听一段材料，回答下面几个小题。
According to the passage,what were dogs trained for in the past?
A.For protection against other animals.
B.For protection against other dogs.
C.Just for fun.
Why were dogs used for hunting?
A.Because they did not eat other animals.
B.Because they were useful for protection.
C.Because they always obeyed their masters.
What is the most important reason for people in the city to keep dogs now?
A.For companionship.
B.For amusement.
C.For protection against robbery.