在下列命题中，真命题的是  （     ）

A

Sharon：Wow, Julie! Your room is great! Is your bed new?

Julie：Yes, it's new. It's from my aunt.

Sharon：Is your desk new? It's big.

Julie：No, it isn't. It is my brother's.He gave it to me.

Sharon：Why do you want a big desk? You don't do your homework in your room. You always do it in the classroom.

Julie：I know, Sharon. But my parents will give me a computer!

Sharon：A computer? Great. Oh, there are many books in your bookcase.

Julie：Yes. I am fond of reading.

Sharon：Where is your baseball?

Julie：I think it's in the desk. Oh, it's not here.

Sharon：Is it under your bed?

Julie：Oh, yes.

根据材料内容选择最佳答案。

按要求分类

充　　泳　　联　　旋　　剪　　粘　　囊　　棒   湖   超

左右结构：____　 ____　____　 ____  ____

上下结构：____　 ____  ____

半包围结构：____

左中右结构：____

A．天然气      B．沼气         C．木柴        D．____．