The amazing success of man as a【C1】________is the result of the evolutionary development of our brains which has【C2】________, am

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问题     The amazing success of man as a【C1】________is the result of the evolutionary development of our brains which has【C2】________, among other things, to tool-using, tool-making, the ability to solve problems by logical【C3】________, thoughtful cooperation, and language. One of the most striking ways【C4】________chimpanzees biologically resemble humans【C5】________the structure of their brains. The chimpanzee, with his【C6】________for primitive reasoning, exhibits a type of intelligence more like【C7】________of humans than does any other【C8】________living today. The brain of the modern chimpanzee is【C9】________not too dissimilar to the brain that so many millions of years ago directed the【C10】________of the first ape man.
    For a long time, the fact that【C11】________man made tools was considered to be one of the major criteria to【C12】________them from other creatures. It is true that the chimpanzee does not fashion his【C13】________to a regular and set pattern—but then, primitive man, 【C14】________development of stone tools, undoubtedly poked around with sticks and straws, at which【C15】________it seems unlikely that he made tools to a set pattern【C16】________.
    It is because of the close【C17】________in most people’s minds of tools with man【C18】________ special attention has always been【C19】________upon any animal able to use an object【C10】________a tool; but it is important to realize that this ability, on its own, does not necessarily indicate any special intelligence in the creature concerned.
【C9】

选项 A、like
B、maybe
C、perhaps
D、probably

答案D

解析 根据上文的“黑猩猩大脑结构跟人类相似”,推断现代黑猩猩的大脑跟几百万年以前类人猿的大脑差异不大的可能性较大,probably表示很肯定猜测,故选D项。maybe只能用于句首;perhaps表示推测的可能性不大。
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