2. 外语
  3. Some biologists argue that each specifically human trait must have arisen gradually and erratically, and that it is therefore di

Some biologists argue that each specifically human trait must have arisen gradually and erratically, and that it is therefore di

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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 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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