30个人围坐在一起轮流表演节目。他们按顺序从1到3依次不重复地报数，数到3的人出来表演节目，并且表演过的人不再参加报数，那么在仅剩一个人没表演过节目的时候，共报数多少人次？（ ）

(单选题)What do teachers think about teaching to the mandated state (单选题)What can be inferred about Erica at school? ( ) (单选题)The word “boomed” in the passage is closest in the meaning t (单选题)Why does the author mention practical inventions in paragrap (单选题)Which of the following can be inferred about Pennsylvania's (单选题)Which of the following best expresses the essential informat (单选题)According to paragraph 1. the U.S economy became the largest (单选题)关于敏捷软件开发中需要关注的风险，以下说法不正确的是（ ）。 (单选题)我国发布的第一个信息安全等级保护的国家标准GB 17859-1999，提出将信息系统的安全等级划分为（ ）个等级， (单选题)（ ）这一计算机软件著作权权利是不可以转让的。