Have you ever wondered why birds sing? Maybe you thought that they were just happy.  After all，you probably sing or whistle when you are happy.

    Some scientists believe that birds do sing some of the time just because they are happy. However，they sing most of the time for a very different reason. Their singing is actually a warning to other birds to stay out of their territory.

Do you know what a 'territory' is? A territory is an area that an animal，usually the male，claims(聲稱)as its own. Only he and his family are welcome there. No other families of the same kind are welcome. Your garden and house are your territory where only your family and friends are welcome. If a stranger should enter your territory and threaten(威脅)you，you might shout. Probably this would be enough to frighten him away.

If so，you have actually scared the stranger away without having to fight him. A bird does the same thing. But he expects an outsider almost any time，especially at nesting(筑巢)season. So he is screaming all the time，whether he can see an outsider or not. This screaming is what we call a bird's song，and it is usually enough to keep an outsider away.

Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs..

     You can see that birds have a language of their own. Most of it has to do with attracting mates and setting up territories.

1. Some scientists believe that most of the time bird's singing is actually _______.

      A. away of warning              B. an expression of happiness

      C. an expression of anger          D. away of greeting

2.What is a bird's "territory"?.

      A. A place where families of other kinds are not accepted.

      B. A place where a bird may shut at the top of its voice

      C. An area for which birds fight against each other.

      D. An area which a bird considers to be its own.

3. Why do birds keep on singing at nesting season?

      A. Because they want to invite more friends.

      B. Because they want to find outsiders around.

      C. Because their singing helps frighten outsiders away.

      D. Because their singing helps remove their fears.

4.How does the writer explain bird's singing?

A. By comparing birds with human beings.    B. By reporting experiment results.

C. By describing birds' daily life.        D. By telling a bird's story.

 

【答案】

 

1.A

2.D

3.C

4.A

【解析】略

 

練習冊系列答案
相關習題

科目：初中英語 來源： 題型：

根據(jù)短文內(nèi)容及所給首字母提示寫出所缺單詞, 并將完整單詞填在下面對應題號后的橫線上。
Air is very important to everything that lives. But the air we breathe is g  1  dirty. People all over the world are looking for w  2  to make it clean again.
Have you e  3  watched the smoke from chimneys(煙囪) rising high in the air? Have you s  4  the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g  5  to breathe. If we want to keep healthy and strong, we need to breathe c  6   air.
W  7  more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p  8 .
Scientists have a  9  taken actions to stop or slow down some of the things that make the air dirty. They will not stop working u  10  we have clean air again.
1.           2.           3.           4.           5.        
6.           7.           8.           9.           10.        

查看答案和解析>>

科目：初中英語 來源： 題型：


Air is very important to everything that lives. But the air we breathe is g【小題1】___ dirty. People all over the world are looking for w【小題2】___ to make it clean again.
Have you e【小題3】__ watched the smoke from chimneys rising high in the air? Have you s【小題4】__ the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g【小題5】___ to breathe. If we want to keep well and strong, we need to breathe c【小題6】__ air.
W【小題7】___ more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p【小題8】___.
Scientists have a【小題9】__ found ways to stop or slow down some of the things that make the air dirty. They will not stop working u【小題10】__ we have clean air again.

查看答案和解析>>

科目：初中英語 來源： 題型：

單詞拼寫（共10小題，計10分）
根據(jù)下列句子及所給單詞的首字母，在答題紙上按題號寫出各單詞的完全形式（每空限填一詞）。
【小題1】 Be careful. There is a wine b_______ on the table. You might break it.
【小題2】 The number after twenty-nine is t________.
【小題3】Have you e________ been to the Great Wall?
【小題4】It’s dangerous to d________ a car after you get drunk.
【小題5】Your parents are your f________ and mother.
【小題6】If a dream comes t________, it actually happens.
【小題7】W________ is the coldest season of the year.
【小題8】When snow f________, it comes down from the sky.
【小題9】It’s best to water plants either e________ in the morning or late at night.
【小題10】We don’t go to the c________ much for movies because we have a video.

查看答案和解析>>

科目：初中英語 來源：2010-2011學年江蘇省鎮(zhèn)江市初三上學期期末考試英語卷 題型：其他題

根據(jù)短文內(nèi)容及所給首字母提示寫出所缺單詞, 并將完整單詞填在下面對應題號后的橫線上。

  Air is very important to everything that lives. But the air we breathe is g  1   dirty. People all over the world are looking for w  2   to make it clean again.

Have you e  3   watched the smoke from chimneys(煙囪) rising high in the air? Have you s  4   the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g  5   to breathe. If we want to keep healthy and strong, we need to breathe c  6   air.

W  7   more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p  8  .

Scientists have a  9   taken actions to stop or slow down some of the things that make the air dirty. They will not stop working u  10   we have clean air again.

1.            2.            3.            4.            5.        

6.            7.            8.            9.            10.        

 

查看答案和解析>>

科目：初中英語 來源： 題型：

根據(jù)首字母 及上下文提示完成對話

A: Have you e_80___ been to Tokyo?

B: No, I have n___81__ been there before. But this summer I will go there with my parents.

   A: I am s__82__ you will like it. My uncle u__83___ to work in Tokyo. But now he has g__84___to Paris for an i___85___ meeting. He will give a talk about how to p____86___ whales next week.

   B: Paris? That is a really wonderful city with a very b__87_______ view.

   A: R___88____? H__89___ I wish I could go there!

   80____________81_____________82______________83______________84_____________

85____________86______________87_____________88______________89_____________

查看答案和解析>>

同步練習冊答案