人们要想更好地认识世界和改造世界就必须学好哲学。哲学是[ ]
A、科学之科学
B、具体科学知识的基础
C、关于世界观的学说
D、具体科学知识的总和
答案：C
Mary and I talked _____ at the beginning of term. _____ we started talking, I knew we would be friends.[ ]
A. the first time, For the first time
B. for the first time, The first time
C. for the first time, For the first time
D. the time, For the first time
已知水准高程和实测水准点高程相比较之差值，称闭合差。
