A.book language of behavior we learn |
B.the patterns of behavior we learn |
C.traditional ideas |
D.people’s habits |
A.cooperating with one another |
B.communicating with language |
C.using tools |
D.losing long teeth |
A.animals are the same as human beings |
B.animals can be as clever as human beings |
C.there is no differences between humans and other animals |
D.animals may have a culture like our own |
A.sure | B.unbelievable |
C.possible | D.important |
A.chimpanzees can learn to use sign language to make sentences |
B.other animals can invent tools |
C.knowledge and communication are no longer signs of only human behavior |
D.the line dividing human culture from animal culture is not as clear as we might think |