假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌系的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（ ）划掉。

修改：在错的词下划一横线（   ），并在该词下面写出修改后的词。

注意：1.每处错误及修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

My father took me out camping for the first time when I was seven. He wanted teach me about animals, insects and trees. My uncles all come along with bows and arrows for hunting.

One evening at sunset, we sat by the fire, have our barbecue. Just then a bird was flying over us. My uncles immediate jumped up and shot their arrows on the bird. Neither of the arrows hit the target. Suddenly the arrows was flying down at us from the sky — they were looked like rain! We ran to escape but fortunately no one was injured.

That day I didn’t learn much about animals, insects or trees, but I learnt a impressive lesson about gravity!

主宰人体生长发育的物质是（）

A．肾精 

B．肾气 

C．天癸 

D．元气