2. 外语
  3. A. probably B. plant C. reasoning D. ability E. stage F. species G. mammal H. di

A. probably B. plant C. reasoning D. ability E. stage F. species G. mammal H. di

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问题     A. probably        B. plant         C. reasoning        D. ability        E. stage
    F. species         G. mammal        H. differ           I. prehistoric    J. period
    K. contact         L. association   M. definitely       N. lies in        O. distinguish
    The amazing success of man as a【C1】________ is the result of the evolutionary development of our brains which has led, among other things, to tool-using, tool-making, the ability to solve problems by logical【C2】________. thoughtful cooperation, and language. One of the most striking ways in which chimpanzees biologically resemble humans【C3】________ the structure of their brains. The chimpanzee, with his capacity for primitive reasoning, exhibits a type of intelligence more like that of humans than does any other【C4】________ living today. The brain of the modern chimpanzee is【C5】________ not too dissimilar to the brain that so many millions of years ago directed the behavior of the first ape man.
    For a long time, the fact that【C6】________ man made tools was considered to be one of the major criteria to【C7】________ them from other creatures. It is true that the chimpanzee does not fashion his tools to a regular and set pattern—but then, primitive man, before his development of stone tools, undoubtedly poked around with sticks and straws, at which【C8】________ it seems unlikely that he made tools to a set pattern either.
    It is because of the close【C9】________ in most people’s minds of tools with man that special attention has always been focused upon any animal able to use an object as a tool; but it is important to realize that this【C10】________. on its own, does not necessarily indicate any special intelligence in the creature concerned.
【C8】
选项
答案E
解析 此处为定语从句，修饰表时间的before…of stone tools，因此空格处应填入表示时间的名词，词库中能表时间，且与at搭配的只有stage“阶段”。period“时期”为强干扰项，但该词常搭配during或in，故排除。
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