完形填空。 Many animals use some kind of “language”.  They use signals(信号)and the signals have meanings. For example, when a bee(蜜蜂) has found some food, it goes 1 home.  It is 2 for a bee to tell 3 bees where the food is by speaking to 4 ,but it can do a little dancing. This tells the bees where the food is and 5 it is. Some animals show how they feel by sounds.  It is not difficult to 6 .  If a dog is angry, it barks(吠).  Birds make several different sounds and 7 has its own meaning.  Sometimes we humans make sounds 8 .  We make sounds like“Oh!”or“Ouch!”to show how we feel about something or when we 9 something on our feet. We humans have languages.  We have words.  These words have the meaning of things,actions(行动), feelings or ideas.  We 10 give each other information.  Writing down words, we can remember what has happened or send messages to people far away. (     )1. A. out of (     )2. A. important (     )3. A. each other (     )4. A. it (     )5. A. how long (     )6. A. watch (     )7. A. each (     )8. A. in the same sound (     )9. A. put (     )10. A. could B. on with B. difficult B. another B. him B. how far B. see B. every B. by different sounds B. drop B. are able to C. away from C. necessary C. other C. them C. how many C. look C. all C. in the same way C. fall C. couldn’t D. back D. impossible D. others D. themselves D. how old D. tell D. some D. by different ways D. set D. be able to