[单项选择] Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the open. They had neither the powerful teeth nor the strong claws of the big cats. They could not (1)_______with the bear, whose strength, speed and claws (2)_______ an impressive "small-fire" weaponry. They could not even defend themselves (3)_______running swiftly 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 (4)________to failure and extinction. But they were (5)_______with enormous concealed advantages of a kind not possessed by any of their competitors. In the search (6)_______the pickings of the forest, the ape-men had (7)_______efficient stereoscopic vision and a sense of colour that the animals of the grasslands did not possess. The ability to see clearly at close range permitted the ape-men to study practical problems in a way that lay far (8)________the reach of the original inhabitants of the gra
A. accustomed
B. familiarized
C. adapted
D. suited

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