13.495精确到百分位是______，保留整数是______．
（1）13.495≈13.50；
（2）13.495≈13；
故答案为：13.50，13．
福禄倍尔论述的教育原则主要有两点，即（）、教育适应自然的原则。
— Could you tell me _____?
— I’m sorry. The traffic was too heavy.
A. why were you late for the meeting
B. why you were late for the meeting
C. when you were late for the meeting
