2. 职称英语
  3. Our ape-men forefathers had no obvious natural weapons in the struggle for s

Our ape-men forefathers had no obvious natural weapons in the struggle for s

游客2023-12-30  46
问题     Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the open. They had neither the【C1】________teeth nor the strong claws of the big cats. They could not【C2】________with the bear, whose strength, speed and claws【C3】________an impressive "small fire" weaponry. They could not even defend themselves by running【C4】________like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been【C5】________to failure and extinction.
    But they were【C6】________with enormous concealed advantages of a kind not possessed by any of their competitors. In the search【C7】________the pickings of the forest, the ape-men had【C8】________efficient stereoscopic vision and a sense of color that the animals of the grassland did not possess. The ability to see clearly at close【C9】________permitted the ape-men to study practical problems in a way that lay far【C10】________the reach of the original inhabitants of the grassland.
    Good long-distance sight was【C11】________another matter. Lack of long-distance vision had not been a problem for forest-dwelling apes and monkeys because the higher the【C12】________the greater the range of sight, so all they had to do was climb a tree out in the open. However, this simple solution was not【C13】________Climbing a hill would have helped, but in many【C14】________the ground was flat. The ape-men【C15】________the only possible solution. They reared up as high as possible on their hind limbs and began to walk upright. This vital change of physical position brought about【C16】________disadvantages. It was extremely【C17】________and it meant that the already slow ape-men became slower still. 【C18】________, they persevered and their bone structure gradually became【C19】________to the new, unstable position that【C20】________them the name Homoerectus, upright man. [br] 【C18】
选项 A、However
B、Therefore
C、Meanwhile
D、Subsequently
答案 A
解析 however意为“可是，仍然”，表转折关系；therefore意为“因此，所以”，表因果关系；meanwhile意为“其间”，表时间关系；subsequently意为“后来，随后”，表承接关系。根据上下文可知，此句与上句之间在语义上为转折关系，故选A。
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