11．According to the passage，what would happen to us without communication?
A．We should learn everything for ourselves．
B．We would become unable to speak．
C．We couldn’t live happily。
D．We might have to do everything by ourselves．
12.What does the passage say about animals’ communication？
A．They have their advanced language in form of sound
B．They can express simple feelings such as hunger and pain．
C，Some of them can communicate with people very well
D．All of them can use sound to express themselves．
13．Which of the following statement is true？
A．Humans do not have adequate knowledge ab
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