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  3. Some biologists argue that each specifically human trait must have arisen gradua

Some biologists argue that each specifically human trait must have arisen gradua

游客2025-03-30  20
问题 Some biologists argue that each specifically human trait must have arisen gradually and erratically, and that it is therefore difficult to isolate definite______in the evolution of species.
选项 A、fluctuations
B、manifestations
C、predispositions
D、milestones
答案 D
解析 本题考查名词辨析。A波动，变动，起伏现象；B显示，证明；C倾向，素质，易染病体质；D里程碑，时间表。句意为：某些生物学家指出，每一种特定的人类特征都是逐渐地、不规则地产生的，因此，很难孤立出物种进化过程中明确的(重大标记)。因此答案为D选项。
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