（ ）是指由小学、中学到大学为统一的直线系统，上下衔接，形成由下而上的连续阶梯的学制。

(单选题)These books were very dear to him and he bought them at ____ (单选题)Which of the following underlined is different in pronunciat (单选题)______ of the land in that area ______ covered with trees an (单选题)—Sir, could you please put out your cigarette. This is a smo (单选题)—How dangerous it was!—Yes, but for the passer-by’s quick ac (单选题)He made a promise ______ he earned money, he would build a n (单选题)British people say “please” and “Thank you” all the time ___ (单选题)______ a child and you will find that he is happy every day (单选题)The proposal ______ at the meeting now is of great importanc (单选题)______ the blueprint into reality will be a new Long March.