语法与词汇 15.Certain animal behaviors, such as mating rituals, seem to be______, and therefore unaffected by external factors such as climate changes, food supply, or the presence of other animals of the same species.
【正确答案】 B
【答案解析】本题考查形容词辨析。空后的therefore提示前后两个分句为因果关系,前因后果。根据unaffected by external factors(不受外部因素的影响)判断,innate(天生的,固有的,天赋的)符合语义,故答案为[B]项。learned意为“后天的,通过学习(或经验)获得的”。intricate意为“复杂精细的,错综复杂的”。specific意为“特定的,特有的;明确的,具体的”。