A．They can remind each other of different stages of their marriage.
B．They can say something more sentimental in the letters.
C．They prefer the form of writing instead of speaking to show love.
D．They have kept it as a tradition for a long time.
A．It wastes people too much time.
B．It costs people too much money.
C．It distracts people from what really matters.
D．It makes people become more materialistic.