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问题: 啊啊啊~一个选择题啊!

However,they persevered and their bone structure gradually became_______to the new and unstable position.
A.adapted
B.accustomed
答案是A
B为什么不行?

解答:

纸上谈兵说的不错,这里进一步解释一下。还是先看看这两词作为形容词时英文的说明:
adjective:
Customary; usual; habitual

Adapted:
changed in order to improve or made more fit for a particular purpose

可看出accustomed只是表示“习惯的”, 而adapted则表示作出某种变化以适应新的情况;此题中说“它们(古猿)的骨骼渐渐适应了……”,故选adapted为正确答案。