B

阅读材料，选择正确的答案。
() 1. What's on the first floor?
A. A library.
B. A classroom.
C. A music room.
() 2. Which picture may Tim send(发送)?
A.
B.
C.
() 3. Where is the art room?
A. On the second floor.
B. By the computer room.
C. Under the computer room.
() 4. What are they talking about?
A. Tim's new school.
B. Tim's new classroom.
C. Tim's new classmate.

1. A
2. C
3. B
4. A

1. 根据左侧对话“Is there a library? Yes, it's on the first floor.”可知，图书馆在一楼，故选A。
2. 右侧对话中，Tim和Jane讨论了电脑室，结合选项图片，C是电脑室的图片，所以Tim可能发送这张图，故选C。
3. 根据右侧对话“Where's the computer room? It's by the art room.”可知，美术室在电脑室旁边，故选B。
4. 根据对话开头“Jane, this is my new school.”以及后续围绕学校各房间的讨论，可知他们在谈论Tim的新学校，故选A。