单项选择题 根据法的创制方式和表现形式,可以将法分为根本法和普通法。( )

单项选择题 听力原文：Why was Mr. Jackson late for the conference?(A) The conference was postponed.(B) He had to take his son to the hospital.(C) At 1:30 at the latest.(14)A． B． C．

单项选择题 关于等成本线,错误的说法是( )。