题目

淮安市南陈集中学2010-2011第一学期期中教学调研高一英语试题.do   The girl looked at me with a _______ expression. Maybe the problem was quite _______. A. puzzled; puzzling   B. puzzling; puzzled   C. puzzled; puzzled    D. puzzling; puzzling 答案：ckdaA下列物理量中，属于矢量的是A. 动能 B. 功 C. 向心加速度 D. 重力势能