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The amazing success of humans as a species
is the result of the evolutionary development
of our brains which hassled to tool-using，
tool-making，the ability to solve problems by
logical reasoning，thoughtful cooperation，
CD6and language.One of the most striking ways
in that chimpanzees biologically resemble 【M1】______
humans lies in the structure of their trains.
The chimpanzee，with the capacity for primitive
reasoning，exhibits a type of intelligence like 【M2】______
that of humans than does any other mammal living
today.The brain of the modem chimpanzee is
probably not too dissimilar to the brain that
so many millions of years ago direct the behavior 【M3】______
of the first ape man.
In a long time，the fact that prehistoric 【M4】______
people made tools was considered to be one
of the major criterion distinguishing them 【M5】______
from other creatures.It is true that the
chimpanzee does not fashion tools to ’a
regular and set pattern’but then，prehistoric
people，after their development of 【M6】______
stone tools.
Undoubtedly poked around with sticks and
straws，at which stage it seems unlikely that
they made tools to a set pattern too.【M7】______
It is because the close association in 【M8】______
most people’s minds of tools with humans
that special attention has always been focused
upon any animal able to use an objective as a 【M9】______
tool；but it is important to realize that this ability，
on its own，does not necessarily indicate
any special intelligence in the creature concerning.【M10】______