精英家教網 > 初中英語 > 題目詳情
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 (波長) 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.
【小題1】______ has the longest wavelength of all light we can see.
A．RedB．GreenC．YellowD．Black
【小題2】Red light travels farther on ______ days.
A．windyB．sunnyC．rainyD．cloudy
【小題3】Red can make people act more quickly because ____________.
A．red can make people happierB．the scattering of red is very short
C．the scattering of red is very longD．red can make people more excited
【小題4】The underlined word “prevent” means ______ in Chinese.
A．逃避B．防止C．處理D．檢查
【小題5】The passage mainly tells us ____________.
A．why accidents happenB．how the red light travels
C．why we use red traffic lightsD．how to stop in time at traffic lights

【小題1】A
【小題1】C
【小題1】D
【小題1】B
【小題1】C解析:
略
練習冊系列答案
相關習題

科目：初中英語 來源：2011年秋湖北省黃岡市浠水縣清泉鎮(zhèn)中九年級第一次月考英語卷 題型：閱讀理解

A famous teacher was speaking to the students at our school. He began his lesson by holding up a ￥100 bill. Then he said to the three hundred students， “Who would like this ￥100 bill？” The students began to put up their hands at once.
Then he said， “I am going to give this ￥100 to one of you， but first， let me do this.” He then made the bill into a ball. Then he said， “Who wants it now？” The hands went back into the air.
“Well，” he said， “What if I do this？” and he dropped it on the floor and stepped on it. He picked up the dirty， crumpled bill and said， “Who still wants it？” Hands went back into the air.
“My friends，” he said， “you have learned a valua-ble lesson today. No matter  what I did to the money， you still wanted it because it did not go down in value （價值）。 It was still worth ￥ l00！”
Many times in our lives， we are dropped， crum-pled， and stepped on by the chances we take and the things that happen to us. We feel as if we are worth nothing. But remember， no matter what has happened to you， you will never lose your value： you are always valuable to those people who love you. Your value doesn‘t come from what you do or whom you know， but WHO YOU ARE.
You are special and valuable. Don‘t ever forget it！
【小題1】Even though it was dirty， the money _______.

A．still went up in valueB．was worth nothing
C．didn‘t go down in valueD．was still ours
【小題2】We are always valuable to the people _______.
A．who pay usB．who call us
C．who hate usD．who love us
【小題3】The sentence “Hands went back into the air” means “_______”。
A．the students put up their hands again
B．the students put down their hands
C．the students put their hands behind their backs again
D．the students put their hands in front of them
【小題4】 Why did the famous teacher use a ￥100 bill at his lesson？
A．Because he wanted to make the bill into a ball.
B．Because he used to drop a bill on the floor and stepped on it.
C．Because he was going to give the bill to one of his students.
D．Because he wanted to make the students know what value was.

查看答案和解析>>

科目：初中英語 來源：2013屆福建福州延安中學初三中考模擬（二）英語卷（帶解析） 題型：寫作題

提示作文。(12分)
每年中學生意外傷害或者死亡事故頻發(fā)，給許多家庭帶來永久的傷痛。作為中學生，我們要如何有效地自我保護，免受傷害？請以“How to keep safe”為題，寫一篇80字左右的短文,開頭已給出，不計入字數(shù)。除了所給的以下四個要點要寫上，還要補充1-2點個人建議。
要點如下：1. 遵守交通規(guī)則，不闖紅燈，不騎電動車(electric bicycles)。
2. 不到河里游泳，要在成年人(adult)陪伴下到游泳池游泳。
3. 要在父母允許后才能和朋友外出。
4. 在學校和同學友好相處，不爭吵、不打架，有事情向老師求助。
Do you know that many dangerous things will happen if we are not careful enough? As a student, how to keep safe is very important. _________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
________________________________________

查看答案和解析>>

科目：初中英語 來源：2013屆河南省安陽市龍安區(qū)九年級上學期第三次月考英語試卷（帶解析） 題型：選詞填空

閱讀短文，從方框中選擇行當?shù)脑~并用其正確形式填空，使短文意思通順、完整。請將答案寫在短文后相應題號的橫線上。每空限填一詞，每詞限用一次。方框中有兩個詞是多余的。

dirty   with  have   always   time   they  large   want  speak  lesson  first  drop
After a quick breakfast, I went into the lecture hall in a hurry．A famous teacher was 【小題1】 to the students．He was holding up a $100 bill．Then he said to the three hundred students，“Who would like this $1 00 bill?” The students put up 【小題2】hands at once．Then he said，“I am going to give this $100 bill to one of you，but 【小題3】，let me do this．”He made the bill into a ball．Then he said. “Who【小題4】 it now?” The hands went back into the air．“Well,” he said，“what if I do this?” and he 【小題5】 it on the floor and stepped on it．He picked up the 【小題6】bill and said．“Who still wants it?” Hands went back again into the air．
“My friends,” he said，“you have learned a valuable(有價值的)【小題7】 today．No matter what I did to the $100 bill! Many  【小題8】 in our life，we are dropped and stepped on．We feel as if we are worth nothing．But remember, no matter what 【小題9】  happened to you，you will never lose your value：You are 【小題10】 valuable to those people who love you．Your value doesn’t come from what you do or whom you know, but who you are．’’

查看答案和解析>>

科目：初中英語 來源：2012-2013學年浙江省杭州市九年級12月月考英語試卷（解析版） 題型：完型填空

完形填空（共15小題，計15分）

通讀下面短文，掌握其大意，然后在各題所給的四個選項(A、B、C和D)中選出一個最佳選項。

Each of us fails from time to time. If we are wise, we accept these failures as a necessary   1  of the learning process. But too often as parents and teachers we deny this same right to our children. We convey(傳達)  2   by words or by actions that failure is something to be ashamed of, that nothing but   3  performance pleases us.

  4 I see a child under this kind of pressure ,I think of Jack. He is a shy, nervous perfectionist. He   5 answered questions—he might be   6  .

I try my best to    7 his self-confidence. And I repeatedly  8  God for direction. But   9  changed until midterm, when Mary, a student teacher, came to our classroom.

One day we were working with math problems. Jack had copied the problems with care. 10  with his progress, I left the children with Mary .When I returned, Jack was in tears. He’d missed the third problem.

At that time, Mary got a box  11  with pencils from the desk we shared. “Look, Jack ! I’ve got something to show you.” she said.“ See these pencils, they belong to Mrs. Green and me. See how the erasers are   12  ? That’s because we make mistakes too. But we erase the mistakes and try   13  . That’s what you must learn to do, too.” Jack looked up with  14  in his eyes---the first time I’d see on his face that year.

Jack gradually believe him that it’s all  15 to make mistakes – as long as you erase them and try again.

1.                A．life            B．part            C．game     D．show

 

2.                A．neither         B．nor            C．either    D．or

 

3.                A．high           B．bad            C．top  D．big

 

4.                A．When          B．While          C．As   D．Although

 

5.                A．always         B．sometimes      C．ever D．seldom

 

6.                A．right           B．wrong          C．mistake   D．fail

 

7.                A．start           B．set            C．establish  D．build

 

8.                A．told           B．asked          C．said D．spoke

 

9.                A．something      B．nothing         C．anything D．everything

 

10.               A．Kind           B．Nice           C．Great D．Pleased

 

11.               A．filled           B．full            C．deal  D．do

 

12.               A．broke          B．new           C．good D．worn

 

13.               A．once          B．again          C．too   D．either

 

14.               A．disappointment B．sadness        C．fear  D．love

 

15.               A．right           B．OK            C．well  D．good

 

 

查看答案和解析>>

科目：初中英語 來源：2013屆重慶市初二下學期期中考試英語試卷（解析版） 題型：閱讀理解

After a quick breakfast, I went into the lecture(講座) hall in a hurry. A famous teacher was speaking to the students. He was holding up a $100 bill. Then he said to over 300 students, “ Who would like this $100 bill?” The students put up their hands at once. Then he said, “I am going to give this $100 bill to one of you, but first, let me do this.” He made the bill into a ball. Then he said, “Who wants it now?” The hands went back into the air. “Well,” he said, “What if I do this?” and he dropped it on the floor and stepped on it. He picked up the dirty bill and said, “Who still wants it?” Hands went back again into the air.

“My friends,” he said, “you have learned a valuable lesson today. No matter what I did to the $100 bill, you still want this bill. Many times in our life, we are dropped and stepped on. We feel as if we are worth nothing. But remember, no matter what has happened to you, you will never lose your value. You are always valuable to those people who love you. Your value doesn’t come form what you do or whom you know, but who you are.”

1.The lecture was given _____________.

A．in the morning

B．at noon

C．in the afternoon

D．in the evening

2.How many students went to listen to the lecture?

A．Sorry, I don’t know

B．Over 100.

C．Over 200.

D．Over 300.

3.What did the teacher do before he said, “Who still wants it?”

A．He did nothing.

B．He made the bill dirty.

C．He put the bill into a box.

D．He put up his hand.

4.The lesson tells us a truth, that is____________.

A．we should know what we do

B．we should know whom we know

C．we must know who we are

D．how to use money

 

查看答案和解析>>

同步練習冊答案