For how long can a reader keep the book before he renews it

A．Because each nation wants to keep its characteristics.
B．Because they are designed by different artists from eight countries.
C．Because it will enable the blind to distinguish between them easily.
D．Because Denmark and other countries want to have their own coins.

A．the shooting of birds by hunters.
B．the whole process of taking pictures.
C．pictures taken at random.
D．pictures that were taken after careful preparation.