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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-usi

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问题    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, and language. One of the most striking ways
in that chimpanzees biologically resemble humans lies ill the    【M1】______
structure of their trains. The chimpanzee, with the capacity for primitive
reasoning, exhibits a type of intelligence like that of humans than 【M2】______
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 of the first ape man.     【M3】______
   In a long time, the fact that prehistoric people made tools was【M4】______
considered to be one of the major criterion distinguishing them from【M5】______
other creatures. It is true that the chimpanzee does not fashion tools        
to "a regular and set pattern" but then, prehistoric people, after【M6】______
their development of 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 most people’s minds of  【M8】______
tools with humans that special attention has always been focused upon
any animal able to use an objective as a tool; but it is important【M9】______
to realize that this ability, on its own, does not necessarily indicate
any special intelligence in the creature concerning.       【M10】______
【M7】
选项
答案too改成either
解析 副词错误。因为句中有unlikely一词，所以该句应用either。too一般用在肯定句中。
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