The text mainly tells us about

A．By culture the author means something that people have in common in relation to their ideas, art, or their way of life.
B．All animals are found to have the same culture as human beings.
C．The ability to use tools used to serve as a dividing line between human beings and animals.
D．Many things that animals used to be considered unable to do are now proved possible.

A．Animals don't have the intelligence that man has.
B．Animals can hardly express what they want.
C．Animals can only use sign language for their communication.
D．Animals can not speak the same way as man does.