試題詳解

12
(A) After a few years of trial-and-error, it was decided that certain breeds are better guides than others.
(B) Efforts are made to build mutual understanding and to avoid any misbehavior that might be devastating.
(C) Located in Germany, the school was unusual because it was a school for dogs instead of humans.
(D) This is to get it exposed and accustomed to all kinds of situations it may encounter in the future.