8（）

单项选择题What is the main idea of the passage（）

A．There are many kinds of libraries.
B．A library is a place where books are stored.
C．Libraries provide entertainment.
D．Libraries offer many different services.

单项选择题What is the advantage for passengers who travel in a group of ten or more（）

A．They may buy the tickets direct from the on-board staff.
B．They will not pay for booking service.
C．They may get a discount.
D．They can pay in cash.