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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2024-01-10  60
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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