I have a new schoolbag. It is beautiful. It is yellow and blue. I like it vey much. But my schoolbag is very heavy. There are many things in my schoolbag. Look, what's in it?

    I have two books, a notebook, four pencils, two crayons, a ruler, and an apple in my schoolbag.

根据课文内容回答问题，将问题的答案填写在横线上。

Parents will __________ their children __________ making friends when they reach fourteen or fifteen.

今天全世界通用的纪年法是公元纪年，你知道这与传说中的哪一历史人物有关(    )       

动物与植物最显著的区别是（　　）