题目

— What do you think about that new librarian?— She is ______of a good clerk, for she even doesn't know how to classify the books. A . somebody B . nothing C . something D . nobody 答案：B下列语句不正确的是( )A. 在同一平面内，过直线外一点有且只有一条直线与已知直线平行B. 两直线被第三条直线所截，如果同位角相等，那么两直线平行C. 两点确定一条直线D. 内错角相等