根据短文内容，从A、B、C、D四个选项中选取正确答案填空。

A

    Two students of the World Wide Friends Club write to their friends on the Internet.

    Hello, friends! My 1 is Andy. I have black hair and I 2 glasses. My friends say I am cool with them. I am in 3 this year. I like all my lessons, 4 I'm not good at Maths. I love football very much. I often play football with my classmates. 5 are all nice. I love them.

    Hi, I 6 Mary. I study at a middle school. I am thirteen years old. I 7 black hair and brown eyes. This is my classroom. There are 50 small 8 and chairs in it. On the back wall (墙)9a kite. It is my work. On the teacher's desk, there are some flowers. They are 10 our teachers. My classroom is a big and nice room.

侏儒症          ____ A脖子粗大

甲亢            ____ B尿液中糖多

地方性甲状腺肿  ____ C身材矮小‘智力正常’

糖尿病          ____ D代谢亢进

巨人症          ____ E身材高大

“山上多植树，胜似修水库，有雨它能吞，无雨它能吐”，这条谚语形象地说明森林对环境的作用是（　　）