精品一区二区免费在线观看_国产精品久久久久久av福利软件_97成人精品区在线播放_国内成人精品一区

Animals, including insects, don’t have a ‘language’ like ours. They do not ‘talk’ to each other in words and sentences. But if we watch them, we can see that they do have their ways of communicating (交流) with each other.

Can you see the rabbit’s tail? When rabbits see this white tail moving up and down, they run away. They know that they are in danger. The rabbit has told them something without making a sound. It has given them a signal.

Many other animals use this kind of ‘language’. When a cobra（眼鏡蛇）is angry, it raises its head and makes itself look powerful（有力的）. This warns other animals. When a bee（蜜蜂）has found food, it goes back to its home. It cannot ‘tell’ the other bees where the food is by speaking to them, but it does a little dance. This tells the bees where the food is.

Some animals ‘say’ things by making sounds. A dog barks, for example, when a stranger comes near. A cat purrs when it is pleased. Some birds make several different sounds, each with its own meaning. Sometimes we human beings speak in the same way. We make sounds like “Oh” or “Ah” when we are frightened or pleased or when we drop something on our toes.

1.Which one is TRUE according to the passage?

A．Animals have languages like human beings.

B．Bees communicate with each other by dancing.

C．Animals can use words.                                                 D．Animals are brave.

2.A rabbit uses its tail to ___________.

A．warn other rabbits when they are in danger   B．tell other rabbits where food is

C．make itself look powerful                 D．help it to run fast

3.When a cobra is angry, it __________.

A．makes a loud noise                      B．raises its head

C．moves up and down                     D．does a little dance

4.Several different sounds can be made by a __________.

A．rabbit            B．bee              C．bird              D．fish

5.From the passage, we know that ________ use words and sentences to express ideas and thoughts.

A．a(chǎn)ll living things      B．a(chǎn)ll animals         C．some birds        D．human beings

Germs(細(xì)菌) are everywhere. You can’t see them, but they are on your desk, on your computer, and even in the air!
Like people, germs move around the world. They fly with us on planes. When food, clothes, and other things travel around the world, germs travel, too. Some germs are safe, but some are dangerous. Germs cause illnesses like colds and the flu.
Warmer Weather Brings Germs  
The world’s weather is changing. Cooler countries are getting warmer, so insects from hot countries can move there. Some of these insects, like mosquitoes, carry dangerous germs. These germs cause headaches, fever, and can even kill people.
Under Your Skin
Your skin protects you from germs. It stops some germs, but not all. They can enter your body when you eat, or when you have a cut. Germs are on your hands, too. They enter your body when you touch your eyes, nose, or mouth.
Fighting Germs
Your immune system(免疫系統(tǒng)) protects you, too. When germs get inside your body, your immune system finds and kills them. Special cells(細(xì)胞) move around your body and fight germs. They help you stay healthy. Other cells make antibodies(抗體). Antibodies help your body find and stop germs.
What can you do to fight germs? You should wash your hands with soap and water. Soap kills many germs, and water washes them away.
【小題1】According to the text, insects ______.
A. kill germs               B. carry germs              C. protect germs   
【小題2】The underlined word “there” refers to ______.
A. cooler countries         B. hot countries          C. the world
【小題3】Which of the following is right according to the text?
A. All germs are dangerous.
B. There are more germs in cold places.
C. Germs can get into your body.
【小題4】What do antibodies do?
A. They get inside your body and kill your immune system .   
B. They carry dangerous germs. 
C. They help protect us from germs.   
【小題5】Which can be the best title for this text?
A. Germs Are Everywhere B. Weather Is Changing     C. Skin Stops Germs 

Germs(細(xì)菌) are everywhere. You can’t see them, but they are on your desk, on your computer, and even in the air!

Like people, germs move around the world. They fly with us on planes. When food, clothes, and other things travel around the world, germs travel, too. Some germs are safe, but some are dangerous. Germs cause illnesses like colds and the flu.

Warmer Weather Brings Germs  

The world’s weather is changing. Cooler countries are getting warmer, so insects from hot countries can move there. Some of these insects, like mosquitoes, carry dangerous germs. These germs cause headaches, fever, and can even kill people.

Under Your Skin

Your skin protects you from germs. It stops some germs, but not all. They can enter your body when you eat, or when you have a cut. Germs are on your hands, too. They enter your body when you touch your eyes, nose, or mouth.

Fighting Germs

Your immune system(免疫系統(tǒng)) protects you, too. When germs get inside your body, your immune system finds and kills them. Special cells(細(xì)胞) move around your body and fight germs. They help you stay healthy. Other cells make antibodies(抗體). Antibodies help your body find and stop germs.

What can you do to fight germs? You should wash your hands with soap and water. Soap kills many germs, and water washes them away.

1.According to the text, insects ______.

A. kill germs               B. carry germs              C. protect germs   

2.The underlined word “there” refers to ______.

    A. cooler countries         B. hot countries            C. the world

3.Which of the following is right according to the text?

A. All germs are dangerous.

B. There are more germs in cold places.

    C. Germs can get into your body.

4.What do antibodies do?

    A. They get inside your body and kill your immune system .   

B. They carry dangerous germs. 

C. They help protect us from germs.   

5.Which can be the best title for this text?

    A. Germs Are Everywhere B. Weather Is Changing      C. Skin Stops Germs 

It is said that another acre of the world’s forest will be destroyed forever. Why is this happening? There are two reasons — land and wood. In many countries the trees have been cut down because the land was needed for animals or crops. In other parts of the world the trees are cut down because their wood is wanted. This wood is used by local people for firewood or it is used for building. But many people don’t know that in most places the trees won’t be replaced. The soil in the forests is very thin, but it is protected by the trees. When the trees are cut down, the soil is washed away by the rain or blown away by the wind. Soon nothing can be grown on it. The  forest becomes a desert. Then more land will be needed, and more trees will be cut down.
When the forest is destroyed, it isn’t only the trees that are lost — the homes of millions of animals and plants are destroyed, too. All kinds of animals are in danger — fish，reptiles, birds, mammals, insects, and shellfish — as well as thousands of plants.
Who is to blame for this? The answer is simple: all of us. There are just too many people in the world. The world’s population is now six billion. Of course, it’s very easy to blame the local people. We don’t cut down trees. They do. But the products are bought by people like you and me — wood houses, beds, tables, chairs, paper… Why are the forests being destroyed? Just look around. You are probably using it right now.
【小題1】People cut down large areas of trees in order to _________.