About ______ American homes have the habit of keeping pets.

A．Lowering a person's blood pressure.
B．Preparing a young couple for the responsibilities of parenthood.
C．Encouraging social relationships.
D．Indicating the owner's social status and wealth.

A．To make people realize that pets have a right to be treated well.
B．To offer care and adoption services for homeless and abused animals.
C．To buy health insurance for their pets.
D．To bury the pets in a respectable pet cemetery.