根据短文内容，回答问题。

     Look! This is a picture of our classroom. There are fifty desks and chairs in it. They are for students.  

On the desks are our books. There is also a big desk in the classroom. It's for our teachers. Under the

teacher's desk, there are two basketballs and a football. We can play basketball and football after class.   What other things can you see? Yes, there are two maps on the wall, a map of China and a map of the

world. Our classroom is very nice. I like it very much.

1. Is this a picture of our school? 

    ________________________

2. How many students are there in our class? 

    ________________________ 

3. Is our teacher's desk big?

    ________________________

4. What are under the teacher's desk?

    ________________________

5. What are on the wall?

    ________________________

根据护坡做法的基本特点，护坡方式可分为植被护坡、（）护坡和截水沟护坡三种类型。