单选题 When the female emperor moth emits her sexual odors, the male, with his large sensitive antennae, can detect her from as far away as five kilometers.
【正确答案】 B
【答案解析】A选项fragrance意为“芳香，芬芳”；B选项smell意为“嗅觉，气味”；C选项pinnacle意为“顶峰，尖顶”；D选项charm意为“魅力，魔力”。odor意为“气味，名声”，与B选项同义，故选B。本句大意为：当雌帝蛾散发出性气味时，长着巨大而敏感的触角的雄帝蛾在5公里外就能察觉到。