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| 文章出处：学生大考试站 发布时间：2005-10-12 |
se strengt h, speed and claws ( 27 ) an impressive ’small fire’ weaponry . They could not even defend themselves ( 28 ) runnin g swiftly like the horses, zebras or small animals. If the ape-men h ad attempted to compete on those terms in the open, they would have been ( 29 ) to failure and extinction. But they were (30) with enormous concealed advantages of a kind not possessed by any of the ir competitors.
In the search ( 31 ) the pickings of the forest, the ape-men had ( 32 ) efficient stereoscopic vision and a sense of colour that the animals of the grasslands did not possess. The abili ty to see clearly at close range permitted the ape-men to study practical proble ms in a way that lay far ( 33 ) the reach of the original inh abitants of the grassland. Good long-distance sight was ( 34 )
another matter. Lack of long-distance vision had not been a problem for fores t-dwelling apes and monkeys because the higher the viewpoint, the greater the ra nge of sight—so ( 35 ) they had had to do was climb a tree. Out in the open, however, this simple solution was not ( 3 6 ) . Climbing a hill would h
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