阅读短文，回答问题

I'm David. This is our classroom. It's a nice and big room. The walls（墙）are white and the windows are big. A big blackboard（黑板）is on the wall. A clock is on the wall, too. Forty students are in our class. So we have forty sets of desks and chairs in the classroom. Look at our English teacher, Ms. Wang. She is a good teacher. We all like her very much. What is on her desk? Some red flowers (花)are on it. They are nice.

Welcome to our classroom.