网址：http://m.1010jiajiao.com/timu_id_878877[举报]
If we are driving a car or crossing a street, we will stop when the traffic lights turn red. Why do we use red rather than other colors?
As we know, scattering (散射) happens when light goes through the air. For the same media, if the wavelength (波长) is long, the scattering will be short. If the wavelength is short, then the scattering will be long.
Of all light we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days.
Using the red light can help drivers in farther areas see the lights. It helps drivers slow down or stop in time. If drivers don’t see the red light until they are close, they may not be able to stop the car in time. An accident may happen. Red can also excite people. We can act more quickly when we see the color red.
In a word, red light helps drivers stop in time and help prevent accidents.
1.______ has the longest wavelength of all light we can see.
A. Red B. Green C. Yellow D. Black
2.Red light travels farther on ______ days.
A. windy B. sunny C. rainy D. cloudy
3.Red can make people act more quickly because ____________.
A. red can make people happier B. the scattering of red is very short
C. the scattering of red is very long D. red can make people more excited
4.The underlined word “prevent” means ______ in Chinese.
A.逃避 B. 防止 C. 处理 D. 检查
5.The passage mainly tells us ____________.
A. why accidents happen B. how the red light travels
C. why we use red traffic lights D. how to stop in time at traffic lights
查看习题详情和答案>>
|
Family member |
What does he/she look like? |
|
My father |
My father is very tall. He has curly hair. He’s handsome. |
|
My mother |
My mother is not beautiful. She is short. She is only 1.5 meters. She has black hair. And she is fat. |
|
My sister |
My sister is a lovely girl. She has long curly hair. She’s of medium build. |
|
My brother |
My brother looks like my mother. He is short, too. He is very heavy. |
1.What does the writer’s father look like?
A．He is very short. B．He is short and has black hair.
C．He’s of medium build. D．He is tall and has curly hair.
2.Who is short and heavy?
A．The writer’s mother and brother. B．The writer’s mother and father.
C．The writer’s father and sister. D．The writer’s father and brother.
3.What does the writer look like?
A．He is handsome. B．He is heavy and tall .
C．He has long curly hair. D．We don’t know.
4.According to the passage, which is right?
A．There are four people in the writer’s family.
B．The writer’s mother is a beautiful woman.
C．The writer’s father and sister have curly hair.
D．The writer’s brother looks like his sister.
查看习题详情和答案>>
My sister and I are very different. When people meet us both, they are always surprised to learn that we are sisters. This is because we don’t look like each other, and we have different personalities(性格).
Are you similar to your brother or sister? My sister and I aren’t? similar to each other at all. I am tall, but she is very short. I have short dark brown hair and green eyes. She has long blond hair and blue eyes. I am strong, but she is not. I have big hands and feet; her feet and hands are very small. When we are kids, she was thin, but I was heavy. Now we’re both heavy.
We also have opposite personalities. She is always shy. I am more outgoing. She is very worried about what other people think and say about her, but I really don’t care. When she has a problem, she just worries about it, but when I have a problem, I try to fix it. She easily gets angry, especially with our mother. But I am more patient.?
1.When people meet the writer and her sister, they are always surprised to learn??????????
2.The writer and her sister are different in ??????????????????? ways.
3.The writer’s sister has?????????????????????? hair.
4.The writer’s sister is very worried about???????????? about her.
5.Do the write and her sister have the same personalities? ????????????
6.Find the topic sentence of the passage and copy it down. （找出文章的主题句并抄写下来）
7.Translate the underlined sentence into Chinese. （将划线的句子翻译成中文）
8.The underlined word “heavy” in the passage means “???????????????? ”in English.
查看习题详情和答案>>
| Family member | What does he/she look like? |
| My father | My father is very tall. He has curly hair. He’s handsome. |
| My mother | My mother is not beautiful. She is short. She is only 1.5 meters. She has black hair. And she is fat. |
| My sister | My sister is a lovely girl. She has long curly hair. She’s of medium build. |
| My brother | My brother looks like my mother. He is short, too. He is very heavy. |
【小题1】What does the writer’s father look like?
| A．He is very short. | B．He is short and has black hair. |
| C．He’s of medium build. | D．He is tall and has curly hair. |
| A．The writer’s mother and brother. | B．The writer’s mother and father. |
| C．The writer’s father and sister. | D．The writer’s father and brother. |
| A．He is handsome. | B．He is heavy and tall . |
| C．He has long curly hair. | D．We don’t know. |
| A．There are four people in the writer’s family. |
| B．The writer’s mother is a beautiful woman. |
| C．The writer’s father and sister have curly hair. |
| D．The writer’s brother looks like his sister. |