“Are you ready to go to work?” a woman asks her dog Sydney. The dog was her tail. Then she starts sniffing around inside the house. Sydney is hunting for mold. When she sits down, that means she smells mold nearby. Usually mold is found within three or four feet. A boy who lives in this house has epileptic attacks. It could be from mold. His mother wanted to find the mold. She tried other ways to find it, but they didn’t work. She said she trusted the dog more than the other ways. Workers found mold near where Sydney sat. Nobody had thought to look for mold there before. Now it can be cleaned out and the boy will feel much better.

　　Sydney is very special. Only about ten animals in the U.S. can do this. She spent hundreds of hours with a police dog trainer in Florida to learn how. In the U.S., people have used dogs to find drugs and bombs for a long time, but dogs that find mold are something new.

　　People in Europe have used mold-sniffing dogs for many years. Dogs are cheaper to use than human trackers and can find exactly where the mold is. They also do it quickly and for less than %500. Other methods may cost thousands of dollars and take many weeks.

　　1.D 2.C 3.B 4.A 5.D