听下面一段独白，回答以下小题。
【小题1】What is the speaker mainly talking about?

A．A school library.

B．An online service.

C．A new organization.

【小题2】What can people do through BookCrossing?

A．Buy books.

B．Sell books.

C．Share books.

【小题3】How can members get information about the physical books?

A．By looking at an online list.

B．By making a phone call.

C．By sending an e-mail.

【小题4】Which color shows the number of books put over the last 30 days?

A．Red.

B．Yellow.

C．Blue.