精英家教网 > 初中英语 > 题目详情

When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time.

Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth’s atmosphere (大气). Light is “bent (弯曲的)” when it travels through different parts of the earth’s atmosphere. As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too.

The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.

This twinkling effect causes a lot of problems for astronomers (天文学家) since they cannot observe the stars clearly. A telescope (望远镜) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better.

根据短文内容,选择最佳选项。 (10分)

1.What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?

A.It looks even brighter.

B.It looks as if it is bent.

C.It looks as if it is moving.

D.It looks like drops of rain.

2.Scintillation also happens on      according to the passage.

A.rainy days                             B.shiny days

C.cloudy days                            D.windy days

3.What can you see when you drop a rock into the water?

A.The rock gets broken.

B.The rock becomes unclear.

C.The water becomes much polluted.

D.The water does not move anymore.

4.The underlined word “observe” means “    ”.

A.watch            B.listen             C.draw             D.explain

5.Why is scintillation a problem for astronomers?

A.The stars never stay still.

B.It makes the stars too dark to see.

C.It makes astronomers feel too hot to work.

D.Astronomers cannot observe the stars clearly.

 

【答案】

1.C

2.B

3.B

4.A

5.D

【解析】

试题分析:这篇短文主要介绍了发生在大气中的一种重要的自然现象——交光现象,短文详细的介绍了这种现象的科学原理及其对宇航员工作的影响。

1.根据第二段As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too.描述,可知它看起来好像在移动,故选C。

2.根据第三段The same thing also happens to things on the ground. On a very hot and shiny day, 描述,可知交光现象也可能发生在白天,故选B。

3.根据第三段You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.描述,可知石头变得看不清楚了。故选B。

4.联系上下文,可知此处指的是,由于他们不能清楚地观察到星星。故选A,观察。

5.根据最后一段This twinkling effect causes a lot of problems for astronomers (天文学家) since they cannot observe the stars clearly. 描述,可知因此宇航员就不能清晰地观察星星了。故选D。

考点:科普类说明文阅读

点评:本文浅显易懂,各个小题都能在文中找到适当依据。只要认真阅读短文,注意前后联系,就能顺利完成阅读。文章所设试题主要考察细节查找,做题关键是找出原文的根据,认真核查小题和原文的异同。

 

练习册系列答案
相关习题

科目:初中英语 来源: 题型:022

(补全单词)Please turn off the lights when you l ______ a room.

查看答案和解析>>

科目:初中英语 来源: 题型:阅读理解

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(欣赏)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.act 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!
根据材料内容选择最佳答案,并将其标号填入题前括号内。
【小题1】This text is written for           
A.teachersB.parentsC.studentsD.visitors
【小题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.are too young to look after themselves
【小题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
【小题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
【小题5】The expression “feeling left out'’ means“        ”in Chinese.
A.受冷落    8.被调侃    C.挨批评    D.遭攻击

查看答案和解析>>

科目:初中英语 来源:2011-2012学年江苏省无锡市南长区初一下学期期中考试英语试卷(带解析) 题型:单词拼写

根据情景和所给的首字母,在空格内填入一个适当的单词,使对话意思完整
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:初中英语 来源:2015届山东东营河口区实验学校八年级上学期期中考试英语卷(解析版) 题型:其他题

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(滚轮冰刀鞋) , 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:初中英语 来源:2012-2013学年浙江省九年级上学期期末模拟考试英语试卷(解析版) 题型: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(编辑) , 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.advice         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>>

同步练习册答案