A Is it solving the problem by waking its master or is it simply barking instinctively because it is afraid?
B Chimpanzees can solve certain problems without any help.
C Some animals seem able to do this.
D In all these cases we may say that an animal is using intelligence.
E In other words， he did not simply use a tool， which itself is intelligent: he made a tool.
F They do not remember places and directions and then make decisions.