单选题 Certain animal behaviors, such as mating rituals, seem to be ______, and therefore ______ extemal 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】learned…immune to“学到的……不受感染”；innate…unaffected by“先天的…… 不受影响”；intricate…belong to“复杂的……属于”；specific…confused with“特定的……混 淆”。根据句意和各个选项的意思可知，正确答案是B。