12．Many animals use some kinds of"language（语言）"．They use signals（信号）and the signals have meanings（意思）．For example，（45）C a bee finds some food，it goes （46）D its home．（47）A is difficult for a bee to tell （48）C bees where the food is by speaking to them，but it can do a little dancing．This tells the bees where the food is and （49）B it is．
Some animals show（50）C they feel by making sounds．It is not difficult to tell if a dog is angry because it barks（吠）．Birds make some different sounds and （51）A has its meaning．Sometimes we humans（人类） make sounds in the same way．We （52）Asounds like"Oh"to show how we feel about （53）B or when something falls（掉） onto our （54）A
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Some animals show（50）C they feel by making sounds．It is not difficult to tell if a dog is angry because it barks（吠）．Birds make some different sounds and （51）A has its meaning．Sometimes we humans（人类） make sounds in the same way．We （52）Asounds like"Oh"to show how we feel about （53）B or when something falls（掉） onto our （54）A
| 45．A．because | B．before | C．when | D．as |
| 46．A．out of | B．back from | C．away from | D．back to |
| 47．A．It | B．This | C．That | D．He |
| 48．A．each other | B．another | C．other | D．others |
| 49．A．how long | B．how far | C．how many | D．how old |
| 50．A．why | B．which | C．how | D．what |
| 51．A．each | B．every | C．all | D．some |
| 52．A．make | B．give | C．talk | D．speak |
| 53．A．everything | B．something | C．nothing | D．anything |
| 54．A．feet | B．hands | C．face | D．mouth． |