题目

 Jane has been so ________ to getting used to everything that she hasn’t had time for social activities. A. confused              B. worried                C. devoted               D. based 答案：C质量相同的下列单质分别与足量的氧气反应，消耗氧气最多的是 [　　] A．铝B．硫 C．磷D．碳