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.
小題1: Some scientists believe that most of the time bird’s singing is actually _______.
A．a(chǎn)way of warningB．a(chǎn)n expression of happiness
C．a(chǎn)n expression of angerD．a(chǎn)way of greeting
小題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.
小題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.
小題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.

小題1:A
小題1:D
小題1:C
小題1:A
小題1:根據(jù)Some scientists ……because they are happy.因為他們高興，所以選A，一個高興的表情。
小題2:根據(jù)A territory is an area……claims(聲稱)as its own.聲稱是它自己的，選D，鳥認(rèn)為是屬于它自己的地方。
小題3:根據(jù)especially at nesting(筑巢)season.……and it is usually enough to keep an outsider away.這一段可知通過這一手段足可以讓外人遠(yuǎn)離。所以選C，因為他們的歌聲有助于嚇跑外來者。
小題4:最后一段把鳥類的歌聲比作人類的語言，可知選項A,把鳥類同人類進行對比，最符合題意。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：初中英語 來源：不詳 題型：閱讀理解

根據(jù)短文內(nèi)容，判斷下列句子正誤。正確的用“A”表示，不正確的用“B”表示。
Is an earthquake dangerous? Yes, of course. But this doesn’t mean you can’t do anything about it. If you know what to do in an earthquake, you can be safe.
Keep a cool head. Worry may cause bad decisions. Don’t follow others blindly. Think about what you should do. The first several minutes are important.
If you are indoors during an earthquake, quickly move to a safe place in the room such as under a desk or table. Take care of your head. Stay away from windows and things that may fall and hurt you.
If you are in a crowded room and far away from the door, don’t rush to it. You will find too many people trying to escape at the same time. Instead, stay under a desk or table. Don’t use an elevator. You may not get out of it.
Stay in a safe place until you are sure it’s OK to leave. Some aftershocks (余震) may follow an earthquake. These are as dangerous as the earthquake.
If you are in debris (廢墟), try to free your hands and legs. You may make noises by hitting stones. Shouting will make you tired. Try to find some water and food. They are important for you if you aren’t found in a short time. Wait patiently for help.
小題1:Don’t stay near the windows if you are indoors during an earthquake.
小題2:You may not get out if you use an elevator during an earthquake.
小題3:Rush to the door together if you are in a crowded room in an earthquake.
小題4:Keep staying in a safe place until you are sure it’s OK to leave after an earthquake.
小題5:You should keep shouting until others hear you if you are in debris.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Online shopping is growing fast in China, and more and more Chinese are buying books online. At the same time, traditional bookstores are facing new challenges. A bookstore in Beijing is going out of business（生意）. All of its books are on sale. Bookstore owner Wang Jian says hot sales of books on the Internet pushed him to change the way he did business.
China has the highest online book buying rate（率）in the world. More than years ago, dangdang.com became the first online bookseller, and now becomes very important in the Chinese online book market.
Facing this challenge, the Xinhua Bookstore also built its online store a few years ago. Zhang Jian, CEO of the Xinhuabookstore.com, says now they are enlarging their online services.
A “price war（戰(zhàn)爭）”is taking shape between traditional bookstores and online bookstores. Faced with the low-cost advantage of online bookstores, traditional ones can do nothing but lower their prices. At the same time, online bookstores are also starting price wars between each other.
Now some traditional bookstores are trying their best to attract buyers in their own way. They exhibit books better and provide(提供) a very relaxed reading environment in the bookstore. Even though, traditional bookstores can hardly compete with some of the advantages of online bookstores, for example 24-hour service.
小題1:What is the passage about?
A．The development of online bookstores.
B．The disadvantages of traditional bookstores.
C．The great advantages of online bookstores.
D．The challenges traditional bookstores face.
小題2:What made Wang Jian change the way he did business?
A．The small sales of his books.
B．The tiring work of selling books.
C．The high cost of running the bookstore.
D．Competition with other traditional bookstores.
小題3:To attract buyers, traditional bookstores and online bookstores both choose to        .
A．lower the prices of books
B．provide 24-hour service
C．provide relaxed reading areas
D．exhibit books in a better way
小題4:We can know from the passage that       .
A．traditional bookstores will break up sooner or later
B．dangdang. com is the first website selling books in China
C．more and more people will start bookstores on the Internet
D．most of the buyers who buy books online are young students

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Shanghai’s Maglev Train(磁懸浮列車) runs from Longyang to Pudong International Airport(國際機場). The whole trip takes about 8 minutes.
Time
First train
Longyang Road station
6:45
Airport Station
7:02
Last train
Longyang Road Station
21:40
Airport Station
21:42
Tickets
 
Economy Class(普通座)
VIP
Single Trip(單程旅行)
50 yuan
100 yuan
Round Trip(往返旅行)
80 yuan
160 yuan
Children at or under 120 cm tall don’t need to buy tickets to take the train, but they cannot take the train by themselves. Children above 124 cm must buy a full-price ticket.
If you buy a round ticket, you can get on the train at Longyang Road Station or Pudong Airport Station, and get off at the other station. The return part of the ticket must be used on the same day.
小題1:How long does it take to travel from Longyang Road Station to Pudong International Airport by Shanghai Maglev Train?
A．About five minutes.B．About six minutes.
C．About eight minutes.D．About nine minutes.
小題2:Mr Wang will buy an Economy class ticket to Pudong International Airport with his 120 cm tall son. He should pay___________ for the trip.
A．50 yuanB．100 yuanC．150 yuanD．200 yuan
小題3:The first train from Airport Station to Longyang Road Station leaves__________.
A．6:30B．6: 45 C．7:02D．7:20
小題4:A passage( 乘客) who buys a round trip ticket__________.
A．can take the train three times
B．must take the train back on the same day
C．can only get on the train at Longyang Road Station
D．can only get off the train at Pudong Airport Station
小題5:A boy who is 130 cm tall__________.
A．can take Shanghai Maglev Train by himself
B．doesn’t need a ticket to take the train
C．has to take the train with his parents
D．can take the train with a half-price ticket

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

This is my school. There are many trees and flowers in it. The teaching building is big and tall. There is a big playground in our school. After 4:30 in the afternoon, many students come to the playground to play football and some students play table tennis in the table tennis room.
There are 1,200 students in 25 classes in our school. The students all like to study. The teachers in our school are very good. They help the students to study and the students like them, too.
小題1:The school looks _____.
A．smallB．oldC．niceD．new
小題2: It’s very nice for this school to have ____.
A．trees and flowersB．a(chǎn) playgroundC．students and teachersD．desks and chairs
小題3: There are at least (至少) _____ students in one class.
A．45B．65C．75D．55
小題4: After class the students often go to _____.
A．their classroomB．their homesC．the playgroundD．the art room
小題5:What may teachers not do?
A．Give the students lessons.B．Play football and table tennis with the students.
C．Don’t like some students.D．Help students to study.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

A desert is a very dry land where there is hardly any rain. In the day, it can be so hot that you could fry an egg on the ground. But during the night it is sometimes so could that water would turn into ice.






Many desserts are covered in sand. But some have mountains, rocks, or lakes that have dried up in the heat. The Great American Dessert has cliffs(懸崖) that have been made into amazing and beautiful shapes by the wind. The Sahara Desert in Africa is mostly sand. The Australian Desert has red sand.
Sometimes it does not rain for a whole year in the desert. But there is water deep under the ground and some plants have roots that go very deep to find it. Other plants have roots that spread out(延伸) a long way so they can suck up the rain as soon as it falls.
One desert plant is the cactus, which has long, spreading roots. The cactus stores water inside its hard skin. This skin protects it from heat and cold.
Camels are a bit like cactus plants! They store water too—inside their bodies. They have special fur which protects them from the sun during the day and keeps them warm at night.
Some other animals live in deserts, too. They have to be very good at seeing and hearing because most of them only come out at night. This is why many desert animals have extra big eyes or ears.
A desert fox has bigger ears than a normal for. A gerbil has huge eye, so that it can see at night. It stays cool in the day by staying underground, like most desert animals.
Some people live in the desert but they always make their homes near an oasis. An oasis is where water comes from an underground river. Near an oasis, people can grow lots of plants and keep animals.
Life is hard in the desert, for people, animals and plants. But desert people like to live there.
小題1:A desert is very dry because__________.
A．it is sandyB．there is so little rain
C．the wind is strongD．there is no water deep under the ground
小題2:What does the underlined phrase"suck up"in paragraph 3 mean_________?
A．圍堵B．討好C．釋放D．吸收
小題3:Some desert animals have extra big eyes or ears because__________.
A．the sunlight is too strong in the dayB．they need to see and hear well at night
C．it is very cold at nighD．they store water in them.
小題4:Most desert animals stay cool in the day by_________.
A．storing water in side their bodiesB．drinking water as much as they can
C．staying undergroundD．growing lots of plants
小題5:Which of the following is true?
A．Desert people like to live in the desert though life is hard.
B．People in the desert usually fry eggs on the ground.
C．Camels have special fur to store water.
D．All the deserts are covered in sand.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解


Look at the paper in the picture carefully. Is there anything different from your notebook paper? This kind of paper feels as soft as your notebook paper. It’s also easy to write on. But do you know, this kind of paper is made from stone?
As we know, stone is easy to get on the earth, so it’s cheap. And the stone paper is about 20% to 30% cheaper than ordinary paper. The stone paper causes little pollution and helps protect the environment, because it makes tree and water free. The following table shows what is needed to make one ton of stone paper and one ton of ordinary paper. 
Ingredients
(成份)
One ton of
Trees
Water
Bleach
(漂白劑)
Stone
Additives
(添加劑)
Stone paper
No
No
No
0.8 ton
0.2 ton
Ordinary paper
5 tons
72 M3
Yes
0.2-0.3 ton
0
 
Now in Beijing, some students begin to use stone paper to do their homework. And during the two sessions (兩會) in 2011, stone paper was also used.
小題1:Stone paper is ______________.
A．cheapB．difficult to write onC．not softD．bad
小題2: We need  _______________ ton of stone to make one ton of stone paper..
A．0.8B．0.3C． 0.2 D．0.25
小題3: ________________in Beijing begin to use stone paper to do their homework.
A．All the studentsB．Some studentsC．Many studentsD．Nobody

查看答案和解析>>

科目：初中英語 來源：不詳 題型：完形填空

Have you heard of this story? On July 11th every year, a local office of Project Hope (希望工程) receives a donation from a person called Xu Qin.          people later know that Xu Qin died          July 11th, 1994.
Xu Qin was Liu Wenzhen’s youngest         . Liu Wenzhen has been in the habit of making a donation to Project Hope on that day. Mrs. Liu doesn’t think her donation is a great thing. She is        helping to make her daughter’s dream come true. “ I always dream of          a teacher in the countryside because that is where my father’s home is,” said Xu Qin when she was         .
Project Hope is built to help more poor children be able to go to school. In China, the project             in 1985. Over the last twenty-two years it has helped millions of children to go to school.
As a student, we can also do something to support that project. We may save our pocket money and donate         to Project Hope. Maybe we can help those children who can’t go to school to get some            . We can also call on            to do something for the project.
小題1:
A．AndB．ButC．SoD．Or
小題2:
A．onB．inC．a(chǎn)tD．to
小題3:
A．sonB．daughterC．teacherD．friend
小題4:
A．a(chǎn)lsoB．stillC．onlyD．probably
小題5:
A．realizingB．comingC．gettingD．becoming
小題6:
A．livelyB．a(chǎn)liveC．youngD．old
小題7:
A．succeededB．producedC．ended D．started
小題8:
A．themB．onesC．itD．one
小題9:
A．moneyB．foodC．educationD．culture
小題10:
A．otherB．the otherC．othersD．a(chǎn)nother

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Read how Sofia writes a composition.




1.The weekend before she has to give it to the teacher, she sits on her own in the kitchen. First, she looks at the title and thinks a lot.
2.Then she writes a few ideas onto a piece of paper, in no particular order. She looks up a couple of words in the dictionary and writes those down.
3.Then she has a sandwich and goes to watch TV.
4.The next day she looks at what she wrote. She adds some more ideas. Then she decides how to order her ideas. She starts to write.




5.There are some words she’s not sure about so she looks them up in her dictionary.
6.When she has finished writing, she reads carefully through her composition. She crosses some things out and changes one or two sentences.
7.Then she looks back at her notes from other written work. She makes sure she hasn’t made any of the same mistakes.
8.Finally, she writes out her composition onto a clean piece of paper and puts it in her bag.
180words
小題1:What does Sofia do first before she writes the composition?
A．She looks at the title and thinks a lot.
B．She has a sandwich and goes to watch TV.
C．She writes a few ideas onto a piece of paper.
D．She looks up a couple of words in the dictionary.
小題2:When she meets some words she’s not sure,        .
A．she writes them downB．she looks back at her notes
C．she crosses some things outD．she looks them up in the dictionary
小題3:From the passage we can know Sofia is a        .
A．driverB．doctorC．studentD．parent

查看答案和解析>>

同步練習(xí)冊答案