题目内容：

Guide dogs enjoy their work very much, and they get a lot of satisfaction from a job well done, but there is no room for typical dog fun during the work day. Games, treats and praise distract the dog from helping its handler navigate (指引方向)  the course. Even when the handler doesn’t need assistance, a guide dog on the job is trained to ignore distractions and keep still. This is because a guide dog must be able to come to handler’s workplace or be in public places without creating a disturbance(干扰).

When you see a guide dog on the job, it is extremely important that you recognize that it is at work. Petting or talking to the dog spreads its concentration, which weakens the handler’s ability to get around in his or her surroundings. People are very impressed with guide dogs and so we have a natural inclination（倾向）to praise them, but the best thing you can do to help a guide dog is to leave it alone so that it can pay attention to its surroundings and maintain its focus on its handler. Guiding is very complicated, and it requires a dog’s undivided attention.

When a guide dog gets home at the end of the day, however, it will play and soak up praise just like an ordinary pet. Guide dogs make the difference between work and play based on their lead harness（牵狗用的皮带）：When the harness is on, they must stay completely focused---- when it comes off, it’s play time. Guide dogs work very hard every day, but they lead extremely happy lives, full of lots of attention and stimulation.

Working as a guide dog requires good physical and mental shape, so guide dogs typically retire just before they enter old age. Retirement is usually at age 8 or 10; but some work for a little longer, and some guide dogs retire earlier if they’re having trouble with the work.

1.What do you think is the typical job of a guide dog?

A. Help the policemen to search for the murderer.

B. Help the blind or weak-sighted people get around .

C. Help the doctor to save the injured people.

D. Help the owner to watch their house.

2.What does the writer want to tell the readers through the passage?

A. Guide dogs are so helpful that we should make friends with them.

B. Guide dogs are different from other dogs and they have some special talents.

C. Guide dogs’ life style and job situation.

D. Guide dogs’ trained way by their handlers.

3.What does the underlined word “distract” mean in the passage?

A. to stop the dog paying attention to what he is doing

B. to make the dog think very carefully about what he is doing

C. to interrupt the dog so that he cannot do the work well

D. to stop the dog from doing something

4.What should you do when meeting with a guide dog at its job?

A. Praise it.    B. Feed it.

C. Play with it.    D. Leave it alone.