Have you ever wondered why birds sing? Maybe you thought that they were just happy. After all, you probably sing 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 species are welcome. Your house is your territory where only your family and friends are welcome.If a stranger should enter your territory and threaten you, you

might shout. Probably this would be enough to frighten him away.

If so, you have actually frightened 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.

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

A. an expression of happiness B. a way of warning

C. an expression of anger D. a way of greeting

2.What is a bird’s “territory”?

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

B. A place where a bird may shout 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 their singing helps frighten outsiders away.

C. Because they want to find outsiders around.

D. Because their singing helps get rid of their fears.

4.How does the writer explain birds’ 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.

練習冊系列答案
相關習題

科目：初中英語 來源：北京市八區(qū)2018屆九年級二模分類匯編英語試卷--語基單項選擇 題型：單選題

Harry Potter with its final book in 2007.

A. complete B. completed C. is completed D. was completed

查看答案和解析>>

科目：初中英語 來源：Unit 5 Do you want to watch a game show-八年級英語上冊單元測試卷 題型：單選題

— What will you do after you finish your schoolwork?

— My parents expect me ______ a writer.

A. to become B. becoming C. becomes

查看答案和解析>>

科目：初中英語 來源：湖南省邵陽市2018年中考英語試卷 題型：單選題

_____ Wugang Airport_____ last year?

A. Did; build B. Had; built C. Was; built

查看答案和解析>>

科目：初中英語 來源：湖南省邵陽市2018年中考英語試卷 題型：單選題

– Is this your English book?

–No, it’s my brother’s. is over there.

A. Mine B. My C. Me

查看答案和解析>>

科目：初中英語 來源：江蘇省蘇州市畢業(yè)暨升學模擬考試英語試卷 題型：單選題

---Could you tell me _______?

---Sure. Walk straight along this street and you'll find it.

A. how can I get to the museum B. where is the museum

C. which is the way to the museum D. how far the museum is

查看答案和解析>>

科目：初中英語 來源：江蘇省蘇州市畢業(yè)暨升學模擬考試英語試卷 題型：單選題

The old couple _______happily at their home when I walked past yesterday afternoon.

A. heard singing B. heard to sing C. were heard singing D. was heard to sing

查看答案和解析>>

科目：初中英語 來源：遼寧省營口市2018屆九年級中考模擬（四）英語試卷 題型：英譯漢：整句

73). We are all busy talking about and using the Internet. But how many of us know the history of the Internet?

At first the Internet was only used by the government . _____But in the early_____s , universities, hospitals and banks are allowed to use it , too__ However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990s, computers became cheaper and easier to use. Scientists had also developed software that made “surfing” the Internet more convenient.

____Today it is easy to use the Internet and sending e-mail is more and more popular among students.

The Internet has now become one of the most important parts of people’s life.

1._____________________________________________________________________________

2._____________________________________________________________________________

3._____________________________________________________________________________

查看答案和解析>>

科目：初中英語 來源：Unit 8 How do you make a banana milk shake-八年級英語上冊單元測試卷 題型：信息歸納

閱讀短文，根據(jù)短文內(nèi)容，在表格中填入相應信息。

A plant makes its own food in its leaves(葉). Water comes to the leaves through the roots（根）.Air gets into the leaves through very small holes. The green color in the leaves uses the water and air to make the food for the plant. It also needs sunshine because a plant can make food only when the sun is shining.

Animals and people cannot live without green plants. They both eat plants. People and some animals also eat the meat of some animals and these animals eat plants.

A plant makes its own food in its 56. 1..

Water comes to the leaves through the roots. Air gets into the leaves through small 57. 2. in the leaves.

The green color in the leaves uses the 58. 3., air and the sunshine to make the food for the plant.

Animals and people cannot live without 59. 4..

People and some animals also eat the 60. 5. of some animals which eat plants.

查看答案和解析>>

同步練習冊答案