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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
2025-04-05
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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项“波动,变动,起伏现象”;B项“显示,表现”;C项“倾向,素质,易染病体质”;D项“里程碑,时间表”。句意为:某些生物学家指出,每种特定的人类特征都是逐渐地、不规则地产生的,因此,很难分离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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