. If the plan is successful, Earth will have a working life of ________ years.
A. 12 billion B. 6 billion
C. 18 billion D. 24 billion
3.What serious problems might the plan cause according to the passage?
A. The comet might hit Earth and man might lose the moon.
B. Earth might be moved too far away and man might die because of the coldness.
C. The comet might hit Jupiter or Saturn and never return to Earth.
D. Earth’s working life might be greatly shortened.
4.What does the underlined word “compromise” mean?
A.provide B. benefit (收益)
C. share D. Endanger
九年级英语阅读理解中等难度题查看答案及解析
LONDON—Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is to send a few comets (彗星) in the direction of Earth, and its orbit (轨道) will be changed. Our world will then be sent moving into a safer older part of the solar system.
This idea for improving our climate comes from a group of US NASA (美国航空航天局) engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet—hopefully doubling its working life.
The plan put forward by Dr. Laughlin, and his colleagues Don Korycansky and Fred Adams, needs carefully directing a comet or asteroid (小行星) so that it passes close by our planet and sends some of its gravitational energy (重力势能) to Earth.
“Earth’s orbital speed would increase as a result and we would move to a higher orbit away from the sun,” Laughlin said.
Engineers would then direct their comet so that it passed close to Jupiter (木星) or Saturn(土星). The comet would pick up energy from one of these giant planets. Later its orbit would bring it back to Earth, and the process would be repeated.
In the short term, the plan provides an ideal way to worldwide warming, although the team was actually worried about a much greater danger. The sun is certain to heat up in about a billion years and so “seriously compromise” our biosphere (生物圈)—by cooking us.
That’s why the group decided to try to save Earth.
The plan has one or two worrying sides, however. For a start, space engineers would have to be very careful about how they directed their asteroid or comet towards Earth. The smallest miscalculation (误算) in orbit could fire it straight at Earth—with deadly results.
There is also the question of the moon. As the present issue of Scientific American magazine points out, if Earth was pushed out of its present location, it is “most likely the moon would be stripped (剥离) away from Earth,” it states. This would greatly change our planet’s climate.
1.What makes the scientists plan to move Earth?
A. A few comets are moving to the direction of Earth.
B. Earth’s working life is coming to an end soon.
C. Earth will become too hot for mankind to keep alive.
D. The moon is moving farther and farther away from Earth.
2.If the plan is successful, Earth will have a working life of ________ years.
A. 12 billion B. 6 billion C. 18 billion D. 24 billion
3.What serious problems might the plan cause according to the passage?
A. The comet might hit Earth and man might lose the moon.
B. Earth might be moved too far away and man might die because of the coldness.
C. The comet might hit Jupiter or Saturn and never return to Earth.
D. Earth’s working life might be greatly shortened.
4.What does the underlined word “compromise” mean?
A. provide B. benefit (受益) C. share D. endanger
九年级英语阅读理解困难题查看答案及解析
阅读下列内容，从每小题所给的四个选项中选出一个最佳答案
LONDON—Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is to send a few comets (彗星) in the direction of Earth, and its orbit (轨道)will be changed. Our world will then be sent moving into a safer older part of the solar system.
This idea for improving our climate comes from a group of US NASA (美国航空航天局) engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet—hopefully doubling its working life.
The plan put forward by Dr. Laughlin, and his colleagues Don Korycansky and Fred Adams, needs carefully directing a comet or asteroid (小行星) so that it passes close by our planet and sends some of its gravitational energy (重力势能) to Earth.
“Earth’s orbital speed would increase as a result and we would move to a higher orbit away from the sun,” Laughlin said.
Engineers would then direct their comet so that it passed close to Jupiter(木星) or Saturn (土星). The comet would pick up energy from one of these giant planets. Later its orbit would bring it back to Earth, and the process would be repeated.
In the short term, the plan provides an ideal way to worldwide warming, although the team was actually worried about a much greater danger. The sun is certain to heat up in about a billion years and so “seriously compromise” our biosphere (生物圈)—by cooking us.
That’s why the group decided to try to save Earth.
The plan has one or two worrying sides, however. For a start, space engineers would have to be very careful about how they directed their asteroid or comet towards Earth. The smallest miscalculation (误算)in orbit could fire it straight at Earth—with deadly results.
There is also the question of the moon. As the present issue of Scientific American magazine points out, if Earth was pushed out of its present location, it is “most likely the moon would be stripped (剥离)away from Earth,” it states. This would greatly change our planet’s climate.
1.What makes the scientists plan to move Earth?
A. A few comets are moving to the direction of Earth.
B. Earth’s working life is coming to an end soon.
C. Earth will become too hot for mankind to keep alive.
D. The moon is moving farther and farther away from Earth.
2. If the plan is successful, Earth will have a working life of ________ years.
A. 12 billion B. 6 billion
C. 18 billion D. 24 billion
3.What serious problems might the plan cause according to the passage?
A. The comet might hit Earth and man might lose the moon.
B. Earth might be moved too far away and man might die because of the coldness.
C. The comet might hit Jupiter or Saturn and never return to Earth.
D. Earth’s working life might be greatly shortened.
4.What does the underlined word “compromise” mean?
A. provide B. benefit
C. share D. endanger
九年级英语阅读理解中等难度题查看答案及解析
—It is said that the scientists have found new ways to deal with AIDS.
—________wonderful news it is!
A．How B．What an C．How a D．What
九年级英语单项填空中等难度题查看答案及解析
Since the 1970s, scientists have been searching for ways to connect our brain with computers. Brain-Computer Interface (BCI) technology could help people with disabilities send commands(指令)to machines.
Recently two researchers, Jose Millan and Michele Tavella from the Federal Polytechnic School in Lausanne. Switzerland, showed us a small robotic wheelchair directed（指挥）by a person’s thoughts.
In the laboratory. Tavella operated the wheelchair just by thinking about moving his left or right hand “Our brain has billions of cells（细胞）. These send signals（信号）through the spinal cord（脊髓）to the muscles（肌肉）to give us the ability to move. But some injuries or other conditions can stop these weak electrical signals from reaching the muscles.” Tavella says. “Our system allows disabled people to communicate with outside world by controlling the machines with thoughts.”
The researchers designed a special cap for the user. It picks up the signals from our brain and sends them to a computer. The computer gets the signals and starts to command the wheelchair after a short while.
Prof. Millan, the team leader, says scientists keep improving the computer software that gets brain signals and turns them into simple commands. “The practical possibilities that BCI technology offers to disabled people can be grouped in two kinds: communication, and controlling machines. One example is this wheelchair.”
He says his team has set a main goal. That is to test with real patients, so as to prove that this is such a technology they can benefit（获益）from.
1.BCI is a technology that can __________.
A. help the disabled to be healthy again B. help to improve computers
C. control a person’s thoughts D. connect human brain with computers
2.Which of the following shows the right path（途径）of the signals described in Paragraph 4?
A. brain→computer→cap→wheelchair B. computer→cap→brain→wheelchair
C. cap→omputer→brain→wheelchair D. brain→cap→computer→wheelchair
3.Prof. Millan’s team will test their products with real patients to __________.
A. make them live longer B. prove that the technology is useful to them
C. learn about their physical conditions D. have a better understanding of computers
4.The best title of this passage might be __________.
A. Switzerland, the BCI Research Center
B. New Findings about How the Human Brain Works
C. BCI Could Mean More Freedom for the Disabled
D. BCI Could Help to Cure Brain Injuries
九年级英语阅读单选中等难度题查看答案及解析
Ted Brown's dream as a child was an unusual one: he wanted to fly. What was more unusual was the way in which he made his dream come true.
After high school, he wanted to join the U．S．Air Force but he failed because of his poor eyesight. However, his dream remained.
At the age of 33, Ted was a truck driver in Los Angeles. One day, while sitting outside in his garden, he watched planes fly overhead and an idea came to him: to use balloons（气球） to fly.
A few weeks later, Ted bought 42huge balloons. He tied them to a chair and then he sat down in the chair with some beer, sandwiches and a gun. His plan was to fly to 10meters above his garden, enjoy a few hours in the air, and then shoot some balloons with his gun to get back down. But things did not go as he planned.
Once his friends cut the ropes under Ted's chair, the 42balloons flew into the sky at an astonishing speed until about 4000meters above the ground with Ted and his chair. He didn't shoot any of the balloons because he was afraid he might break the balance（平衡） of his "plane". Ted stayed in the sky with his beer and sandwiches for 14hours，cold and frightened.
Planes heading towards Los Angeles' busy international airport reported the strange sight. And Ted's balloons caused great danger to them. At last, Ted gathered his courage to shoot a few balloons and slowly landed on the ground, where many policemen were waiting for him.
Ted made his dream come true, but it cost him: he was fined（罚款） 1,500 for breaking the law about air safety.
When asked by a reporter why he had done it, Ted answered, "A man can't just sit around and do nothing; he should have his dream and go for it."
1.Why couldn't Ted join the American Air Force？
A. Because he didn't finish high school．
B. Because his parents stopped him．
C. Because there was problem with his eyes．
D. Because he was too short
2.He was fined 1,500 because
A. his balloons caused trouble to planes
B. he stayed too long in the air
C. he used too many balloons
D. he took a gun with him
3.Which of the following is true？
A. He didn't go to college because of his dream to fly．
B. He felt sorry for what he had done．
C. He realized his dream in a dangerous way both to himself and to others．
D. He didn't shoot the balloons at first because he wanted to stay there longer．
4.What can be the best title for the story?
A. Go for It．
B. A Man with Poor Eyesight．
C. Up High in the Air．
D. Ted's Dream to Fly．
九年级英语阅读单选困难题查看答案及解析
Ted Brown's dream as a child was an unusual one: he wanted to fly. What was more unusual was the way in which he made his dream come true.
After high school, he wanted to join the U. S. Air Force but he failed because of his poor eyesight. However, his dream remained.
At the age of 33, Ted was a truck driver in Los Angeles. One day, while sitting outside in his garden, he watched planes fly overhead and an idea came to him: to use balloons(气球) to fly.
A few weeks later, Ted bought 42 huge balloons. He tied them to a chair and then he sat down in the chair with some beer, sandwiches and a gun. His plan was to fly to 10 meters above his garden, enjoy a few hours in the air, and then shoot some balloons with his gun to get back down. But things did not go as he planned.
Once his friends cut the ropes under Ted's chair, the 42 balloons flew into the sky at an astonishing speed until about 4000 meters above the ground with Ted and his chair. He didn't shoot any of the balloons because he was afraid he might break the balanee(平衡) of his "plane". Ted stayed in the sky with his beer and sandwiches for 14 hours, cold and frightened.
Planes heading towards Los Angeles' busy international airport reported the strange sight. And Ted' s balloons caused great danger to them. At last, Ted gathered his courage to shoot a few balloons and slowly landed on the ground, where many policemen were waiting for him.
Ted made his dream come true, but it cost him: he was fined(罚款) $ 1,500 for breaking the law about air safety.
When asked by a reporter why he had done it, Ted answered, "A man can't just sit around and do nothing; he should have his dream and go for it. "
1.Why couldn't Ted join the American Air Force?
A.Because he didn't finish high school.
B. Because his parents stopped him.
C. Because there was problem with his eyes.
D. Because he was too short.
2.He was fined $ 1,500 because
A.his balloons caused trouble to planes
B. he stayed too long in the air
C. he used too many balloons
D. he took a gun with him
3.Which of the following is true?
A. He didn't go to college because of his dream to fly.
B. He felt sorry for what he had done.
C. He realized his dream in a dangerous way both to himself and to others.
D. He didn't shoot the balloons at first because he wanted to stay there longer.
4.What can be the best title for the story?
A. Go for It. B. A Man with Poor Eyesight.
C. Up High in the Air. D. Ted's Dream to Fly.
九年级英语阅读理解中等难度题查看答案及解析
Scientists found that people need to stay outside for ______ two hours to have good eyesight.
A.at least B.at once C.at last
九年级英语单选题中等难度题查看答案及解析
There’s no pizza on Mars, but scientists have found a solution to this problem for hungry astronauts: a pizza printer! NASA, the American space agency, has developed a machine that “prints” food. They showed a model of the printer in Austin, Texas last month.
How does it work? Cartridges(墨盒) filled with powdered dough(面粉团), cheese, sauce, water and oil put the ingredients layer(层)by layer onto a printer bed. The printer bed, which gets hot from below, cooks the food as it’s being printed.
Since most of the ingredients are powdered, they can be sent into space and stored for many years without going bad. Water makes food go sour, so the food powders are mixed with water and oil only when they are being printed.
“Long-distance space travel requires more than 15 years of shelf life for food.” says Anjan Contractor, whose company developing the printer. “ We take water out, and in that form, food will last maybe 30 years.”
In outer space, there are far fewer choices for astronauts for dinner. Most of their foods—even things like beef or shrimp—are eaten from bags as powders（粉末）. Scientists hope the new food printer can be used to make more delicious food in outer space, keeping astronauts healthier and happier.
But the printer is not limited to use in outer space. Scientists think it could be useful on Earth, too. It could allow personal meals to be made at the dinner table, according to each person’s different needs.
“Let’s say someone is an athlete in the family, and he needs more protein(蛋白质),” says Anjan Contractor, founder of Systems and Materials Research Corp, the company developing the printer. “We can design recipes for him and print out more protein-nutritious food for him.”
1.In outer space, food can be stored for many years without going bad_______.
A．when it’s mixed with water
B．when it’s mixed with oil
C．when it’s powdered
D．when it’s put in the fridge
2.Which of the following is TRUE? ______
A．Astronauts eat beef powder in outer space.
B．A model of the food printer was shown in New York last month.
C．Only astronauts and athletes can eat the food from the printer.
D．The printer can only be used in outer space.
3.What is the best title for this passage? _______
A．Astronauts’ Life in Outer Space
B．Hungry? Just Print!
C．How to Make Pizza
D．Long Lasting Food
九年级英语阅读理解中等难度题查看答案及解析
There’s no pizza on Mars, but scientists have found a solution to this problem for hungry astronauts: a pizza printer! NASA, the American space agency, has developed a machine that “prints” food. They showed a model of the printer in Austin, Texas last month.
How does it work? Cartridges(墨盒) filled with powdered dough(面粉团), cheese, sauce, water and oil put the ingredients layer(层)by layer onto a printer bed. The printer bed, which gets hot from below, cooks the food as it’s being printed.
Since most of the ingredients are powdered, they can be sent into space and stored for many years without going bad. Water makes food go sour, so the food powders are mixed with water and oil only when they are being printed.
“Long-distance space travel requires more than 15 years of shelf life for food.” says Anjan Contractor, whose company developing the printer. “ We take water out, and in that form, food will last maybe 30 years.”
In outer space, there are far fewer choices for astronauts for dinner. Most of their foods—even things like beef or shrimp—are eaten from bags as powders（粉末）. Scientists hope the new food printer can be used to make more delicious food in outer space, keeping astronauts healthier and happier.
But the printer is not limited to use in outer space. Scientists think it could be useful on Earth, too. It could allow personal meals to be made at the dinner table, according to each person’s different needs.
“Let’s say someone is an athlete in the family, and he needs more protein(蛋白质),” says Anjan Contractor, founder of Systems and Materials Research Corp, the company developing the printer. “We can design recipes for him and print out more protein-nutritious food for him.”
1.In outer space, food can be stored for many years without going bad____.
A. when it’s mixed with water
B. when it’s mixed with oil
C. when it’s powdered
D. when it’s put in the fridge
2.Which of the following is TRUE? ______
A. Astronauts eat beef powder in outer space.
B. A model of the food printer was shown in New York last month.
C. Only astronauts and athletes can eat the food from the printer.
D. The printer can only be used in outer space.
3.What is the best title for this passage? _______
A. Astronauts’ Life in Outer Space
B. Hungry? Just Print!
C. How to Make Pizza
D. Long Lasting Food
九年级英语阅读理解中等难度题查看答案及解析