生态农业具有“经济、环保、高效”等优点，发展生态农业是实现农业可持续发展的有效途径，如图是一个生态农场模式图，请据图回答问题：

把下列加下划线字的音节补充完整。

已知空间四边形ABCD中，M、G分别为BC、CD的中点，则 $\overrightarrow{AB}$ + $\frac{1}{2}$ （ $\overrightarrow{BD}+\overrightarrow{BC}$ ）等于（  ）

从方框中选择适当的单词完成短文。

   What's this on the table? It is a ____  of my new classroom. ____  at the picture. ____  can you see ____  the classroom? I can see a ____  desk in the front of the classroom. Some books are ____  the desk. I can see two white ____ , too. There are____  colored chalks (彩色粉笔n them. ____  is the broom (扫帚)? It’s ____  the door. I like this new classroom.