Read and choose读句子，选择适当的词填空，把序号填在题前括号内。
a: Yes, we do.
b: This is our classroom.
c: Forty.
d: Your school is cool.
e: Where is the canteen?
A: Welcome to our school. ____
B: How many students are there in your classroom?
A: ____
B: Do you have a library?
A: ____
B: ____
A: The canteen is on the first floor.
B: ____
满足条件
则
的最小值是（ ）
