【正确答案】 D

【答案解析】abnormal：不正常的。unusual：不平常的。He is a scholar of unusual ability．他是个有非凡才能的学者。bad：坏的，不好的。Smoking is certainly bad for your health．抽烟有害你的健康。frightening：惊吓的。It was a very frightening experience but every one of us was courageous．这是一个令人害怕的经历，不过，我们每个人都很勇敢。repeated：重复性的。 John apparently did not return the money, despite repeated reminders．尽管不断给约翰送去催单，显然他还没有还钱。