[解析]
13.C 14.B
W:What a lovely dog!Is it your pet?
M:No,my sister Debby keeps it.We call it Evie.
W:How old is Evie?
M:Five years old.It came to my home one year ago.Debby couldn't see things after an accident.Evie is a guide dog for her.
W:So it is important for Debby.
M:Yes.Evie is much more than a dog.It is also Debby's best friend.