B. 根据短文内容,按要求回答问题。
Do you like dogs? Dogs love their owners. Some dogs even help their owners in life. We call them service dogs(服务犬). Some people can't see or hear, so they have those special dogs.
Some service dogs can be the “eyes” of their owners. They guide(引导) their owners when they go out. They help their owners go shopping, visit a friend, or take buses and subways. One service dog Chloe helps her owner Sami a lot. Sami loves to run, and Chloe guides her in the running races in high school.
Some service dogs can also be the “ears” of people with hearing problems. They can let their owners know when the phone rings(响起) or when others call their names. Phyllis, a teacher, can't hear very well. She has a service dog Shadow. When a student calls Phyllis, Shadow touches her with his nose. Then he runs to that student.
Service dogs often wear special clothes. Dogs usually can't go into shops or many other places, but service dogs with special clothes can. Remember! When you see a service dog working for its owner, don't touch or play with it.

21. What is the job of service dogs?
22. How can service dogs help blind people?
23. How does the writer show us that service dogs help people with hearing problems?
24. How can service dogs go into shops?
25. What do you think of service dogs after reading the passage?

21. Their job is to help their owners in life.
22. They can guide their owners when they go out.
23. By telling the story of Phyllis and her service dog Shadow.
24. By wearing special clothes.
25. They are very useful/helpful/smart. (答案不唯一)