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  3. Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the strong claws of the big cats. They ha

Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the strong claws of the big cats. They ha

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问题 Our ape-men forefathers had no obvious natural weapons in the
struggle for survival in the strong claws of the big cats. They had neither the
powerful teeth nor the strong claws, and could not rival with the bear,
whose strength and speed provided an impressively "small-fire" weaponry.                【S1】
They could not even defend themselves by running swiftly like horses. If the
ape-men attempted to compete on those terms in the open, they would have                 【S2】
been doomed to failure and extinction. But they were born with enormous concealing       【S3】
advantages of a kind not possessed by any of its competitors.                            【S4】
In the search for the pickings of the forest, the ape-men were developed                 【S5】
efficient short-distance vision and a sense of color that the animals of the
grasslands did not possess. The ability to see dearly at dose range permitted
them to study practical problems in a way that lay far from the reach of                 【S6】
original inhabitants of the grassland. Good long-distance sight was another
matter. Lack of short-distance vision had not been a problem for forest-                 【S7】
dwelling apes and monkeys because of the higher the viewpoint, the greater               【S8】
the range of sight. So everything they had to do was climb a tree. But out               【S9】
in the open this simple solution was available. Climbing a hill would have               【S10】
helped, but in many places the ground was flat. The ape-men had only                     
选项
答案impressively 改为 impressive
解析 同源形容词与副词混淆。impressive “small-fire” weaponry令人印象深刻的小火力武器，其中impressive修饰名词weaponry。
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