The idea that red means stop and green means has influenced our lives in more ways than just traffic signals(信号). We have been taught from a young age that the color red means danger and green means it's okay to move forward. But why were those colors chosen for traffic lights in the first place? For something we have to look at every day, why couldn't they have been prettier colors?
Well, it's import to know that before traffic lights for cars, there were traffic signals for trains. At first, railway companies used red to mean stop, white to mean go, and green to mean warn. As you could imagine, trains ran into a few problems with white meaning go. For example, one train mistook a bright star for a white light and something unexpected happened. Because of that, railway companies finally moved green meaning go and used yellow to mean warn. And it's been that way ever since.
Red has always been a color that mean danger, long before cars were even around. This most likely started because it's the color with the longest wavelength(波长) so it can be seen somewhere farther than other colors.
But, believe it or not, yellow was once used to mean stop. Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area. Finally, highly reflective materials(高反射材料) were developed and red stop signs were born. Since yellow can be seen well at all times of the day, school zones, some traffic signs, and school buses continue to be printed yellow.
So next time you are impatiently waiting at a traffic light, don't get so mad at them, they've certainly come a long way.
根据材料内容选择最佳答案。
1.What were traffic signals for before traffic lights for cars?
A.Trains B.Boats. C.Planes D.Bicycles
2.Which of the following colors meant go at first?
A.Red. B.Yellow. C.White. D.Green.
3.Why does red mean danger?
A.Because it's the brightest color. B.Because it can be seen far away.
C.Because railway companies say so. D.Because it has the shortest wavelength.
4.Why are school buses painted yellow?
A.Because yellow is a prettier color.
B.Because yellow once meat danger.
C.Because yellow can be seen well in daytime.
D.Because yellow means it's OK to go forward.
5.What does the text mainly tell us?
A.How important traffic lights are.
B.Which color has the longest wavelength.
C.What red, yellow and green can be used for.
D.Why traffic lights are red, yellow and green.
九年级英语阅读单选困难题
The idea that red means stop and green means has influenced our lives in more ways than just traffic signals(信号). We have been taught from a young age that the color red means danger and green means it's okay to move forward. But why were those colors chosen for traffic lights in the first place? For something we have to look at every day, why couldn't they have been prettier colors?
Well, it's import to know that before traffic lights for cars, there were traffic signals for trains. At first, railway companies used red to mean stop, white to mean go, and green to mean warn. As you could imagine, trains ran into a few problems with white meaning go. For example, one train mistook a bright star for a white light and something unexpected happened. Because of that, railway companies finally moved green meaning go and used yellow to mean warn. And it's been that way ever since.
Red has always been a color that mean danger, long before cars were even around. This most likely started because it's the color with the longest wavelength(波长) so it can be seen somewhere farther than other colors.
But, believe it or not, yellow was once used to mean stop. Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area. Finally, highly reflective materials(高反射材料) were developed and red stop signs were born. Since yellow can be seen well at all times of the day, school zones, some traffic signs, and school buses continue to be printed yellow.
So next time you are impatiently waiting at a traffic light, don't get so mad at them, they've certainly come a long way.
根据材料内容选择最佳答案。
1.What were traffic signals for before traffic lights for cars?
A.Trains B.Boats. C.Planes D.Bicycles
2.Which of the following colors meant go at first?
A.Red. B.Yellow. C.White. D.Green.
3.Why does red mean danger?
A.Because it's the brightest color. B.Because it can be seen far away.
C.Because railway companies say so. D.Because it has the shortest wavelength.
4.Why are school buses painted yellow?
A.Because yellow is a prettier color.
B.Because yellow once meat danger.
C.Because yellow can be seen well in daytime.
D.Because yellow means it's OK to go forward.
5.What does the text mainly tell us?
A.How important traffic lights are.
B.Which color has the longest wavelength.
C.What red, yellow and green can be used for.
D.Why traffic lights are red, yellow and green.
九年级英语阅读单选困难题查看答案及解析
The idea that red means stop and green means has influenced our lives in more ways than just traffic signals(信号). We have been taught from a young age that the color red means danger and green means it's okay to move forward. But why were those colors chosen for traffic lights in the first place? For something we have to look at every day, why couldn't they have been prettier colors?
Well, it's import to know that before traffic lights for cars, there were traffic signals for trains. At first, railway companies used red to mean stop, white to mean go, and green to mean warn. As you could imagine, trains ran into a few problems with white meaning go. For example, one train mistook a bright star for a white light and something unexpected happened. Because of that, railway companies finally moved green meaning go and used yellow to mean warn. And it's been that way ever since.
Red has always been a color that mean danger, long before cars were even around. This most likely started because it's the color with the longest wavelength(波长) so it can be seen somewhere farther than other colors.
But, believe it or not, yellow was once used to mean stop. Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area. Finally, highly reflective materials(高反射材料) were developed and red stop signs were born. Since yellow can be seen well at all times of the day, school zones, some traffic signs, and school buses continue to be printed yellow.
So next time you are impatiently waiting at a traffic light, don't get so mad at them, they've certainly come a long way.
根据材料内容选择最佳答案。
1.What were traffic signals for before traffic lights for cars?
A. Trains B. Boats. C. Planes D. Bicycles
2.Which of the following colors meant go at first?
A. Red. B. Yellow. C. White. D. Green.
3.Why does red mean danger?
A. Because it's the brightest color. B. Because it can be seen far away.
C. Because railway companies say so. D. Because it has the shortest wavelength.
4.Why are school buses painted yellow?
A. Because yellow is a prettier color.
B. Because yellow once meat danger.
C. Because yellow can be seen well in daytime.
D. Because yellow means it's OK to go forward.
5.What does the text mainly tell us?
A. How important traffic lights are.
B. Which color has the longest wavelength.
C. What red, yellow and green can be used for.
D. Why traffic lights are red, yellow and green.
九年级英语阅读单选困难题查看答案及解析
阅读下面的短文,根据短文内容回答问题。
The idea that red means stop and green means go has influenced our lives in more ways than just traffic signals (信号). We have been taught from a young age that the color red means danger and green means it’s okay to move forward. But why were those colors chosen for traffic lights in the first place? For something we have to look at every day, why couldn’t they have been prettier colors?
Well, it’s important to know that before traffic lights for cars, there were traffic signals for trains. At first, railway companies used red to mean stop, white to mean go, and green to mean warn. As you could imagine, trains ran into a few problems with white meaning go. For example, one train mistook a bright star for a white light and something unexpected happened. Because of that, railway companies finally moved green meaning go and used yellow to mean warn. And it’s been that way ever since.
Red has always been a color that mean danger, long before cars were even around. This most likely started because it’s the color with the longest wavelength (波长) so it can be seen somewhere farther than other colors.
But, believe it or not, yellow was once used to mean stop. Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area. Finally, highly reflective materials (高反射材料) were developed and red stop signs were born. Since yellow can be seen well at all times of the day, school zones, some traffic signs, and school buses continue to be printed yellow.
So next time you are impatiently waiting at a traffic light, don’t get so mad at them, they’ve certainly come a long way.
Answer the following question with no more than 8 words.
1.How many colours have been used for traffic signals since the very beginning?
2.What did one train mistake for a white light?
3.Did the colour yellow mean go at first?
4.Why does red mean danger?
5.When were stop signs yellow?
九年级英语回答问题中等难度题查看答案及解析
The "green" car has become popular in recent years. It means that a car is environmentally friendly.
Today, most cars are powered by petrol(汽油). They make our lives easier. Two of the biggest problems are noise pollution and air pollution.
With the world’s population(人口) growing quickly, we have to think of ways to make cars that are better for the environment. One day, maybe you can help invent a clean car that makes people, animals, and plants happy! There are a few new types of cars that do not use petrol. We are still learning to make these cars better.
Electric cars: An electric car uses a battery(电池) for its power. When you are not driving it, just plug it in like a mobile phone to give the battery more power. Some electric cars are much cleaner than petrol cars.
Fuel cell(燃料电池) cars: Car makers are now learning about how fuel cells can be used to power cars. Fuel cells use hydrogen(氢气) and oxygen(氧气) to make power. The only waste gas they produce is clean water.
Solar(太阳能) cars: A solar car has large panels(嵌板) on its top that get power from the sunlight. The car holds that power in a battery. Solar cars might be the cleanest of all. But no one uses them, because solar panels can’t get enough power from the sun to make a car go for a long time. Also, they are very slow.
The "Green" Car Has Become Popular
Petrol cars | Petrol cars make our lives 1., but they have also caused 2. pollution and 3. pollution. |
Electric cars | Electric cars use 4. for their power. They are much 5. than petrol cars. |
Fuel cell cars | Fuel cells use hydrogen and 6. to make power. |
Solar cars | Solar cars have large panels on their top that get power from the 7.. Solar cars might be the 8. of all. But solar panels can’t get 9. power from the sun to make cars 10. for a long time. |
九年级英语填空中等难度题查看答案及解析
The child has many colourful kites:red, yellow, blue, green .
A.and on B.and so on C.so on D.and so
九年级英语单选题简单题查看答案及解析
We are living in a colourful world with green trees, red flowers and the blue sky. Everything has its colour. Our moods also have different colours.
I am a middle school student. Yesterday, I didn’t want to get up early for school, but I was woken up by mum at 6:00 a.m. At that time my mood was like grey fog. I felt tired and sleepy.
At noon, I helped a blind man cross the road on my way home. The blind man thanked me a lot. I felt very happy and the mood was like the red sun. It made me warm and sweet.
In the maths class, my red mood changed to black, because I failed the exam. When I got the exam paper, I couldn’t stop crying. But Mr Li told me to keep on studying hard.
After school, I walked home and thought about Mr Li’s words. I felt comfortable and energetic. The mood was like the blue sky, sunny and peaceful.
九年级英语其他题中等难度题查看答案及解析
Teachers say that the digital(数字) age has had a good influence and a not-so-good influence on American teenagers. More than 2,000 middle and high school teachers took an online survey. Researchers also spoke with teachers in some groups. Most teachers think the Internet and digital search tools have had a mostly positive influence on their students' research habits and skills. But at the same time,some teachers also point out some problems in teenagers' using digital search tools.
The Pew Internet Project did the survey with the College Board and the National Writing Project. Judy Buchanan is the director of the National Writing Project and a co-writer of the report. She says digital research tools are helping students learn more, and learn faster. "Both teachers and students really welcome these tools because they make learning exciting. And the goal is to really help students become creators of something meaningful, and not just users of the online information.”
But one problem the survey found is that these technologies make teenagers have short attention spans(持续时间). As there is huge amount of information about different subjects on the Internet, teenagers' attention is easily drawn away from their research.
Another problem the survey found is that many students trust the information they find on the Internet too much. Judy Buchanan says these students have not developed the skills to judge the online information. They need to learn a lot to tell if the information is believable. It's something that really has to be paid attention to.
One more problem the survey found is something that might not seem like a problem at all: being able to quickly find information online. Many students think "doing research" now means just doing a quick search on Google. Teachers say the result is a drop in the wish and ability of their students to work hard to find answers. That is, they are overly dependent on search engines and do not make enough use of printed books or research librarians.
Many teachers also say that the Internet makes it easy for students to copy work done by others instead of using their own abilities.
1.The result of the survey shows .
A.digital search tools need to be greatly improved
B.digital search tools are generally good for teenagers
C.teenagers have difficulty in using digital search tools
D.American teachers enjoy using digital search tools
2.Using digital search tools makes teenagers .
A.less trusting of online information B.more independent in doing research
C.more willing to work hard to find answers D.less able to pay full attention while searching
3.To do better in research, teenagers should .
A.spend more time searching online B.ask their teachers for more advice
C.make better use of printed materials D.learn more knowledge of search tools
九年级英语阅读单选中等难度题查看答案及解析
—Look! The traffic lights turn _______.
—We should stop.
A. blue B. yellow C. red D. green
九年级英语单选题中等难度题查看答案及解析
Usually, it is known that nodding the head means “Yes”, and shaking the head has the opposite (相反的) meaning. But some people will probably be puzzled when they first come to India. When they talk to an Indian, he often shakes his head. They might think that the Indian does not like what he said, but on the contrary he is expressing agreement.
The Indians have a habit of shaking their heads slightly when they talk to somebody. It doesn’t mean “No”, but “Yes”. If a person doesn’t know this, it might cause misunderstanding. At one time a foreigner in Indian told his driver who was an Indian to take him to his office. The driver shook his head. The foreigner repeated his request and the driver shook his head again. At last, the foreigner shouted angrily, “Drive me to my office at once!” The driver said in a low voice, “Yes, sir,” smiling and shaking his head again at the same time.
1.Generally speaking, nodding the head means ________, and shaking the head means________ .
A.Yes; Yes B.No; Yes C.Yes; No D.No; No
2.Why did the foreigner become angry? Because ________ .
A.the Indian driver didn’t want to send him to his office
B.he misunderstood the meaning of shaking the head in India
C.he asked the driver to send him to his office, but the Indian driver didn’t say any words
D.the Indian driver asked him for a lot of money
3.What is the passage mainly about ?
A.Cultural misunderstanding. B.An Indian driver. C.A foreigner in Indian. D.Nodding the head.
九年级英语阅读单选简单题查看答案及解析
Today, roller skating is easy and fun. But before 1750, no one has the idea of skating. That changed because of a man named Joseph Merlin. Merlin's work was making musical instruments.
One day Merlin received an invitation to attend a music party. He was very pleased and a little excited. As the day of the party came near, Merlin began to think how to make a grand entrance(入场) at the party. He had an idea. He thought he would get a lot of attention if he could skate into the room.
Merlin tried different ways to make himself roll. Finally, he decided to put two wheels under each shoe. These were the first roller skates in the world. Merlin was very proud of his invention and dreamed of arriving at the party on wheels while playing the violin.
On the night of the party Merlin rolled into the room playing the violin. Everybody was surprised to see him. There was just one problem. Merlin had no way to stop his roller skates. He rolled on and on, suddenly, he ran into a huge mirror that was hanging on the wall. Down fell the mirror, breaking into pieces. Nobody forgot Merlin's entrance.
1.The idea of roller skating didn't exist _________.
A. until 1750 B. after 1750 C. since 1750 D. from 1750
2.Merlin didn't _______ at the party.
A. play the violin
B. have any ways to stop his roller skates
C. roll into the room
D. get a lot of attention
3.Merlin stopped rolling when_________.
A. he wanted to stop B. he ran into the mirror
C. he ran to the window D. he knocked somebody
4.Which word would you use to describe Merlin's feeling after he stopped? ________
A. Proud B. Surprised C. Pleased D. Upset
5.Which is the best title of the passage? ___________
A. How to use the roller skates
B. How to make musical instruments
C. Merlin and the first violin
D. Merlin and the first roller skates
九年级英语阅读单选简单题查看答案及解析