Light travels at a speed which is about a million times faster than the speed of sound. You can get some idea of this difference by watching the start of a race. If you stand some distance(距離) away from the starter, you can see smoke from his gun before the sound reaches your ears.
This great speed of light produces some strange facts. Sunlight(太陽光) takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light that you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km. per minute. In some cases, the light from one of tonight’s stars had started on its journey to you before you were born.
Thus, if we want to be honest, we can’t say, “The stars are shining tonight.” We have to say instead, “The stars look pretty. They were shining four years ago, but their light has only just reached the earth.”
小題1:Light speed is ______ sound speed.
A．a(chǎn)s fast as
B．a(chǎn) million times slower than
C．a(chǎn)bout millions of times faster than
D．a(chǎn)bout a million times faster than
小題2: If you stand 200 meters away from a man who is firing a gun to start a race, you will find out that ______.
A．you can hear the sound before you see the smoke
B．the sound does not travel as fast as light
C．the sound will reach you before the man fires
D．sound travels about a million times faster than light
小題3:Sunlight obviously(顯然的) ______ than the light of the moon.
A．has to travel a greater distance
B．moves less quickly
C．travels much more quickly
D．is less powerful
小題4: The scientific way of saying "The stars are shining tonight" should be ______.
A．the stars have been shining all the time
B．the stars seen tonight will shine four years later
C．the stars were shining long ago but seen tonight
D．the starlight seen today could be seen four years ago

小題1:D
小題2:B
小題3:A
小題4:C

試題分析：這篇短文中作者主要介紹了光的傳播速度要遠遠高于聲的傳播。文章又向我們描述了一種奇怪的自然現(xiàn)象，引起了人們的思考。
小題1:細節(jié)理解題。根據(jù)短文第一句話Light travels at a speed which is about a million times faster than the speed of sound.可知光的傳播速度比聲音的傳播速度要快一百萬倍；故選D。
小題2:細節(jié)理解題。根據(jù)短文第一段最后一句話If you stand some distance(距離) away from the starter, you can see smoke from his gun before the sound reaches your ears.可知，看到煙霧要比聽到聲音早，即聲音和光傳播的并不是一樣快的，其他三項表述錯誤；故選B。
小題3:推理判斷題。根據(jù)短文第二段Sunlight(太陽光) takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays left the moon 1.3 seconds before they reached you.兩句可知，太陽光傳播的距離要遠遠大于月光；故選A。
小題4:推理判斷題。根據(jù)短文最后一句話“The stars look pretty. They were shining four years ago, but their light has only just reached the earth.”可知我們今晚看到的星光是四年前就已經(jīng)發(fā)射出來了，只是我們現(xiàn)在才看到；與C項描述相吻合；故選C。
練習冊系列答案
相關(guān)習題

科目：初中英語 來源：不詳 題型：閱讀理解



Wang Jiaming from Beijing Chenjinglun High School says he is a lucky boy .He’s happy that he’s sitting the senior high school entrance exam in2014 instead of 2016.
On October 22,Beijing Municipal Commission of Education* announced that, from 2016,the English scores in the senior high school entrances exam will be reduced* from 120 to 100.Of the 100 points, the listening ability scores will increase to 50.Meanwhile, the points for Chinese will increase from 120 to 150.
“The change won’t affect me. I fell so lucky because English is my strongest subject,’’ said Wang. Why such a change? It places the importance on Chinese in our study and reduces students’ pressure, said Li Yi, a spokesman of the commission.
“The change will also push us to pay attention to the practical usage of English.,’’ said Li. “Students will be encouraged to learn to understand English menus and read English news on mobile phones.”
There isn’t news that other cities will have the same change. But several places are making changes to English tests in the college entrance exams.
For example, Shandong is considering taking out the listening part of the English exam in its Gaokao. But, “ being tested for less points doesn’t mean the subject can be taken lightly,” Bai Ping wrote in China Daily.
English has long been the world’s most commonly used language. Wang Jiaming said he understood the change.
“Chinese, not English, is our mother tongue*,” he said. “ but still, I think English is both interesting and useful.”
小題1: In the Beijing senior high school entrances exam of 2016, the English scores will be cut down to __________.
A．50B． 100C．120D．150
小題2: Wang Jiaming feels lucky because _______
A．the exam change from 2016 doesn’t affect him
B．he doesn’t need to take the important exam
C．Chinese is his strongest subject
D．he is not good at chemistry
小題3:The sentence “ being tested for less points doesn’t mean the subject can be taken lightly,” in the passage means ______________
A．the students can spend less time on English.
B．it’s harder to for the students get a high score.
C．English is not as important and useful as before
D．studying English is still important for the students.
小題4: What is the main purpose of the change?
A．To encourage students to learn how to order meals in English.
B．To make students to learn to read English news on mobile phones.
C．To ask students to prepare for the college entrance exam.
D．To make students pay more attention to learn Chinese.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

We all know the dangers of fires. It's good and necessary for a family to learn how to prepare for a fire，and here are some suggestions.

Put a smoke alarm in the house. Smoke from a fire causes the alarm to go off. The alarm makes a loud sound. The sound tells everyone to leave the house at once.
Make escape plans. We should know all the ways out of the house. If there is a fire，everyone follows the plan to get out. Part of the plan is to check all the windows to make sure they can be opened easily.
Buy fire extinguishers（滅火器）in the house. Everyone in the family should know how to use them. Practice for a fire. We do fire practice because we teach children about fire safety. Everyone in the family should know the following fire rules：
★Don't open a hot door! The fire can grow more quickly if you open the door.
★Stay close to the floor! Smoke can be more dangerous than fire. The best air is near the floor because smoke rises.
★What will you do if your hair or clothes star to burn? First. stop! Don't run! The fire burns faster because of more air. Drop! Fall to the floor. Then roll! Turning over and over will make the fire go out. Put a blanket around you to keep air away from the fire that may still be on you.
There are many possible causes for fires. A wise family is ready all the time. If there is a fire. don't forget to call 119 for help.
小題1: When a fire happens，_______ if you open the hot door.
A．the door will soon be on fire
B．the electricity will be cut off
C．the fire will grow more quickly
D．the house will fall down
小題2:What are the right steps you should take when your hair or clothes catch fire?
A．Stop, run, roll. B．Stop, drop, roll.
C．Run, drop, roll. D．Roll, drop, stop.
小題3: What is the best title for this passage?
A．The Dangers of a Fire.
B．The Causes of a Fire.
C．Learn to Use a Fire Extinguisher.
D．Be Ready for a Fire.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

If I ask you to shut your eyes and gave you a piece of apple to eat, would you be able to tell me what it is just by tasting it? Of course, you could. Your tongue is covered with tiny “taste buds” which help you know what different foods taste like. Do you know that foods would taste different if you did not have a nose? This experiment shows how important your nose is when you taste things.
What You Need:
? a friend to help
? small pieces of any food like carrot, orange, banana
? small pieces of apple, raw(生的) potato, and onion
What You Do:
There are actually three different experiments. You and your friend should take turns to try them on each other.
Experiment 1:
Have your friend close her eyes and open her mouth.
Give her a piece of the food and ask her to taste it.
Then, ask her what she thinks it is. She will probably guess correctly.
Experiment 2:
While your friend has her eyes closed, give her a piece of the raw potato. At the same time, hold a piece of apple right under her nose. Ask her to eat the potato (but don’t call it by name) and tell you what she thinks it is. She will say it is a piece of apple!
Experiment 3: (for the brave)
Take a piece of raw onion. You don’t have to close your eyes this time. Squeeze your nose closed with your other hand so that no smells can get into your nose. Now take a nibble of the onion. Surprise! As long as you hold your nose, you will not be able to taste the onion.
The Science Secret
You already know the science secret. Your nose and your tongue work together to make food taste the way it does. Your tongue, however, can taste only certain flavors like salty, bitter, sour, and sweet. All of the other “tastes” are actually “smells,” and you need your nose to “taste” them. Oh, and you might use this science secret the next time you are told to eat something you don’t like the taste of. If you hold your nose while you eat it, you won’t “taste” it at all.
小題1: According to this article, what could a reader know about food?
A．People hold their noses to eat onions.B．If you can smell potatoes, you will taste apples.
C．People need a sense of smell to taste some food.D．If you close your eyes, food will taste better.
小題2:What is the most likely reason Experiment 3 is called “for the brave”?
A．You keep your eyes open.B．You have to eat a raw onion.
C．You have to squeeze your nose.D．You do the experiment alone.
小題3:What’s the best title of the passage?
A．Your Eyes KnowsB．Your Nose Knows
C．Your Mouth KnowsD．Your Tongue Knows

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

"Here's the advance payment(預期款) of 10,000 dollars. You will get the other half when we get those papers," the agent told Mike. "But sir, Mr. Smith has been very suspicious (懷疑) since last week," Mike replied.
"In that case, be careful and don't worry. You are very clever," the agent said." Take 5,000 dollars more," Mike looked around uneasily but took the money.
Mike was a clerk in a large company. A few years ago he started to get very worried because it was very hard for him to support his family. He wanted to give his child an excellent education and a bright future, but the future looked rather hopeless.
One day some agents called him. They were his company's competitors. At first he refused their offers. But when he thought his dream could come true, he agreed to their offers and began giving them information.
However, his spy work started to get more and more difficult because his owner had become suspicious, since a lot of important information was leaking out.
One night when Mike was on one of his spying tasks, he met Alim, the night watchman." What are you doing here, Mike?" shouted Alim.
"Oh, I had just forgotten some documents here, Alim, "Mike replied, trying to look comfortable." I just came to get them."
"Is that true?" Alim said." We’ll see what Mr. Smith says."
Alim called Mr. Smith and told him to come right away. Mr. Smith looked at Mike and said. "So you are the thief! I believed in you, Mike."
"Call the police, Alim. We have finally caught the spy," Mr. Smith said. "And by the way, Mike ,no man can serve two masters. You should have left if you did not work with us any longer."  
小題1:Why did Mike take the job as a spy? Because ______________.
A．he didn't want to work for his company any longer.
B．some agents forced him to do so.
C．he wanted to give his child an excellent education and bright future.
D．Mr. Smith did not give treat him very well.
小題2:What did the agents ask Mike to do?  
A．To give them some important information of his company.
B．To follow his boss secretly.
C．To serve his master very honestly.
D．To leave his company and join them.
小題3:Mr. Smith thought Mike was______ before he knew that Mike was a spy.
A．kindB．cleverC．honestD．dishonest
小題4:What's the meaning of the phrase "leak out" in the passage?___________.
A．land onB．cross outC．become knownD．come out
小題5:What can you learn from the passage?______________.
A．We should be careful at work.B．We should be honest at work.
C．We should work hard.D．We should serve the masters.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

It's over three years since I began to learn English. I am glad that I am getting on well with it.  I find English very interesting, but quite difficult. When I first started, I thought I had only to remember the new words and learn some grammar. I know little about English idioms(習語). I thought each English word had a word with the same meaning in Chinese. When I learned to say "I see a book on the desk", I thought the English word "see" was just like the Chinese word "kan". So one day when my teacher asked me, "What are you doing?" I answered, "I'm seeing a book." "That's wrong," the teacher said. "You don't see a book. You read a book. You can't use an English word like a Chinese one. Be sure not to make the same mistake again." 
After that I began to pay more attention to the differences between Chinese and English. For example, in English we say a "high mountain", but a "tall man". In Chinese we use the same word "gao" for both. Again in English we say "take part in the sports meeting", "attend a meeting" and "join the army", while in Chinese we can use "can jia" for all the three. It's interesting, isn't it? So to study English doesn't only mean hard work, it can be great fun, too! We not only have to pay attention to pronunciation, grammar, spelling and handwriting, we also have to understand English idioms. We can learn English well only in that way!
But all this is only a beginning and I still have a long way to go. I'll try my best and work even harder than before. I must speak and listen to English more both in and out of class. I must read and write more, too. I must learn English well so that I can work well when I grow up. 
小題1:When I first started learning English, I thought __________.
A．I couldn’t learn it well because it is quite difficult
B．I could learn it well if I had remembered the new words and learned some grammar
C．English is interesting and easy to learn
D．each English word couldn't find a Chinese word with the same meaning
小題2:Which of the following statements is NOT TRUE according to the text?
A．To understand English idioms is a useful way to learn English.
B．To pay attention to pronunciation and grammar helps us learn English well.
C．To read and write more is helpful in learning English.
D．To study English only means working hard.
小題3:Which is the best topic of the passage? 
A．How to study English well
B．The importance of English
C．English idioms
D．Do more reading

查看答案和解析>>

科目：初中英語 來源：不詳 題型：完形填空

Are you ____ about how to study and make your study more effective(有效率的)? We all know that some students usually study very hard for a long ___. This is very good, but it doesn’t ___a lot, for an effective student must have enough sleep, enough food and enough rest and exercise. Every day you need to go out for a walk or visit some friends or some nice places. It’s ____ for your study.
When you return ____ your studies, your mind will be refreshed and you’ll learn more ____ study better. Psychologists(心理學家)__ __ that learning takes place this way. Here take English learning as an example. First you make a lot of progress and you will feel happy. Then your language seems to stay the same. So you will think you are learning ____ and you may give up. This can last for days or even weeks , yet you can’t give up. Later your language study will again take another big ____. You will see that you really have been learning all along. If you get enough sleep, food, rest and exercise, studying English can be very effective and ____. Don’t give up along the way. Learn slowly and you’re sure to get a good result.
小題1:
A．nervousB．worriedC．worryD．unhappy
小題2:
A．daysB．timeC．hoursD．weeks days
小題3:
A．giveB．makeC．helpD．take
小題4:
A．goodB．badC．wellD．worse
小題5:
A．a(chǎn)fterB．a(chǎn)tC．toD．for
小題6:
A．a(chǎn)ndB．yetC．orD．but
小題7:
A．toldB．have foundC．saidD．have taught
小題8:
A．somethingB．a(chǎn)nythingC．everythingD．nothing
小題9:
A．workB．walkC．waitD．jump
小題10:
A．interestingB．hardC．possibleD．boring

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Sports can help us a lot. Taking exercise can make us strong. In collective集體的sports like basketball,volleyball or football,wewill learn the importance of cooperation合作. And sports can also help us relax after work or study.
However,as the saying goes,“There are two sides of everything. ”Sometimes we may hurt other players or ourselves if we are not careful enough when participating參加in sports activities. What’s more,too much or hard practice can be bad for our health.
Sports can make us healthy both physically and psychologically心理地. It is also a good way for people to know each other and can improve friendship between people. So long as we are careful enough,sports can do us nothing but good.
小題1:　　　can make us strong.
A．Taking exerciseB．Singing
C．SleepingD．Making friends
小題2:Too much exercise can be　　　for us.
A．good B．bad　C．helpfulD．enough
小題3:Which of the following is NOT true?
A．Basketball and volleyball are both collective sports.
B．Sports can help us relax after work or study.
C．Sometimes we may hurt other players or ourselves when participating in sports activities.
D．Sports can only make us healthy physically.
小題4:The best title for this passage can be“　　 　”.
A．Sports and health
B．Everybody must do sports
C．Sports are nothing to people
D．No one likes sports

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Welcome to skillcorner.com ! Please use the free study skills, study strategies and study tips on this site. We add new tips every day, so check back often for new ideas. Click (點擊) on any topic below to learn about it .
Preparing to Study
A Strategy for Reading Textbooks
Learning Style
Building Vocabulary
Good Listening in Class
Using Dictionaries
Study Groups
A Strategy for Talking Tests
Reading Skills
Remembering Information
A Strategy for Reading Novels
Managing Time
__________________________
    We often add study tips given by our visitors. Click on Submit (提交) Your Own Study Tip to send your study tip to us, and we may show it on this site . Click on Study Tips from Our Visitors to read tips that have already been added to this site. Come back often to see new tips that have been added.
1. Submit Your Own Study Tip
2. Study Tips from Our Visitors
3. About the Authors of This Site
4. E-mail Us
小題1:What kind of website is it?
A．A news website.B．An entertainment website.
C．A study website.D．A travel website.
小題2: How can you get useful information from the website?
A．By paying some money.
B．By sending your own study tips and exchanging them with others.
C．By sending an e-mail to ask for some.
D．Just getting it for free.
小題3:What message can probably be put in the blank space in the form?
A．Funny Stories.B．Writing SkillsC．New Books.D．Fashion News.
小題4: You will find some useful information except about ______ on this website.
A．how to use dictionaries.B．tips for reading
C．skills to remember new wordsD．how to make friends.
小題5:Of the four choices at the bottom(末端) of the form, which should you click on if you want to tell people about new ways to study？
A．The first one.B．The second one.C．The third oneD．The fourth one.

查看答案和解析>>

同步練習冊答案