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

游客2024-01-10  10

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 the species.

选项 A、fluctuations
B、generations
C、predispositions
D、milestones
E、manifestations

答案 D

解析 -方程等号:therefore表示因果,前后同义重复。difficult是负向词,取反。
-强词和对应:gradually或erratically指向空格,根据difficult可知空格取反。fluctuation波动,generation一代,predisposition倾向,milestone里程碑、重要时刻,manifestation显示。milestone的释义为:a significant point in development,描述的是“点”,和gradually(逐渐地)的时间段取反。答案选D。
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