根据句意和首字母提示完成下列句中的单词。

1. His sister eats lots of h_________ food.

2. They like hamburgers for l_________.

3. I don't like milk for b_________.

4. He doesn't like b_________,but he likes pears.

5. Here is a p_________ of my family.

6. My sister and I like p_________ tennis.

7. Tom h_________ a soccer ball.

8. He eats two eggs f_________ breakfast.

9. Do you like to eat French f_________?

简述遗传和环境对人的发展的影响及关系。