单项选择题 Though （） in his youth, Muir grew in the fullness of time to acquire truly （）habits envied by even the most hardened of his fellow survivalists.

单项选择题 Despite certain （）habits of the North American screech owl, it performs the majority of its hunting alone, in alpine forests, unfettered by （）

单项选择题 Regardless of the （） he evinces, especially when articulating his purportedly innate affinity for tennis, he is nevertheless a less than （） player once actually the court.