One day, Allan and his friend Henry went swimming in a river. It was very hot. How happy they were in the river! After they got out of the water, they played games in the sun for a while.
    On their way back, Henry saw some flowers. He liked flowers very much and ran into the green field to look at them. Now Allan was walking by himself.
    Then he heard Henry calling out, "A snake（蛇）! Help!..."
    "What's wrong with you?" asked Allan.
    "A snake bit（咬）me in the leg. Come here!"
    Allan ran over and saw a small red wound（伤口）on Henry' s leg.
    "The snake was in the grass. I didn't see it."
    "Sit down quickly"! Allan told Henry.
    Allan put his mouth at the little red wound and began to suck（吸）at it. In this way he saved （挽救）Henry's life. "Oh, Allan, it's very kind of you to help me."
    "That's all right. We are friends and we must always help each other."

社会主义制度经受严峻考验、显示出强大生命力的最可靠保证是 (     )

   When you write a letter or make a telephone call, your words 1a message. People communicate(沟通) with words. Do you think you can communicate2words? A smile3your face shows you are happy and friendly. Tears in your eyes tell 4that you are sad. When you 5your hand in class, the teacher knows you want to say something6ask questions. You shake（摇头） your head, and people know you are saying no. You nod（点头） and people know you are saying7.
   Other things can also give some information. For example, a sign at the bus stop helps you to know which bus  8. A sign on the wall of your school helps you to find the library. Signs on doors tell you  9to go in or out.10you ever noticed that there are a lot of signs around you and that you receive message11them all the time?
   People can communicate12many other ways.13artist can use his drawings to tell about beautiful mountains, about the blue sea and many other things. Books14 to tell you about all wonderful things in the world. They all help us to know 15 is going on in the world.