If you get lost, this is what you should do. Sit down and stay where you are. Don’t try to find your friends—let them find you. You can help them find you by staying in one place. There is another way to help your friends or other people to find you. You can shout or whistle (吹口哨)three times. Stop. Then shout or whistle three times again. Any signal(信号)for three times is a call for help.
Keep up shouting or whistling. Always three times together. When people hear you, they will know that you are not just making a noise for fun. They will let you know that they have heard your signal. They will give you two shouts or two whistles. When a signal is given twice, it is an answer to a call for help.
If you don’t think that you will get help before night comes, try to make a little house with branches(树枝. Make yourself a bed with leaves and grass.
When you need some water, you have to leave your little branch house to look for it. Don’t just walk away. Pick off small branches and drop them as you walk in order to go back again easily. When you are lost, the most important thing to do is to stay in one place.
【小题1】If you get lost in the forest, you should___________.            

A.try to find your friendsB.stay in one place and give signals
C.walk around the forestD.shout as loudly as possible
【小题2】Which signal is a call for help?    
A shouting here and there         B. shouting or whistling three times together
C. crying twice                   D. whistling every where in the forest
【小题3】When you hear two shouts or two whistles, you know that_____.
A.someone is afraid of an animalB.people will come to help you
C.someone needs helpD.something terrible will happen
【小题4】What’s the meaning of the underlined sentence?(划线句子)
A.Drop branches to find your way back
B.Pick off branches to build another house
C.Use branches to make a bed
D.Drop branches to look for water
【小题5】The main(主要的)idea of the passage is_____________.
A.how to travel in the forest
B.how to spend the night in the forest
C.what you should do if you want to get some water
D.what you should do if you are lost in the forest

Germs(细菌) 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(免疫系统) protects you, too. When germs get inside your body, your immune system finds and kills them. Special cells(细胞) move around your body and fight germs. They help you stay healthy. Other cells make antibodies(抗体). 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 

 

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