When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from where you are so that there would be no light for the book to reflect, then you could not see the book even with your eyes wide open.

Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all. Light reaches us from the moon, which is about 380 000 kilometers away, in only a little more than a second.

25. You can see the book because__________.

A. your eyes are close to it　　　　　　　　　　　　　　　 B. your eyesight can get to it

C. it has light of its own　　　　　　　　　　　　　　　　　 D. it reflects some of the sunlight

26. The underlined word “l(fā)uminous” means__________.

A. visible（可見的）　 B. all colors　　　　　　　 C. giving off light　　　　 D. sunlight

27. Which of the following is true?　

A. All the things you can see give off light.

B. Light from the book is much shorter than that from the moon.

C. Light travels so fast that there is no time for you to read.

D. The moment you open your eyes the light from the book travels to your eyes.

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：初中英語 來源： 題型：022

(補(bǔ)全單詞)Please turn off the lights when you l ______ a room．

查看答案和解析>>

科目：初中英語 來源： 題型：閱讀理解

Feeling left out?
A reader wrote in to say that she was feeling lonely at break because her best friend
wasn’t around．Here’s our advice to her—and to all kids who feel lonely sometimes．
It’s hard when a best friend isn’t around—maybe because she moved to a different
school or a different class．You may feel lonely at break or lunchtime．You want to have new
friends．but how do you make them? Maybe it seems like everybody else already has their
friends．But remember, there’s always room for more friends．  
Start by looking around your classroom—think about which kids you’d like to play
with at break．Look for chances to say hi to them，smile，and be friendly．Offer to share
something or express your appreciation(欣賞)to them．Invite someone to play with you or
say “Do you want to sit here?” in the lunchroom．When you’re at break，walk over to kids
you want to play with．a(chǎn)ct friendly，and say “Hi，can l play, too?” or just join in．
If you have trouble doing this or if you’re feeling shy, ask your teacher to help you make
new friends．Teachers are usually pretty good at matching up friends．The best way to make
friends is to be a friend．Be kind，be friendly，share，say nice things，offer to help—and pretty soon，you’ll have one，or two，or even more new friends.
You might still miss that special best friend．But when you see each other, you can share
something you didn’t have before she left：You can introduce her to your new friends!
根據(jù)材料內(nèi)容選擇最佳答案，并將其標(biāo)號(hào)填入題前括號(hào)內(nèi)。
【小題1】This text is written for           ．
A．teachersB．parentsC．studentsD．visitors
【小題2】According to the writer, some kids feel lonely at break because they        ．
A．have trouble with their studiesB．don’t have their best friends around
C．need their parents to be with themD．a(chǎn)re too young to look after themselves
【小題3】The underlined word this in Paragraph 4 refers to(指的是)       ．
A．sharing your ideasB．talking before many people
C．studying better at schoolD．developing new friendship
【小題4】Some kids need help from teachers to make friends because         ·
A．they miss their old friends a lot
B．they have no time to stay with others
C．teachers know who wants a new friend
D．they are shy or not good at making friends
【小題5】The expression “feeling left out'’ means“        ”in Chinese．
A．受冷落    8．被調(diào)侃    C．挨批評(píng)    D．遭攻擊

查看答案和解析>>

科目：初中英語 來源：2011-2012學(xué)年江蘇省無錫市南長區(qū)初一下學(xué)期期中考試英語試卷（帶解析） 題型：單詞拼寫

根據(jù)情景和所給的首字母，在空格內(nèi)填入一個(gè)適當(dāng)?shù)膯卧~，使對(duì)話意思完整
What must you do when you get a present for your birthday? You have to sit down and
w  1  a thank-note. The w 2   “thank you” are very important. We have to use them very often. We say them when someone gives us a drink, h  3   us to pick up things, or lends us a book.
A  4    important word is “please”. Many people forget to use it. It is n  5    polite to ask someone to do something without s  6    “please”. We have to use it when we ask for something, too. It may be a book or a pencil, more rice or help.
We have to l  7    to say “sorry”, too. When we hurt someone, we’ll have to go up to say “we’re sorry”. When we forget something, we will a  8    say “sorry”.
These three words are easy b  9    important. Our children must learn to use them. They are pleasant words to use in a  10    language.

查看答案和解析>>

科目：初中英語 來源：2015屆山東東營河口區(qū)實(shí)驗(yàn)學(xué)校八年級(jí)上學(xué)期期中考試英語卷（解析版） 題型：其他題

New York is one of the most exciting c___1.___ in the world. You might want to do some shopping in New York. Fifth Avenue is probably New York’s most f____2.____shopping street, but if you go, be prepared to “window shop” only. This is shopping for the r___3.____. There are others , less expensive shopping areas nearby , and they’ll soon come a___4.____ famous stores such as Bloomingdales, Macy’s and FAO Schwartz.

And if you’ve brought your rollerblades(滾輪冰刀鞋) , t___5.____ a visit to

Central Park is a must. This is a large, open park right in the middle of Manhattan, but if you thought that people came here to r___6._____, sit down for a few minutes and get a____7._____ from the rush of New York life, then you’d been wrong. N____8.___ sits in Central Park: they run, jpg(慢跑) , and m___9.____ of them wear their rollerblades.

When you l___10._____ New York, you might be tired, but the one thing you won’t be is bored!

 

查看答案和解析>>

科目：初中英語 來源：2012-2013學(xué)年浙江省九年級(jí)上學(xué)期期末模擬考試英語試卷（解析版） 題型：完型填空

完型填空

On my first job, I worked as a sports editor for a small newspaper. I never got a letter from my readers, so I was   l  that there was an envelope（信封）on my desk one morning. From the   2 , I could see it was from a most popular newspaper.

When I opened it, I found a note and it read, “You did a good job. Go on!”

The note was   3  by Mr. John, a famous sports editor. As I was a green hand（新手）, his words made me   4  . After that, I kept the note in my desk drawer. Whenever I doubted  5  I had the ability to be a good editor(編輯) , I would read John’s note and become  6  again.

Later, when I made friends with Mr. John, the note writer, I learned that he often wrote notes to   7  young people in many fields. “When I make   8  feel happy,” he told me, “I feel happy, too.”   9 , why are there few note writers like John in our life? In my   10 , many people are afraid that they cannot be well understood. Also, writing takes more time and it is not  11  to pick up the phone. The problem with phone calls is that they cannot   12   a long time, but a note is a good way of record and our words can be read   13 .

So, when you find some people around you need   14 , please write a note of encouragement to bring them more confidence. Maybe, you are not sure what will  15 , but remember Mr. John’s words—making others feel happy makes you happy, too.

1.                A．certain         B．sure           C．surprised D．frightened

 

2.                A．calendar        B．envelope       C．book D．photo

 

3.                A．signed         B．picked          C．copied   D．practiced

 

4.                A．unhappy        B．sleepy          C．excited   D．sad

 

5.                A．why           B．that            C．what D．whether

 

6.                A．serious         B．confident       C．strict D．humorous

 

7.                A．expect         B．describe        C．introduce D．encourage

 

8.                A．other          B．the other       C．others    D．the others

 

9.                A．But            B．However        C．Therefore D．Actually

 

10.               A．opinion         B．a(chǎn)dvice         C．idea  D．decision

 

11.               A．stronger        B．weaker         C．harder    D．better

 

12.               A．wait           B．last            C．stop  D．rest

 

13.               A．once          B．only once       C．more than once     D．less than once

 

14.               A．thanks         B．truth           C．trouble    D．help

 

15.               A．happen        B．matter         C．turn  D．hold

 

 

查看答案和解析>>

同步練習(xí)冊(cè)答案